Question about Cars & Trucks
My cars heater and fan wont go at all internally-have checked fuses and thry are fine can you help please??
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Posted on Jan 02, 2017
SOURCE: running hot
Sounds like Clutch in your fan
The coolant level is right on, no hoses are leaking and the accessory belt is intact. You start the engine, let it idle and make a visual inspection. There's no sign of belt slippage.
If your car is like most, the cooling fan is mounted to its drive pulley via a clutch. Clutch fans operate at different speeds under different conditions to help reduce drain on the engine and to save fuel. When the engine is hot, the clutch fan runs nearly as fast as the engine. When the engine is cold, the fan runs much more slowly.
The fan clutch operation is regulated by a valve that is opened and closed by a thermostatic spring. The valve controls the flow of a viscous silicone fluid between chambers in the clutch assembly. When the engine is cold, the clutch is essentially disengaged, which is why the fan runs at its slowest compared to the engine's speed. As the engine warms up, the air flowing to the fan assembly becomes hotter. The hotter air causes the thermostatic spring to unwind and open the valve. Silicone fluid from the reservoir chamber flows into the main chamber, engaging the clutch, and the fan spins faster (though it's still slightly slower than the engine.
Hope this helps!
Posted on Dec 14, 2008
It sounds like your relay could be bad. When your relay contacts become worn your volt meter will show 12v coming out of the relay until you put a load on the circuit, then the power goes away. You have to get to the wire going to your blower either from the back of the relay or by sticking a straight pin through the hot wire. Clip your + lead to the pin and the - to a ground. Turn blower switch on. With the blower unplugged you will show 12v but when you plug in the blower the power will disappear. If this is the case your relay is bad.
Posted on Jun 25, 2009
Check the fan itself for free turning--if it grinds or is hard to turn, replace the fan motor. The engine heat sensor reports temperature to the computer which turns on the relay and it turns on the fan motor. If you have A/C, turn it on--that should force the fan on all the time the car is running. If that works, then replace the sensor. If you don't have A/C, take a chance on the sensor--it's not too expensive. Wrap the threads with several turns of teflon tape when installing and don't over-tighten.
Posted on Sep 03, 2009
There is a little utility/tool that is on the internet (can be found with a bit of searching). You put your serial no. in and it gives you the correct code. I have tested on three of my own units and correct code each time, as per the issued radio passport. I will not say where on internet, as I agree with what "emissionwiz" stated about how do we know radio not result of illegal activities.
Posted on Oct 29, 2009
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