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It very well could be the thermostat. However, did you check the obvious things, like coolant levels and make sure you don't have any air pockets? I had an overheating issue that would manifest after 20 to 40 minutes of running the car, which was due to an air pocket.

Usually if it overheats at idle you check the radiator fans, radiator fins bent or clogged, but I have heard of a bad secondary fan causing this issue when high rpms would make the temp go down. Make sure the fan switches are working properly. I have heard that if you put on the A/C it forces both fans to run, regardless of the temp fan switch on some cars, so that might be a way to bypass the fan switch if the fans don't run.

Here is a thread on Odd Overheating Problem that lists a lot of possible things with a similar problem on other types of cars.

Another thing that I experienced recently. I was seeing higher than normal temperatures on my car and the symptoms were similar to a sticking thermostat, which I had just replaced. What the problem was low coolant levels due to a faulty radiator cap, of all things. I noticed misty steam coming up around the hood at idle after the car had warmed up. Then I saw small amounts of water and coolant at the top of the radiator, but I couldn't find any cracks or leaks anywhere. The replaced radiator cap fixed the issue. My point here is observe and note anything out of the ordinary as a clue to the problem.

Need more details. Have you done any related work recently? When did the problem start? How many miles are on the vehicle? Are there any other clues you can give us or is this all there is?

It very well could be the thermostat. However, did you check the obvious things, like coolant levels and make sure you don't have any air pockets? I had an overheating issue that would manifest after 20 to 40 minutes of running the car, which was due to an air pocket.

Usually if it overheats at idle you check the radiator fans, radiator fins bent or clogged, but I have heard of a bad secondary fan causing this issue when high rpms would make the temp go down. Make sure the fan switches are working properly. I have heard that if you put on the A/C it forces both fans to run, regardless of the temp fan switch on some cars, so that might be a way to bypass the fan switch if the fans don't run.

Here is a thread on Odd Overheating Problem that lists a lot of possible things with a similar problem on other types of cars.

Need more details. Have you done any related work recently? When did the problem start? How many miles are on the vehicle? Are there any other clues you can give us or is this all there is?

It very well could be the thermostat. However, did you check the obvious things, like coolant levels and make sure you don't have any air pockets? I had an overheating issue that would manifest after 20 to 40 minutes of running the car, which was due to an air pocket.

Usually if it overheats at idle you check the radiator fans, radiator fins bent or clogged, but I have heard of a bad secondary fan causing this issue when high rpms would make the temp go down. Make sure the fan switches are working properly. I have heard that if you put on the A/C it forces both fans to run, regardless of the temp fan switch on some cars, so that might be a way to bypass the fan switch if the fans don't run.

Here is a thread on Odd Overheating Problem that lists a lot of possible things with a similar problem on other types of cars.

Another thing that I experienced recently. I was seeing higher than normal temperatures on my car and the symptoms were similar to a sticking thermostat, which I had just replaced. What the problem was low coolant levels due to a faulty radiator cap, of all things. I noticed misty steam coming up around the hood at idle after the car had warmed up. Then I saw small amounts of water and coolant at the top of the radiator, but I couldn't find any cracks or leaks anywhere. The replaced radiator cap fixed the issue. My point here is observe and note anything out of the ordinary as a clue to the problem.

Need more details. Have you done any related work recently? When did the problem start? How many miles are on the vehicle? Are there any other clues you can give us or is this all there is?

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It very well could be the thermostat. However, did you check the obvious things, like coolant levels and make sure you don't have any air pockets? I had an overheating issue that would manifest after 20 to 40 minutes of running the car, which was due to an air pocket.

Usually if it overheats at idle you check the radiator fans, radiator fins bent or clogged, but I have heard of a bad secondary fan causing this issue when high rpms would make the temp go down. Make sure the fan switches are working properly. I have heard that if you put on the A/C it forces both fans to run, regardless of the temp fan switch on some cars, so that might be a way to bypass the fan switch if the fans don't run.

Here is a thread on Odd Overheating Problem that lists a lot of possible things with a similar problem on other types of cars.

Need more details. Have you done any related work recently? When did the problem start? How many miles are on the vehicle? Are there any other clues you can give us or is this all there is?

It very well could be the thermostat. However, did you check the obvious things, like coolant levels and make sure you don't have any air pockets? I had an overheating issue that would manifest after 20 to 40 minutes of running the car, which was due to an air pocket.

Usually if it overheats at idle you check the radiator fans, radiator fins bent or clogged, but I have heard of a bad secondary fan causing this issue when high rpms would make the temp go down. Make sure the fan switches are working properly. I have heard that if you put on the A/C it forces both fans to run, regardless of the temp fan switch on some cars, so that might be a way to bypass the fan switch if the fans don't run.

Need more details. Have you done any related work recently? When did the problem start? How many miles are on the vehicle? Are there any other clues you can give us or is this all there is?

It very well could be the thermostat. However, did you check the obvious things, like coolant levels and make sure you don't have any air pockets? I had an overheating issue that would manifest after 20 to 40 minutes of running the car, which was due to an air pocket.

Usually if it overheats at idle you check the radiator fans, radiator fins bent or clogged, but I have heard of a bad secondary fan causing this issue when high rpms would make the temp go down. Make sure the fan switches are working properly. I have heard that if you put on the A/C it forces both fans to run, regardless of the temp fan switch on some cars, so that might be a way to bypass the fan switch if the fans don't run.

Here is a thread on Odd Overheating Problem that lists a lot of possible things with a similar problem on other types of cars.

Need more details. Have you done any related work recently? When did the problem start? How many miles are on the vehicle? Are there any other clues you can give us or is this all there is?

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It very well could be the thermostat. However, did you check the obvious things, like coolant levels and make sure you don't have any air pockets? I had an overheating issue that would manifest after 20 to 40 minutes of running the car, which was due to an air pocket.

Usually if it overheats at idle you check the radiator fans, radiator fins bent or clogged, but I have heard of a bad secondary fan causing this issue when high rpms would make the temp go down. Make sure the fan switches are working properly. I have heard that if you put on the A/C it forces both fans to run, regardless of the temp fan switch on some cars, so that might be a way to bypass the fan switch if the fans don't run.

Need more details. Have you done any related work recently? When did the problem start? How many miles are on the vehicle? Are there any other clues you can give us or is this all there is?