Last post on Jan 09, 2011 at 3:18 PM
You are in the Chevy Venture
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Chevrolet Uplander, Pontiac Montana, Oldsmobile Silhouette, Van
#1 of 8 2002 Chevy Venture 3.4L Coolant Leak
Jan 12, 2010 (12:44 pm)
2002 Chevy Venture with the 3.4L V-6, w/about 105k miles with a coolant leak.
History: In winter 2006, with about 45k miles, we noticed a coolant leak and took it in to the shop. They thought it was the intake manifold gasket and replaced it. Got the car back and it was still leaking. Took it back and they found it was the head gasket. They replaced the head gasket and pretty much compensated us for the intake manifold gasket, so we paid about $2100 total (which is their price just for head gasket).
Now, with 105k miles, we are noticing another coolant leak and it seems to be getting worse (along with an oil leak, which I can deal with). I looked underneath hoping it was coming from the radiator, but no such luck. Looks like it's coming from the engine area, which leads me to believe head gasket again. Any other possibilities? I guess I need to call the shop that did the work and see if it is covered? Any chance that GM has a recall or something like that for this vehicle right now?
I hate to spend another $2k plus, but we don't really want to spend money for another new or 1-2 yo vehicle right now.
#2 of 8 Re: 2002 Chevy Venture 3.4L Coolant Leak [neustkg]
Feb 07, 2010 (1:16 pm)
You don't say where it looks like its coming from...if you can see where its coming from its a lot easier to help you guess what it is.
about 105k it could be the water pump...
#3 of 8 Re: 2002 Chevy Venture 3.4L Coolant Leak [442dude]
Feb 07, 2010 (2:08 pm)
Sorry, I didn't update. Turned out to be the lower intake manifold gaskets. Had all the gaskets replaced by dealer and leak stopped. Also replaced thermostat. Was hoping it was water pump. Prob. would have been cheaper.
#5 of 8 2001 chevy malibu w/ 2001 chevy venture 3.4l in it
Sep 30, 2010 (12:00 pm)
Hey everyone, im hoping i could get a little insight on a car im working on. I purchased the car and the seller told me it had started overheating and acting like the head gasket was starting to go bad but not blown, there was never any oil-coolant contamination, and he gave me the full gasket set for the engine with the car. I drove the car home, had to stop twice to add coolant because it was all pouring out the coolant overflow, and then tore the engine down. The head gaskets did not look that bad, the lower intake gaskets looked ok, and the upper intake gaskets looked like crap. I replaced all of them since i had them, also replaced the following, spark plugs (gapped .060), plug wires, thermostat, coolant resevoir lid, power steering pump, valve cover gaskets, pcv valve, throttle body gaskets, exhaust manifold gaskets and bolts, fuel injector o-rings, air filter, and oil/ oil filter. After i did all this i put the engine back together and started it up, it started right up but is not idling smooth and also is still spitting all the coolant back out the overflow. Ive flushed the system and burped it 3 times for 45 minutes each time and it still does it. I also ran a compression test and got 130psi from 5 cylinders and 120psi on the #5 cylinder those numbers sound low but im not sure what they are supposed to read. Also the small vacuum tube connected to the pcv valve is collapsing when the engine is idling and the engine seems like its stalling out. Ive had suggestions that the heads where warped and now i need to redo the head gaskets, the heater core is bad, something is wrong in the vacuum system, and the water pump is bad. So with all this info can anyone tell me what it sounds like im hoping i dont need to redo the head gaskets but that looks like where its heading. Thank you to anyone that helps.
#6 of 8 01 montana intake gaskets
Jan 09, 2011 (11:04 am)
Hi, I've recently had the intake gaskets replaced, 200,000 kms/162,000 miles. I was smelling the coolant in the cab and could see some leaking on the engine. Works great, like new except there is a reduction of fuel mileage from 33-34mpg to 29-30. Mechanic does not have any ideas.
Anyone out there encounter same?
#7 of 8 Re: 01 montana intake gaskets [willy30]
Jan 09, 2011 (11:21 am)
Wow! How were you getting 33-34mpg? At best on the highway we got something like 30-31mpg but that was when we were keeping the speed between 65-70mph. We drive across Wyoming and Idaho once a year and since the speed limit is 75, we keep it between 75-79 and get an average of about 27-28mpg (which makes sense due to the higher speeds) depending on the wind. You pretty much have to drive at least 75 or you get ran over by semis (hypermilers would be in danger on these highways).
#8 of 8 Re: 01 montana intake gaskets [neustkg]
Jan 09, 2011 (3:18 pm)
I have to clarify that I was doing 60 mph most of the time, on repeated long trips and this is in Imperial gallons, which are larger than U.S. Gals., also using nothing but Shell gasoline. Alas I can't seem to recover my former fuel mileage.