08 Chevy Equinox Occasional overheating & loud vacuum like sound when shut off
#11
Stop guessing. Get a test kit. Or measure your cylinder compression.
https://www.youtube.com/watch?v=v0U8Iyf0kk4
https://www.youtube.com/watch?v=v0U8Iyf0kk4
#12
The only place on an engine where exhaust and coolant get close and can intermix is at the head gasket.
If you see bubbles under the rad cap it's a sure sign. Why don't you try the tester kit first. It's only about $40.
If you see bubbles under the rad cap it's a sure sign. Why don't you try the tester kit first. It's only about $40.
#13
So, just to be clear, no oil/coolant mixing, no obvious leaks while the car is running anywhere in the engine bay, no white smoke from the exhaust, but coolant smell in the engine bay and the outside of the car, plus the exhaust smell, all means head gasket and not intake manifold? No rough idle, no check engine light, just overheating and mysterious losing coolant? Don't get me wrong the head gasket is easier to replace so i an fine is that's the case i just want to be sure! I am pretty handy at fixing stuff but don't have much experience diagnosing.
Just like you, I had no obvious symptoms of a head gasket failure. The exhaust looked fine. Oil wasn't mixing with the coolant. The engine wasn't overheating. The only symptoms I had was that the coolant started having a cloudy, finely aerated appearance and it would barely bubble out of the overflow hose on the reservoir. Coolant would bubble out if I removed the cap even after sitting for a few hours and cooling off. At first, I thought I just needed to bleed the cooling system because these are notoriously difficult to bleed without vacuum filling them. However, after a few weeks of cracking the bleeder screw after I drove it, I came out to the garage one morning to find a small puddle of coolant under the driver's side. Further inspection revealed it was from the overflow tube. realized that a head gasket had probably failed, because I could never seem to bleed all the air out of it. I limped the vehicle this way for a month or so before having the head gaskets done. I would just crack the bleeder screw to relieve the pressure between drive cycles.
If you choose to do this job yourself be sure to have the heads checked by a machine shop before reinstalling them or just install remanufactured heads like I did. The reman heads only cost another $100 compared to having a machine shop go through them and risk being back at square one after paying them anyways.
Last edited by ruley73; March 21st, 2024 at 5:28 AM.
Thread
Thread Starter
Forum
Replies
Last Post
kountrygal318
Equinox & Terrain
3
June 15th, 2015 1:03 AM