To determine if the thermostat is bad on a Buick Rendezvous, check for symptoms such as the engine overheating or not reaching its normal operating temperature. You may also notice fluctuating temperature readings on the dashboard gauge or coolant leaks around the thermostat housing. Another test is to feel the upper radiator hose; if it remains cool while the engine is running, the thermostat may be stuck closed. If these signs are present, it’s advisable to replace the thermostat.
might be a bad fuel sender unit or BCM
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To change the refrigerant in a Buick Rendezvous you will need to remove the old freon. Freon is bad for the ozone, so you will need to hook to a special machine and reclaim it. Next you will need to pull a vacuum on the ac syatem, then fill with new freon.
It may be a bad wiper switch
Being a GM product I would suspect the fuel pump is bad.
Could be a bad thermostat or heater core
Could be a bad thermostat or heater core
Low coolant? Radiator dirty or plugged? Bad thermostat? Bad water pump? Cooling fans not working? Bad radiator cap?
It can be a broken wire in the hinge area, a bad switch, or simply a bad window regulator.See this post for instructions on how to diagnose the problem:
Coolant not reaching temp required. Usually it's sign of bad thermostat.
the dash stuff acts like it is possesed, goes on and off, i also heard a clicking noise like it was resetting