Question about 2006 Buick Rendezvous

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Temp guage running low. Only about 1/4 when it shoud be about 1/2???

Changed thermostat, temp sensor, and bled system. Have some heat but not like it should be. Any ideas?

Posted by jeffrey huseman on

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Jeff Armer

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  • Buick Master
  • 15,575 Answers

Before you replaced parts did you feel the upper radiator hose ,as close to the engine as possible , From a cold start you would be able to tell if thermostat was opening ,by change in temp ! Check heater hose's going through the fire wall to inside vehicle . When vehicle is warmed up are both hose's hot to the touch ? I would suspects the temp . gauge before the coolant temp. sensor , Because I know GM has had problems with the stepper motors that control the gauges .
The instrument panel cluster (IPC) displays the engine coolant temperature (ECT) as determined by the engine control module (ECM) or the powertrain control module (PCM). The IPC receives a class 2 message from the ECM/PCM indicating the ECT. The range on the ECT gage is between 60-125?°C (140-260?°F). The ECT gage defaults to 60?°C (140?°F) or below if the ECM/PCM detects a malfunction in the ECT sensor circuit. Refer to Cooling System Description and Operation.
Class 2 is a serial data communication network ,found on GM vehicles , Vehicle computers share information on this network .
How's the antifreeze ? does the vehicle still have the original dex-cool antifreeze ? You haven't change the coolant with green coolant ? Dex-cool an regular green coolant don't mix , they gel up clogging heater cores ,passages in the engine block etc...

Posted on Jan 11, 2016

Testimonial: "Thanks Jeff..I did said things in your answer and to no avail. Did use dexcool. There was no green antifreeze in it at all. I think I'm going to flush the system and see if that does anything. If not, I will take it down the street to my mechanic. I was just trying some things because he is always so busy because he is good and honest. Thanks again for your answer and God Bless"

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