3.5 Coolant crossover tube - Pontiac G6 Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 24 (permalink) Old 09-16-2012, 03:08 PM Thread Starter
Junior Member
 
Join Date: Sep 2012
Posts: 22
 
3.5 Coolant crossover tube

Can somebody help me? I am tracing a coolant leak on my 07 G6 V6 and I don't know where the crossover tube is located to see if it is the problem. The leak seems to be coming from the rear head gasket at the passenger side corner, but I don't know if the crossover could be leaking and running down to that area from above somewhere. Can anybody tell me where to check the crossover tube to see if that gasket is leaking?
Thanks, Pat
ph71ss is offline  
Sponsored Links
Advertisement
 
post #2 of 24 (permalink) Old 09-16-2012, 03:56 PM
OOBER SUPER MEMBER
 
Join Date: Jul 2011
Posts: 2,388
 
It's highly likely the crossover pipe gasket is the issue. They all fail eventually on the 07 3.5l. The replacement gasket is much improved. Has your powertrain warranty expired?

This may help:

http://www.autoserviceprofessional.c...crossover-leak

Last edited by greenman; 09-16-2012 at 11:20 PM.
greenman is offline  
post #3 of 24 (permalink) Old 09-16-2012, 05:01 PM Thread Starter
Junior Member
 
Join Date: Sep 2012
Posts: 22
 
Yes I ran out of time on the 5yr. warranty. Sucks because it only has 55000 miles on it. Everyone says the crossover tube gasket is a major problem. I am just trying to find help in locating where it is on the engine so I can verify the problem or rule it out
ph71ss is offline  
post #4 of 24 (permalink) Old 09-16-2012, 05:33 PM
OOBER SUPER MEMBER
 
Join Date: Jul 2011
Posts: 2,388
 
Best I can do:

http://www.g6ownersclub.com/forum/at...1&d=1347838360
Attached Thumbnails
Click image for larger version

Name:	07coolantcrossoverpipe.png
Views:	26917
Size:	38.5 KB
ID:	3473  
greenman is offline  
post #5 of 24 (permalink) Old 09-16-2012, 05:57 PM
Senior Member
 
Metalhead852's Avatar
 
Join Date: Aug 2010
Location: Lima, OH
Age: 31
Posts: 163
 
The problem stems from GMs RA finish when they mill the block and heads.

Lima... where the men outnumber the women and the women outweigh the men.
Metalhead852 is offline  
post #6 of 24 (permalink) Old 09-16-2012, 06:24 PM Thread Starter
Junior Member
 
Join Date: Sep 2012
Posts: 22
 
Thank you, GREENMAN. I was looking for a tube of some kind, didn't realize it was basically the whole front of the engine from one head to the other. Now I am even more convinced it is the head gasket because I saw no evidence of anything leaking on the front of engine. Thanks again
ph71ss is offline  
post #7 of 24 (permalink) Old 09-16-2012, 07:33 PM
OOBER SUPER MEMBER
 
Join Date: Jul 2011
Posts: 2,388
 
You might try fluorescent coolant dye & a blacklight (Walmart used to sell them for 10 bucks) to localize it.
greenman is offline  
post #8 of 24 (permalink) Old 09-28-2012, 03:56 PM Thread Starter
Junior Member
 
Join Date: Sep 2012
Posts: 22
 
crossover leak

Thanks for all your responses Greenman. Took it to a local shop that I trust and got a quote of $1475 for both head gaskets and crossover gaskets. My question is if the crossover gaskets were leaking, wher would I find the evidence? What I mean is where would I look for the coolant to be running down and could it leak down and run down on the block deck where it meets the head on the rear head? The more I read about this issue it seems the crossover problem is more prevalent than the head gasket problem. Do you have any more info that could help me determine the problem? By the way, there is no oil water mixing in either the coolant or the oil. Again thanks for all your help, Pat

Last edited by ph71ss; 09-28-2012 at 03:58 PM. Reason: left info out
ph71ss is offline  
post #9 of 24 (permalink) Old 09-28-2012, 05:03 PM
OOBER SUPER MEMBER
 
Join Date: Jul 2011
Posts: 2,388
 
Why exactly do they want to replace the head gaskets? The crossover gasket leak is very common on that engine. The gaskets fracture with age but the fracture could be anywhere & there could be multiple fractures. Considering the low mileage, I would contact GM customer service & try to work out a deal with them. They often do deals on known issues if the customer is persistent enough & "reminds" them that it's a well-known common fault on the LZ4.

If that shop put dye in it you should be able to see where the leak is using any blacklight at night.

_____________________________________________

Service Information 2007 Pontiac G6 | G6 (VIN Z) Service Manual | Document ID: 2134019
--------------------------------------------------------------------------------

#07-06-02-006A: Coolant Leaking From Engine (Replace Coolant Crossover Pipe Gaskets) - (May 12, 2008)


Subject: Coolant Leaking from Engine (Replace Coolant Crossover Pipe Gaskets)


Models: 2006-2007 Buick Terraza

2006-2007 Chevrolet Impala, Malibu, Monte Carlo, Uplander

2006-2007 Pontiac G6, Montana SV6

2006-2007 Saturn Relay

2007 Saturn AURA

with 3.5L or 3.9L Engine (VINs N, K, I, R, W -- RPOs LZ4, LZE, LZ9, LZ8, LGD)




--------------------------------------------------------------------------------

This bulletin is being revised to update the labor code in the Warranty Information section. Please discard Corporate Bulletin Number 07-06-02-006 (Section 06 -- Engine).


