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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1 Answer

Buick rendezvous overheating


Check the radiator cap first, pressure test the cooling system next,, see where the leak is if you have one,, check the electronic fan switch and relay,, ,,, after that it would be the thermostat, check to see if the upper radiator hose gets hot before it overheats,, if not the thermostat may be stuck shut,,, good luck, and of course be careful if a hose blows or cap is bad you can get scalded by the hot water ,, it can be over 220 * f

Aug 13, 2014 | 2002 Buick Rendezvous

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Buick 2002 rendezvous is overheating. driver side water hose is hot and passenger side water hose is cold. should they be an even temp.


they should be even temp. check for low fluid level in radiator, may even have a bad thermostat. sorry i can't be more specific, is the car overheating at all? is engine fan on when engine at operating temp? is there any fluid leaking into the passenger compartment? if so, please repost your question. thank you for choosing fixya.com

Dec 27, 2010 | 2002 Buick Rendezvous

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My 2002 Buick Rendevous has a hot coolant


Install the new thermostat (make sure it is the right temp). This will allow for your coolant to stay long enough in the radiator to cool down.

If that does not fix it, check radiator cap, belt that turns the water pump and the water pump itself along with its pulley.

There is also the possibility that the coolant temperature sensor is giving off false readings, that the coolant system is clogged or your engine fan is not operating when it should be.

May 03, 2010 | 2002 Buick Rendezvous

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03 Buick Rendezvous Overheating


If the top hose is hot and the bottom is cold, your definitely not getting circulation. You,ve already done alot of work to this vehicle so you have pretty much answered your own question. About the only thing left is the heater core. Of course, I dont want to be the one to tell you it is definitely the heater core because obviously I am not looking at the vehicle. But If i was a betting man, thats where my money would be.

Dec 14, 2009 | 2002 Buick Rendezvous

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Overheating


could be the waterpump

Jul 30, 2009 | 2002 Buick Rendezvous

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Bublling in the thermostat housing and very hot upper radiator hose


I recommend flushing the radiator thoroughly if not done recently. there seems to be some sort of blockage in the radiator at this time. if you get lots of metal fragments that are flushed out during this flush, i will then recommend a rebuild on the radiator or replacement of the radiator. make sure the cooling fans are cycling on time as well.

May 21, 2009 | 2002 Ford Explorer

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Buick rendezvous overheating


This is all getting to be pretty bad when no one listens!?
All Buick Rendezvous overheat! It's a badly designed system with no upper engine compartment ventilation! It's one thing to save on mileage with a hot engine but another when it's so hot it burns out all gaskets and seals everywhere! Counter productive to say to least! People are spending tons of money on repairs that are not necessary!
I bought a 2002 Rendezvous knowing full well that I could fix the overheating problem! I got a good deal on the SUV and bought it knowing it was an easy repair! The previous owner spent a bundle on new head-gaskets and still the overheating problem did not leave! I purchased it knowing full well what the problem "was" !
I did an inspection on the (engine compartment) The engine sits quite high in there and the heat of the engine has no escape from the compartment. It's closed off and the engine sits in it's own heat getting hotter and hotter destroying gaskets and all other heat related injuries ! The cooling fans direct the incoming air to the bottom and out below the problem!
My inspection shows trails where the heat did escape around the upper rubber seal at two ends over the engine compartment.. Those very small openings were the only means of heat escape, but not nearly enough! The heat there was so intense it started bubbling and blistering the paint on the hood! That was all the information I needed to be confident in the purchase of this 2002 Buick Rendezvous!
After the purchase I cut the rubber seal down away from the hood at least one inch by two feet from center...NOTE! I was also careful not to remove the guard area for rain water. The lower section of the rubber guard takes care of that. For a test to be sure I sprayed water over the windshield and not a drop spilled onto the engine.....
Well it's been two years and not one over-heating problem since...... I have photos on the work done if you like......

Mar 25, 2009 | 2002 Buick Rendezvous

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