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2003 Deville - cooling system problems

3850 Views 34 Replies 5 Participants Last post by  20grand
I have to do this on my Deville in the AM. It drives and rides nice but after a while at idle the gauge will increase and cold air kicks through the vents. After I rev the rpms real high, the gauge comes back down and then I have heat. I also checked the tank and she's nice and full. Was thinking maybe a faulty thermostat but will check the lines before I pull that out.
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A little bit of grease on the friction points on the tool will make it easier to turn.
Just drive it normally and check it in a few days.
It maxed out? If the water pump is spinning and the purge line is clear, it's time for a block test.
If you can see the pump pulley turning, it's doing its job.

Did you do the block test after an overheat?
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