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There is a couple of things you can try. 1. Check all connectors to and from the fan and thermostat. 2. Check your fuses. 3. Check there is power going to the connector to the fan with a multi-meter.
If this fails contact an auto electrician for further assistance. I hope this helps.
The heater is NOT actuated by a fuse, the fan is. ]But if the fan blows, the electrical part is OK, then it must be the heater door that switches from the cold air to the hot one, or 2) the heater core is not receiving enough hot coolant.
Look to make sure both ac fuse and relay are good and have good connection, then start the car and turn ac on any change? if not you probably don't have any Freon due to a leak in the lines attached to your ac.
It sure sounds like a stuck-open thermostat to me. The coolant is flowing through the radiator when it is not supposed to. The car does not have any airflow through the radiator when it is sitting still, and when you take off the air blows through the radiator, thus causing the engine to cool down. The thermostat controls the flow of coolant through the radiator to keep the engine at operating temperature.
Cooling fan is controlled by ECM But does have a sensor located under the upper radiator hose at cyclinder head.Yellow & Black wires also check the connector for corrosion,replace also if corroded!! Heater Fan Check for power & ground At blower motor under pass side of dash.One connector.
Have you checked the earth? You may find current is going to earth via the fans. Find the earth for the heater and make sure it is earthing really well. Hope this helps.
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