tpnotch420 Posted December 20, 2008 Share Posted December 20, 2008 the other day my wife was warming up her car and we noticed the temperature gage was in the red so I thought it was the thermostat or water pump. Once the car is moving it drops down to normal. It only seems to run hot when the car is running but not moving for an extended period of time say 20 minutes or so. It runs hot in park or drive. the other symptom is when the car is running but not moving the heater blows cold air this happens weather the car is in park or drive. I can't seem to figure this out has anyone seen this before any help would be greatly appreciated Quote Link to comment Share on other sites More sharing options...
tpnotch420 Posted December 20, 2008 Author Share Posted December 20, 2008 Thanks I didn't think to check the fan I will look at that, but do you think that would effect the heater as well? that's what has me really stuck Quote Link to comment Share on other sites More sharing options...
George_Jetson Posted December 20, 2008 Share Posted December 20, 2008 There is a shutoff valve for the heater core, located on the firewall. Have someone cycle the heater from hot to cold, check to see if the valve is moving. Did you notice the heater problem at the same time as the overheating? Quote Link to comment Share on other sites More sharing options...
tpnotch420 Posted December 20, 2008 Author Share Posted December 20, 2008 It seems as thought the she noticed the heat a day or so later. I did check the radiator fans and they are not spinning it seems as though the relays fan #2 and #3 need to be replaced. I will cycle the heat and check the heater valve. I aslo read somewhere that if my coolant level is low, which it probably is after over heating, that would effect my heater output can anyone confirm this? Quote Link to comment Share on other sites More sharing options...
tpnotch420 Posted December 20, 2008 Author Share Posted December 20, 2008 okay so I topped off the coolant and the heater is now functioning properly.next I need to replace the relays for fan #2 and #3 just wondering if it could be something else that I should be looking at if it's not the relay. is there a temperature sensor that sends a signal to turn the fans on and off Quote Link to comment Share on other sites More sharing options...
George_Jetson Posted December 20, 2008 Share Posted December 20, 2008 Yes by all means check the sensors first. very good possibility that the sensor is bad. There are two sensors, one is located on the lower protion of the radiator (next to the rad hose). The second is located between the cylinder banks, where the upper rad hose hooks onto the engine. Quote Link to comment Share on other sites More sharing options...
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