Heater Fan

steiner_5000 · Post by **steiner_5000** » Wed Oct 10, 2007 7:51 am

Well its starting to get cold here in Iowa so I started up my bronco and turns the heat on but nothing happend. The heater fan doesnt' atcually kick on untill I have it on the highest setting. Does this mean my blower switch is bad or the blower itself?

partsman66 · Post by **partsman66** » Wed Oct 10, 2007 8:19 am

sounds like the switch.what year?

steiner_5000 · Post by **steiner_5000** » Wed Oct 10, 2007 9:55 am

Its an 85

Post by **Nobody** » Wed Oct 10, 2007 10:08 pm

sounds like the resistor to me. Open your hood. Look at the air box on the passenger side where the blower motor is. You shoud see a plug that connects to a little do-dad in the box held in by a couple screws. That's the resistor.

Ruffinit · Post by **Ruffinit** » Mon Oct 22, 2007 8:24 am

Yep, I think Nobody's got it pegged.

Just did the same thing to mine. On the highest setting the fan works because there is no resistance "in-line" with the blower motor. The other positions use a wirewound resistor to slow the motor (higher resistance = slower fan speed). Anyway, pull the plug, pull the resistor pack (2 screws) from the engine side and get another one. They don't go out often, so a pull from your local junk yard will most likely yield you a good one.