Heater oddity

[Germy]

My heater does not come on when I turn the dial. Once I start driving, it comes on. The connections are good, blower motor new, new wiring. Just am at a loss. Could it be low voltage? The alt is new and battery checks out. I am really stumped!

 

[Cheepjeep85]

Could be the swtich itself, they do wear out, the contacts inside may be burnt or just wore. Check the fuse block too, after I did the blazer blower motor install, mine burnt the switch, and the fuse block. I had to put in a new switch, and pull the wire from the fuse block, and put in a inline heavy duty fuse holder, untill I can afford a new harness.

Droooiiddd 2

 

[BusaDave9]

Sounds like a bad connection. I would double check the connection right on the fan motor. It's in the engine compartment below the battery. I had problems with that until I cleaned the connector and used dielectric grease.
You say new wiring. All new harness? If you try wiggling the connections can get affect the fan.

 

[CJim7]

There's also a wire on the inside that connects to a spade directly on the plenum....i think its a ground wire. Make sure this thing has good connection or your fan wont run.

 

[Germy]

Ok, wiggled all connections, no luck. I guess a switch right? Here is the thing, I just replaced alternator bc of dimming lights. I noticed today that at idle, the lights were dimming with the rotation of the motor.Would this low voltage stop the fan from running?

 

[Germy]

Btw, ordered the fan upgrade!

 

[Germy]

Was the switch, jumped a hot lead to the fan. Got a new switch but doesn't match the plug configuration. Ordering another tonight!