Question about 2002 Buick Rendezvous

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I have a 2004 Buick Rendezvous that runs hot. Replaced the thermostat, manifold gasket, radiator, had the fans checked and still runs hot. What else could be the problem?

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  • 1,702 Answers

Cylinder head gaskets, or cracked cylinder heads, this is a bad problem with the 3400 engine, so bad that we keep a set of heads in stock at the shop.....SORRY

Posted on Nov 14, 2010

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2004 buick tendezvous overheating problems


have a compression test done for head gasket or cracked head
check that the fans are coming on if electric
replace the viscous fan hub ( fan clutch ) if fitted
check the fin condition of the radiator --if they flake off easily , get a new radiator
check coolant level in the radiator at the cap
check cap for operation
if radiator work was done check for air lock in system
run fault codes to check for over fueling and ignition timing problems
if the radiator is old , have a flow test done to check for blocked cores

Oct 22, 2015 | 2004 Buick Rendezvous

1 Answer

2002 buick rendezvous running hot. Water pump change thermostat change 1s the fans were running unplugged that now was told to try temp cooling sensor. Can u help me


Check the radiator isn't, blocked ,then check head gaskets for leaks by putting compressed air in the cylinders and see if bubbles come into the radiator with the cap off.

Aug 21, 2015 | Buick Rendezvous Cars & Trucks

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

2 Answers

Over heating and blowing cold air from heater


Possibly leaking head gasket. Easiest way to check would be to fill radiator full, start engine and watch coolant level in the radiator cap opening. The top radiator hose will become hot when thermostat begins to allow coolant flow through the radiator. You may have to top off the coolant. Still with the radiator cap off watch for water belching out of the radiator neck. If coolant does belch out of the radiator cap neck, refill with water. If it belches out coolant again it would be combustion gassed forcing the coolant out of the radiator.


This process should take about 1/2 hour to diagnose if it is a head gasket leaking combustion gasses into the coolant.


The radiator fan may run once car is shut off to cool engine compartment to prevent gasoline in fuel lines from vaporizing which would cause a condition called "vapor lock". A car won't start if fuel lines are vapor locked.

Good luck, I hope this helps you to figure out the problem.

Apr 17, 2014 | 2005 Buick Rendezvous

1 Answer

My 2004 buick renzdebous is heating up


Should be under the housing where the upper radiator hose connects to the intake.
You should first make sure the radiator is full and the fan is coming on at 220 degrees.

Sep 25, 2012 | 2004 Buick Rendezvous

2 Answers

My truck keeps running hot. We change water pump, fuel pump, alternor, new belt, coolant temp sensor, and fan relay. Also A/C is not working so the fans wont come on. Is it another sensor in the truck...


Try connecting your fans directly to the battery to know if they are working. If they don't replace your fans. If they are ok, then change the thermostat.
Try this:
When engine cold, remove radiator cap, then fill the radiator with water and start the engine. If water jumps out of the radiator and continues going out as the engine warms up, then you have a bad head gasket and that's why is running hot.

Jun 29, 2011 | 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

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