Climate control / Fan Problem!

[f150fan]

Last week the fan blower on my SHO would work on and off during all settings of the climate control. It started working fine for a couple days then stopped working again, so I replaced the blower motor. However, two days after the installation of the new blower motor it is not functioning properly again. It is not the blower motor but something else which I have no idea. When the ignition is turned on, all that can be heard is a small groening noise comming from the fan area which does not vary with the climate control on or off. The fan rotates at a very slow rpm regardless of the climate control setting, including off. I did the self test on the climate control and it came up with nothing. Any ideas? thanks

Gregory Brown

 

[SHOZ123]

Heater fan relay located in the engine compartment fuse box.

 

[f150fan]

Heater fan relay located in the engine compartment fuse box.

Paul, you are the man! That was it....the old relay looks like it caught on fire as it melted everything around it! too bad it didnt keep burning and take the whole car with it!!!

 

[SHOZ123]

Same thing happened to me out in California last summer. They must build up resistance on the internal contacts. This causes excessive heating at the plug end.

 

[f150fan]

Problem again! The new relay I just put in burned up again. It worked for an entire day and then fried. This time it melted a bunch of plastic. :shakehead Something is definately wrong and I have no idea!!! Paul?

 

[Allmostall]

Need to check the connections where the relay plugs in. Damaged connections
will cause high resistance and generate a lot of heat.

 

[SHOZ123]

I agree, the relay socket is probably had it. Cheap way around would be to mount the relay externally.