Question about Buick Rendezvous
The thermostat is one of the things that could cause this problem. Here are some other things:
-The cooling fans-If they are not coming on at the correct time or not at all then they could cause an overheating problem.
-Cooling system leak-If there is a leak in your system then you would be losing coolant which would make your car overheat.
-Shrouds missing-If your shrouds and air dams are missing or not attached correclty they could cause this type of problem.
-Bad Head gasket-this would cause all of the problems that you are having.
These are the most common causes of this type of problem. I would recommend taking it to a reputable repair shop and having them do a "pressure test" on your system, this will show if you have any leaks. The I would have them check out the cooling fans to be sure that they are working properly.
Note - if that coolant if full and that fan is running.9 times out of 10 there is a bad head gasket allowing some compression to get into the coolant system and cavitating the coolant.since the coolant system max is 15 PSI the compression is more psi than 15 and it will actually slow down or stop the coolant flow threw the engine and cause this.its usually the rear head gasket that does this.but always change both head gaskets when its apart.
Let me know,if needed further assistance.
Hope i helped you.
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Posted on May 21, 2011
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Posted on Jan 02, 2017
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