94 GMC Jimmy heater fan not working

If it blows immediately after turning the fan on, there must be a short. If it takes a few seconds, the motor could need to be oiled, unrestricted (if something is stopping the squirrel-cage from turning), or possibly replaced. Don't go with a larger fuse; you'll burn up the wiring.

are both heater hose getting hot

hi,

found this for you..

https://www.2carpros.com/questions/gmc-jimmy-1996-gmc-jimmy-heater-blower-motor-not-working

The idle could be a few things dirty air filter or fuel filter i would check these first you don't mention any engine codes so its likely a minor problem . The antifreeze leaking inside is comeing from the heater code eighter you should check the heater hoses that connect to the core to make sure its not leaking at the nipple but you have a 94 so it may be the core it self has a hole rotted in it or poped a solider joint. How dose the heat work in the vehicle is it ok or blowing cool or cold air . this will tell you a lot because clogged heater cores tend to rot out where if you have good heat then it maybe a minor leak at the hoses good luck with it

Manny:
The heater is behind the dash. You will need to take the dash out of the truck.
Good luck

Mine did the same thing you need to have heater core flushed out. Dexcool coolant clogs it up get it and the radiator back flushed and changed to regular coolant. This should fix the problem.

Could be a couple of things.

1. May need to replace your thermostat ($10 DIY)
or
2. Heater core may be bad

fuse blows. unplug heater blower motor turn ignition on, turn heater on, does fuse blow? if not need to replace heater blower motor

Disconnect the heater hoses from the water pump and the intake manifold. Get a compressor and blow out the hose (put the air hose into the the hose that came off the mainfold. then flush the system and replace the antifreeze.