Truck randomly overheats, becoming more frequent.
Truck has appropriate level of coolant(mostly water at this point)
when truck is starting to over heat and I turn on the heater it will sometimes blow cold air and the truck will continue to overheat .If I toggle the air and or temp controls sometimes the air will heat up and the temp will return to normal.
when the temperature rises to overheat I can shut off the truck and restart in a few minutes and the temperature will drop back to normal before the system has had a chance to cool.
I feel that the issue may be an air lock ,sensor or control valve. I have also changed the thermostat- no change.
sometimes I hear a hum like a fluid restriction under the hood near the firewall in the vicinity of the heater and control area.
Any advice would be greatly appreciated.
Truck has appropriate level of coolant(mostly water at this point)
when truck is starting to over heat and I turn on the heater it will sometimes blow cold air and the truck will continue to overheat .If I toggle the air and or temp controls sometimes the air will heat up and the temp will return to normal.
when the temperature rises to overheat I can shut off the truck and restart in a few minutes and the temperature will drop back to normal before the system has had a chance to cool.
I feel that the issue may be an air lock ,sensor or control valve. I have also changed the thermostat- no change.
sometimes I hear a hum like a fluid restriction under the hood near the firewall in the vicinity of the heater and control area.
Any advice would be greatly appreciated.
May 19, 2019 at 9:30 PM
