Question about 2006 Buick Rendezvous
Changed thermostat, temp sensor, and bled system. Have some heat but not like it should be. Any ideas?
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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