No Heater Fan Until .................
Thread Starter
|
Senior User
Joined: Apr 2004
Posts: 136
Likes: 0
No Heater Fan Until .................
1999 Explorer 4.0L.
All of a sudden I have no heater/ac fan. Check all the fuses and relays, all good. Still no go.
Watched all the You Tube videos on changing the fan and resistor in the engine compartment.
Then I decide to tap the air box under the glove box and she fired right up.
What am I missing ???????????????????
All of a sudden I have no heater/ac fan. Check all the fuses and relays, all good. Still no go.
Watched all the You Tube videos on changing the fan and resistor in the engine compartment.
Then I decide to tap the air box under the glove box and she fired right up.
What am I missing ???????????????????
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
fan resistor normally does not effect HIGH speed, just the lower speeds.. ALL speeds need a good ground. I would look at the ground wires for corrosion. Might also think the blower motor has a sticky bearing and causing the non run problem.
Posting Guru
Joined: Apr 2000
Posts: 1,746
Likes: 4
From: PNW
I've seen this problem with starters. A starter sometimes gets a bad spot on it and won't start. Give it a tap with a hammer while trying to start and it turns right over. It just needs a little help getting off the bad spot. Not saying this is definitely the problem but something to consider.
Do you have a DMM? If so, try backprobing the connector on the fan motor (assuming you have access) to determine if you have power to the motor when it's not running.
As mentioned above, grounds are always good to check, but I would also check the other wires for chafing and any connectors in the circuit for corrosion. Sometimes critters like to get under the hood and chew on wire insulation.
Do you have a DMM? If so, try backprobing the connector on the fan motor (assuming you have access) to determine if you have power to the motor when it's not running.
As mentioned above, grounds are always good to check, but I would also check the other wires for chafing and any connectors in the circuit for corrosion. Sometimes critters like to get under the hood and chew on wire insulation.
Thread
Thread Starter
Forum
Replies
Last Post
dethomson
1973 - 1979 F-100 & Larger F-Series Trucks
3
Sep 6, 2011 03:16 PM
Midnite1987
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
10
Feb 5, 2011 02:27 PM