--------------------------------------------------------------------------------

Condition
Some customers may comment on coolant leaking from the engine.

Cause
The gasket located between the coolant crossover pipe and the front of the right (rear side) cylinder head may be leaking.

Correction
Replace the coolant crossover pipe gaskets with current service replacement gaskets, P/Ns 12577704 and 12590668. Before installing the new gaskets, make sure that the mating surfaces on the crossover manifold and cylinder head are completely clean and that NO OIL or OIL RESIDUE exists.

Parts Information
Part Number
Description
Qty

12577704
Gasket, Coolant Crossover Pipe
1

12590668
Gasket, Coolant Crossover Pipe
1
greenman is offline  
post #10 of 24 (permalink) Old 09-29-2012, 07:14 AM Thread Starter
Junior Member
 
Join Date: Sep 2012
Posts: 22
 
Well I just asked them for a price So far I have been the only one to diagnose it that is why I am trying to nail it down so if I take it somewhere I know what I'm getting and not being charged for stuff I don't need. They( the dealership) got me a couple of yrs. ago on the brake light problem when they replaced the switch and a day later I had the same problem. Took it back and they claimed the new switch was faulty( doubt it ) since now seeing the info on the cbm plug being corroded being a related problem. Going to either pressure test or dye test it today to try and nail it down. Again, Thanks for the help.
ph71ss is offline  
post #11 of 24 (permalink) Old 10-02-2012, 02:52 PM
07 SILVER GT CONVERTIBLE
 
Reg Beckett's Avatar
 
Join Date: Feb 2010
Location: Carstairs Alberta Canada
Posts: 121
Blog Entries: 1
 
I had the same issue on my G6 this spring,just before driving to Arizona.Dealership here said it was head gaskets so went ahead with repair.Mean while my nephew(GM Mechanic at a different dealership)phoned and told about crossover gaskets.Said it was a very common repair on the 3.5 and 3.9 engine.I quickly phoned my dealership but alas was to late,heads were off gaskets were being done.Cost me 2600 canukabucks for repairs.Bad news I'm not sure if I got clipped or not,suspicious but no proof.Good news no more leak,drive AZ was trouble free and the front motor crank seal was replaced as well.So my friend check it out well before hand,keep your costs down

2007 GT CONVERTIBLE 3.9, CRABS 3 c/w FPU,RACINGLINE STB,PAINTED CALIPERS,CROSS DRILLED ROTORS,PAINTED ENGINE COVER RECESSED LOWER GRILLS,CARAID INTERIOR TRIM KIT,PERIPHERAL iPHONE STREAMING AUDIO,GTR EXHAUST,RACINGLINE MMI(STREET)

Reg Beckett is offline  
post #12 of 24 (permalink) Old 10-02-2012, 04:30 PM
OOBER SUPER MEMBER
 
Join Date: Jul 2011
Posts: 2,388
 
Quote:
Originally Posted by ph71ss View Post
They( the dealership) got me a couple of yrs. ago on the brake light problem when they replaced the switch and a day later I had the same problem. Took it back and they claimed the new switch was faulty( doubt it ) since now seeing the info on the cbm plug being corroded being a related problem.
The first bulletin was issued June 25 2009. After that point there was no excuse to not attempt the BCM connector fix first.
______________________


Service Information 2009 Pontiac G6 | G6 (VIN Z) Service Manual | Document ID: 2294853
--------------------------------------------------------------------------------

#08-05-22-009A: Intermittently Brake Lights (Stop Lamps) Do Not Function Correctly, Extended Travel to Shift Out of Park, Cruise Control Inoperative, DTC C0161/C0277 Set (Perform Repair as Outlined) - (Jun 25, 2009)


Subject: Intermittently Brake Lights (Stop Lamps) Do Not Function Correctly, Extended Travel to Shift Out of Park, Cruise Control Inoperative, DTCs C0161/C0277 Set (Perform Repair as Outlined)


Models: 2004-2007 Chevrolet Malibu, Malibu Maxx

2008 Chevrolet Malibu Classic

2005-2009 Pontiac G6

2007-2009 Saturn AURA




--------------------------------------------------------------------------------

This bulletin is being revised to shorten the required procedure and revise the Warranty Information. Please discard Corporate Bulletin Number 08-05-22-009 (Section 05 - Brakes).


--------------------------------------------------------------------------------

Condition
Some customers may comment that intermittently the brake lights do not function correctly. Other symptoms may include extended pedal travel required to shift out of PARK, cruise control does not function correctly, and DTC C0161 and/or C0277 may be set.

Cause
The most likely cause of this condition is high resistance due to terminal fretting corrosion in the body control module (BCM) C2 connector (specifically pins C2-18, C2-31 and C2-59).

