It's possible that they can cause coolant to leak, yes. If you don't trust the mechanic's diagnosis you may want to try another mechanic before paying out the money though?
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April, 29, 2009 AT 9:47 PM
Wow, sounds cheap. I just had my intake manifold gasket replaced for $1k at the dealer (gasket only).
Yes, this can cause coolant to leak into the crankcase (check your oil and see if it is a 'chocolate milk' like consistency or perhaps frothy or foamy on top. This indicates coolant in the crankcase and suggests a head gasket or intake manifold gasket problem. I have been told that the GM V-6 3.4 liter engine has problems with intake manifold gaskets.
July, 13, 2009 AT 10:38 PM
I have 3 of these pieces of crap vans in the family. All three of them have had the same problem with the intake gaskets leaking anti-freeze into the crank case. As I am writing this post, I have number 3 sitting in my garage replacing the intake. I had a shop replace the first 2 at a price of 700.00 dollars for the gaskets only, so I have time now to do it myself and save me some money. I replacement gasket kit only cost about 100.00 dollars and the rest is labor. Turned in my last 2 repair bills to dex-cool settle back in Aug 2008, and still have not received any monies back from the settlement due to GMC filing bankripcey. No that is not a type error because that is what gmc did, rip the consumer off with this piece of crap, faulty, I will be looking for a new car here shortly and my family has alway stood behind chevy. GMC, for as long as I can remember. I think my next purchase is going to be Saturn, Kia, or Toyota. I can't believe that American auto makers are putting this type of junk on the showroom floor and asking people to buy these cars, what a sad state our auto companies have become. And to think my dad worked for this company for 40 years.