Thermostat
Asked by Dyer12 Feb 26, 2018 at 07:22 PM about the 2005 Chevrolet Impala FWD
Question type: Maintenance & Repair
I have an 05 Chevy Impala and about 3
months ago we had a problem with the
gage in the dash reading hot and a red
light coming on. We have replaced the
raiditor as well as the thermostat 3x and
the water pump as well as all the hoses.
The gage in the dash will still read hot and
the red light comes on after fixing that.
What else could be the problem? And yes
everything was bleed and there is no air in
the system.
4 Answers
Does the engine actually feel like it's running hot? Are the cooling fans kicking on? If you put the AC on, does at least one fan turn on? (I'm being lazy and didn't look up if you have one or two fans on this model.) If no fans are turning on, look at any fan relays or a fan control module. The system likely has an "engine coolant temperature sensor" (ECT) that provides input to the engine's computer, which decides when to turn the fans on. A bad ECT can prevent fans turning on. In many models, there are TWO coolant temp sensors, with the other one being just a sending unit for the dash gauge. So you could have a working gauge but still a non-working ECT for the computer.
Both fan turn on and run. And no it doesn’t act like it’s running hot. No steam and it does not try to die when the gage in the dash turns on.
Try testing the coolant temp sending unit - for that you would need a meter. Do a web search for a how-to.