Correction
DO NOT replace the BCM for this condition. Disconnecting the C2 connector, adding dielectric lubricant and reconnecting the C2 connector per the procedure below will correct the high resistance condition due to terminal fretting corrosion.

Remove the right side front floor console side trim panel to access to the Body Control Module (BCM).
Locate the C2 connector on the BCM.
Unlatch the C2 connector and disconnect the C2 connector from the BCM.
Apply dielectric lubricant (clear gel) GM P/N 12377900 (in Canada, use P/N 10953529), or the equivalent, on the BCM C2 pins (apply with a one-inch nylon bristle brush) on all the C2 connector pins (this will treat the pins against fretting corrosion).
Reconnect the C2 connector back on the BCM and re-latch. Wipe away any access lubricant..
Reinstall the right side front floor console side trim panel.
Using the Tech 2, check that the BPPS ratio is equal to BPPS learned home when the brake pedal is not depressed.
If they are equal, brake lamps should be operating correctly and no further steps are necessary.

If they are not equal, perform the Brake Pedal Position Sensor Calibration procedure in SI to complete the repair.

Check the brake lights for proper operation. If incorrect, refer to SI and perform normal diagnostics.
Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

N9595*
BCM C2 Connector Repair
0.3 hr

* This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.




GM bulletins are intended for use by professional technicians, NOT a ""do-it-yourselfer"". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


2012 General Motors Corporation. All rights reserved.
greenman is offline  
post #13 of 24 (permalink) Old 10-02-2012, 08:08 PM
Senior Member
 
Join Date: Nov 2005
Posts: 422
 
Quote:
Originally Posted by Reg Beckett View Post
I had the same issue on my G6 this spring,just before driving to Arizona.Dealership here said it was head gaskets so went ahead with repair.Mean while my nephew(GM Mechanic at a different dealership)phoned and told about crossover gaskets.Said it was a very common repair on the 3.5 and 3.9 engine.I quickly phoned my dealership but alas was to late,heads were off gaskets were being done.Cost me 2600 canukabucks for repairs.Bad news I'm not sure if I got clipped or not,suspicious but no proof.Good news no more leak,drive AZ was trouble free and the front motor crank seal was replaced as well.So my friend check it out well before hand,keep your costs down
Damn, I replaced my head gaskets twice because the stealership said it was leaking. It was slowing losing coolant. That helped a little but I am still losing coolant. I will check the crossover tube gasket next time.
mrslcom is offline  
post #14 of 24 (permalink) Old 10-02-2012, 09:16 PM
OOBER SUPER MEMBER
 
Join Date: Jul 2011
Posts: 2,388
 
Quote:
Originally Posted by ph71ss View Post
Going to either pressure test or dye test it today to try and nail it down. Again, Thanks for the help.
I would imagine that shop already put some dye in. You just need a cheap black light.
greenman is offline  
post #15 of 24 (permalink) Old 10-03-2012, 08:54 PM Thread Starter
Junior Member
 
Join Date: Sep 2012
Posts: 22
 
Quote:
Originally Posted by Reg Beckett View Post
I had the same issue on my G6 this spring,just before driving to Arizona.Dealership here said it was head gaskets so went ahead with repair.Mean while my nephew(GM Mechanic at a different dealership)phoned and told about crossover gaskets.Said it was a very common repair on the 3.5 and 3.9 engine.I quickly phoned my dealership but alas was to late,heads were off gaskets were being done.Cost me 2600 canukabucks for repairs.Bad news I'm not sure if I got clipped or not,suspicious but no proof.Good news no more leak,drive AZ was trouble free and the front motor crank seal was replaced as well.So my friend check it out well before hand,keep your costs down
Thanks for the info. Finally took it in to the dealership for a diagnosis and they pressure tested the system. They called and said I had a leaking radiator(cost$850) I told them that there had been no evidence of a rad leak and all evidence of the coolant leak was on the sub frame at front(right side) of engine and also on the axle shaft. Also that I could see trace of a line running from the corner of engine where the block meets the head on the rear head right side. They looked again and said no it is the rad. I asked if it was the core or the tank seams and they said they couldn't tell for sure.( how in the hell do you confirm it is a rad leak but you can't tell me what is leaking) Anyway I told them to stop and brought it home. I just pulled the bottom tray off from underneath the rad and there is no evidence of a coolant leak from the rad anywhere. absolutely none.
It is either a head gasket or the crossover tube Gaskets. I guess I'm going to have to keep driving it until it decides to show itself for sure. But I appreciate your response and info
ph71ss is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac G6 Forum > Technical Discussion & Modifications > Problems and Solutions

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac G6 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 3 (0 members and 3 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
06 G6 A/C Orfice Tube carolma69 Problems and Solutions 1 04-24-2012 10:14 AM
Airbox tube Explr1 Powertrain Performance Modifications 101 12-17-2011 01:26 PM
Leaking coolant, coolant recovery tank cap. Dvin211 Problems and Solutions 5 05-20-2010 09:52 AM
GTP indentifying disconnected tube svede1212 Problems and Solutions 2 03-02-2009 04:27 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome