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Comments
It might be a good idea to see if you can get the fan to kick in SOONER, that is, at a lower temperature. Changing the type of sensor could help with this.
Overheating problems can be a devil to diagnose---very challenging for any mechanic.
Sounds like I have a very similar problem with my chevy. Was wondering if you would be able to let me know what you have found out and/or what work you have done to fix the overheating. Any help would be greatly appreciated.
Thanks.
I'm in New Zealand, where we have a lot of Toyota badged RHD Chevy Cavaliers. Everyone said 'don't buy one' but what did I do?? They have a reputation for trouble here and are virtually worthless, and many get broken up for parts when still perfectly ok. I've had a good run with my 96 2.4G for 4 years needing only an alternator, but lately that dreaded engine light has been playing up. For a few weeks when I turned the key on, the gauges all flickered and it made a static type sound. I had to turn the key on and off until it didn't do it and it went fine. Now thats stopped, but now the engine check light only comes on about every 10th time I turn the key, and there's no way it'll run until that light comes up. Once it starts up, no problem on the road, runs smooth and strong, and idles perfect. Looks from other replies that its emissions syetm related, but is any particular sensor likely to be the culprit. Our GM dealers don't want to know about these cars, nor do Toyota dealers, so I'm not sure we can even run the diagnostics.
I then had an issue and lost the serpentine belt. It got hot immediately. Fixed the belt and it was then blowing compression into the cooling system and this caused the water to blow out of the coolant tank. I pulled the head again, milled it again and put it back together with new bolts and gasket. It ran great but still had the compression in the cooling system issue.
I am so good at this by now, it took just 1 hour to pull the head. The head gasket and shim looked great and this was confirmed by my machinest. This was not confirmed but it is my feeling that the current head I have is cracked. Machinest thinks so too. No water leaks to the outside, no water in the oil, no sign of water in the combustion chambers, but compression in the radiator. I then noticed many coolant holes in the head, that open to the block, but the head gasket does not have holes in it to allow the water to pass. This prevents water from circulating from the head to the block as this is a reverse flow cooling system.
I bought a used head. It is guaranteed to not be cracked. In looking at the used head, I can see the V track where the old head gasket allowed water from the head to the block on this head. I have been using FelPro head gaskets. I tried to look at a Victor and GM but no one has that head gasket in stock to compare.
Theory:
The cold water comes from the radiator and enters the head on the passenger side end. It travels to the drivers side and should allow some water to flow down through these steam holes in the head and block. The current FelPro gaskets will not allow this water to pass. The water then gets to the drivers side end of the block, travels down into the block, and then back to the passenger side where it comes to the thermostat. Since the water cannot pass, due to the head gasket not having the holes to allow circulation, steam is being generated in the head as the coolant is not properly circulating to prevent this. I may not have a cracked head. It may be these pockets of steam that are being generated to is causing the pressure in the coolant tank. I am going to go with the used head though to make sure.
Will be pondering this question today. Will also take some photos so I can show what is happening with the head gasket issue. Saying that FelPro screwed up the gasket is something major and I am not yet doing so. At present, I am thinking of a new head gasket, using a gasket punch to open the 18 holes that are not in the new head gasket, and screwing it back together with the newer used head.
Will keep you informed. Your thoughts.
2 weeks ago, there was a large "bang" that seemingly came out of nowhere- right from the engine. All the indicators and lights were normal - so I was pretty surprised. Ever since then, I've had problems with the car failing to start, rapid overheating (at idle the needle is above normal), coolant leakage, and white smoke coming from the exhaust.
Now I know that it's EXTREMELY likely that it's a broken gasket.. But now I've just realized with all the comments that's this is a pretty common problem..
Was I lucky to not have this problem until now? And how much would it cost to repair the damages? Keep in note that I have had to drive around a bit when the needle was in H.. So I think the damage might be pretty high. :sick:
If you didn't actually test for combustion gases but assumed so, then perhaps you have a badly clogged radiator.
Help in Miami....
1996 chevy cavalier, 4cly. 1.6 or 2.2 litre engine.
Thank you for your help
As someone else has already stated, step one buy a block tester, it is a kit that will look for combustion gasses in the cooling system if it fails the test take the head off send it to the machine shop and have it checked for cracks and warpage, once you get it back install it with new head bolts from GM follow the instructions to set the torque angle. Then pressure test the system to make sure you don't have any leaks. Then unplug the cooling fan and crank the car, as it is warming up feel the cores of the radiator and make sure the top and bottom are warming up at the same time, if the bottom is cold take the radiator out and have it rodded out or replace it. If the top is cold, turn the engine off and full it up with more coolant. DON'T LET THE CAR RUN TOO LONG WITH THE FAN UNPLUGED you don't want to over heat it and blow the headgasket again. Make sure you flush the old coolant out and install fresh clean coolant in it and DONOT USE GM SEAL TABS. If the radiator starts to warm up evenly turn the engine off, plug the fan up and start the engine and let it run with a/c off, it will have to get to around 223 degrees before the fan will come on, make sure it does.
What isn't so common is oil in the radiator.
brother and i had the same issue with a 97 sunfire with a replaced motor from a 96 or 07 ..Cav... we changed head gasket because of a bent valve ..its because of snapped timing chain ... it would spill antifreez everywhere after a short drive .. but never at idle ... head scratcher !!... after doin compression checks and the likes ... with no issues !! my brother decided to try yr options ... he cut the upper housing containing the temp senser to accomadate the lower thermastat ..... it held the thermastat no problem ... it does not leak . and not throw liquid !..:-D... "NO issues" yr quote ..lol!!!... thanks again !! :-) .. engineers and their "back flow" issues !? lol