Question about 2002 Buick Rendezvous

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Fix an overheating buick rendezvous 2002. Truly overheated once, then had the radiator flushed and replaced, along with thermostat (twice) and water pump. Now, the computer indicates it is overheating

Truly overheated once, then had the radiator flushed and replaced, along with thermostat (twice) and water pump. Now, the computer indicates it is overheating, but it actually isn't! Because the overheating sensor on the computer comes on, i cannot drive more than 20mph. Please help!

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You have a needle in a haystack because so many things can cause your problem. I am leaning toward the main computer - which you can replace yourself for around $300. There are companies on the internet that will send you your pre-programmed computer, you have to supply your VIN number. Like many internet companies I always recommend that you are careful in your selection. Be careful to find a reliable company and call them on the phone to make sure they are a real company. If they do not have a phone number - find a different company.

Here are a couple things to try first:
1) Coolant sensor - but this usually makes your car run really poor because it can change the gas/air ratio. If your car is running great other than the overheating sensor - then this probably is not the problem. But worth checking.

2) Serpentine Belt - sometimes when you change the serpentine belt you can put it back on the pulleys out of order. Your car can run great but can cause overheating especially if you have the water pump turning backwards. Since you had the water pump changed you might just take a look at the belt to make sure it is wound correctly. There should be a sticker under the hood.

All said -- I am still leaning toward the main computer.

Posted on Nov 28, 2014

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Before I replaced the computer, I'd make sure the coolant pump was working. I've replaced coolant pumps in older vehicles that had no blades left on the impeller. Also, make sure your cooling fans are coming on and that your thermostat is not installed backwards.

Posted on Nov 30, 2014

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Replace the coolant temperature sensor.

Posted on Nov 28, 2014

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You need to do a diagnostic scan as soon as the 'overheating' light comes on. This should give the mechanic a place to start with his troubleshooting. Sounds to me like the coolant sensor(s) were damaged when your vehicle overheated.

Posted on Nov 28, 2014

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Over heating may damage the coolant temperature sensor and cause the light to come on. when the sensor fails the engine is slow to start and there is a strong odor of gasoline. turn it off and it starts normal the second time.

Posted on Nov 28, 2014

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