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Hello forum, I have a cooling problem with my 2006 ZO6 that my local Chevy dealer hasn't fixed.
On a normal drive last week I noticed a " engine hot, air conditioner turned off " on my display. I went home and before I shut the engine off I noticed that the electric fan wasn't on. When I shut the engine off and attempted to turn it back on, it would not start. Had it flat bedded to my local Chevy dealer. They checked it out and said it was my water temp sensor and replaced it. I took it out today and same message came up on display.
Can anyone help with a similar problem and what the culprit actually was?
Thanks
What was your coolant temperature while this was going on? I f your engine overheated, it could be several things. Like you said, "fan not working", stuck thermostat, bad water pump, low coolant level due to some reason, something blocking your radiator, etc. Again, what was your coolant temperature?
What was your coolant temperature while this was going on? I f your engine overheated, it could be several things. Like you said, "fan not working", stuck thermostat, bad water pump, low coolant level due to some reason, something blocking your radiator, etc. Again, what was your coolant temperature?
The engine cooling fan is a variable speed fan. The engine control module (ECM) controls the fan speed by sending a pulse width modulated signal to the cooling fan speed control module. The cooling fan control module varies the voltage drop across the engine cooling fan motor in relation to the pulse width modulated signal. The cooling fan speed is affected by many different conditions and can be adjusted from 10–90 percent duty cycle. Ninety percent is considered high fan speed. When multiple cooling speed requests are received, the ECM uses the highest cooling fan speed of all the requests. During normal fan ON operation, the control circuit voltage will be low and near battery voltage when the fan is OFF.
Tests/Procedures: 1. Check coolant temperature on the scanner in Powertrain Control Module (PCM) data.
2. Check duty cycle at the Powertrain Control Module (PCM) Black connector, Green wire, pin 58 backprobed.
3. At 235 degrees F, the duty cycle should be near 90% and the fan should be on high.
Need help with cooling system on ZO6
