Radiator Fan Wont Come On

The ecu signals the radiator fan to work at the precise time.

Undertale fan gamescom. Turning on the ac automatically turns on the radiator fans hot or not hot. Youll need to locate and test the engine temp sensor. If your sonic has a bad engine temp sensor the radiator fan wont know to come on because the ecu wont know how hot the engine is.

Visually check the fan if you dont hear its noise. In all cases below i tested the radiator fan by turning on the air conditioning thus forcing the cooling fans to run and also. Depending on the model year and engine the location varies.

I have a 2000 dodge grand caravan that has 195000 miles. The issue presented itself with a check engine light and the radiator cooling fan not turning on. Once the temp gets so hot the ecu commands the radiator fan to come on.

In order for the ac condensor to do its job it must stay as cool as it can. My cooling fan wont turn on when i turn the ac on. Depending on the model year and engine the location varies.

My radiator fan wont turn on and im stumped. If your compass has a bad engine temp sensor the radiator fan wont know to come on because the ecu wont know how hot the engine is. Once the temp gets so hot the ecu commands the radiator fan to come on.

So do not worry if the fan doesnt immediately start working. I noticed my cooling fan stopped working and would only come on when i had the ac on. Have 07 pontiac grand prix 206000 mi.

Just recently the cooling fans wont come on. Why wont a radiator fan turn on. However the radiator fan does not always start spinning on ignition.

A cars electric cooling fans are responsible for ensuring air flow over the radiator at low speed and failure will almost always cause overheating while in traffic. And when i do turn my ac on the car seems to get hotterit had reached 2300f at one point but i got no lights saying it overheated and i never let it go higher to see. Youll need to locate and test the engine temp sensor.

The trouble code indicated the cooling fan relay was faulty. By richard rowe. Now running tests with the car in park and i cant get it to go past the normal temp about 1980f for my 08 hhr.

I have a similar problem and cannot find my specifics after doing a lot of research and forum reading so i hope someone here could help me. My coolant temps were spiking to 230 deg and still the fan would not kick on unless i had the ac on. Fortunately these systems are fairly easy to diagnose in the event of failure.

Of course when im driving temp gauge is ok when idling temp gauge rises almost to red line.