Question about 2005 Buick Rendezvous

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I have a 2002 Buick Rendezvous that is overheating, then cooling down, then overheating again. It seems that when I'm on the highway it cools, but local streets, it heats up. I've changed the thermostat already but same problem (that is getting worse). Could it be the water pump? Loose electrical?

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I ahd the same issue and just had to bleed the air out of the system. Use the bleeder valve on the top of the intake tube, you cant miss it. Stat your car and open that valvethe air/steam will start to come out. Keep that open until you get coolant flowing out of there and then close it. Took me about 5 min. and heat works fine. Please rate my answer to let me know if that was any help. Thanks

Posted on Dec 19, 2009

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What temperature do you consider as Overheating? The Rendevous is essentially the same as a Pontiac Aztek. Thess vehicles were made in Mexico. All recent vehicles operate at coolant temperatures up to and including 250 degrees F safely. Obviously you have more than one problem! First, was the cooling system purged of all AIR following the Thermostat Replacement? If not, then have this done before any further attempt at diagnosis. There are small brass Bleeder Valves located at strategic points on these vehicles and in plain sight. Second, if there is no AIR in the Cooling System then, and only then, should one proceed to check for Thermostatic Fan controls. The Fans (Yes 2 of them) are controlled by thermostats located at strategic points in the Outlet side of the Cooling System and may be additionally controlled by a Relay actuated by the Air Conditioning when in A/C mode which override the Thermostatic Fan Switch.

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Posted on Nov 19, 2009

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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

1 Answer

2002 Buick Rendezvous no heat and over heated after warming it up for over 30 minutes.


Have a pressure test done on your cooling system, you sound like you could have a leak in your system or your system just needs to have the air bled from it. Check your coolant level also, with air in the system and not enough coolant it will blow cold and cause overheating.

Mar 05, 2014 | 2002 Buick Rendezvous

1 Answer

Heat does not seem to get real warm,could there be a flow restriction some where


Could be the thermostat not opening and closing properly. It could also be a flow problem in the heater core. The Dexcool antifreeze that GM uses in their vehicles can cause a gummy sludge to form in the cooling system, which can cause flow restrictions and overheating. I would suggest changing the thermostat and flushing the cooling system. Use an approved antifreeze other than Dexcool to refill the cooling system to avoid future problems.

Dec 21, 2010 | 2002 Buick Rendezvous

1 Answer

I have the same exact problem, once the 2002 Buick rendezvous gets hot it won't start till it cools down. Forget about any diagnostic codes, Buick dealer told me there is nothing he can find. The fan...


Hi usually the symptoms your having are a result of the oxygen sensor(or lambda sensor for its technical name) being at fault.

now the reason it points to this being at fault is that it only starts working when the engine is near normal temp then if the car wont start till its cooled down then this is because the sensor then stops working when its cooled down so your car will run again until it gets hot,

you need to check where the sensor is located in the exhaust if it comes before the catalytic converter then the chances are its the sensor at fault but if it comes after the cat then it could be the cat that is at fault.

my best guess would be the sensor as your car is playing up exactly as if this sensor was not working.

i hope this is some help to you

let me know if you need further assistance ok

plz rate this solution as i have a whole page of unrated posts, thanks

Sep 16, 2010 | 2002 Buick Rendezvous

1 Answer

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

7 Answers

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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