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Heater blower motor
#783016 September 30th 2021 12:55 am
Joined: Oct 2002
Posts: 3,601
Likes: 10
pooh-bah
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pooh-bah
Joined: Oct 2002
Posts: 3,601
Likes: 10
I replaced the heater blower motor and resister in my 89 E150, previous idiot wired it straight to the battery due to the dash switch being stuck, dad sprayed it with electrical cleaner to get it moving and decided to put it back as it should be, yes it was reading 12 volts when turned on, the black wire reads resistance according to fan speed, indicating it all should be fine but the motor doesn't come on, if you wire it straight to battery it works tho. I flip the dash lever back and fourth, can hear the relay clicking, I did not pull the plug to see if it the constant hot wire has power, but if the wire that runs to the heater reads 12 volts you'd think that means yes, its hot. I am getting sick of fooling with it, only thing I haven't done was replace all the battery cables and grounds, god help me to get room means pulling the battery, it has a hose over it that runs from a fan to cool my injectors, so it ain't pleasant to get out. I really hate Ford for this nightmare, too much stuff has to be removed to get at anything, not like you can just replace a part without removing everything surrounding it, the fan speed selector runs to the resister, perhaps praying it to break it loose didn't really get it working, perhaps the contacts inside are bad.

Re: Heater blower motor
maples01 #783039 September 30th 2021 4:19 pm
Joined: Aug 2017
Posts: 1,061
Likes: 47
old hand
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old hand
Joined: Aug 2017
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Did you test the relay? You said it clicks but maybe there's something else wrong with it.

Re: Heater blower motor
maples01 #783128 October 01st 2021 8:07 pm
Joined: Jan 2014
Posts: 2,290
Likes: 137
veteran
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veteran
Joined: Jan 2014
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I'm thinking along the same lines as Cornfarmer. Could still be clicking and yet not making proper contact. Only other thing I could think of is the switch itself might be like a rheostat and not sending enough voltage when turned on.


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Re: Heater blower motor
maples01 #783426 October 07th 2021 3:02 am
Joined: Oct 2002
Posts: 3,601
Likes: 10
pooh-bah
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pooh-bah
Joined: Oct 2002
Posts: 3,601
Likes: 10
Well the relay was getting the signal to switch on/off, but it was not fully engaging, so no power to the motor, I put a new relay on the outside of the grill, was not going to pull the battery out again, finally the blower functions, so much for the previous owners hacking a hot wire to run to it, now to remove the rest of the wire tapping to get the radio correctly connected. I can say O'reilly is the only one selling the heater relay. I've spent a lot replacing heater parts due to hacking, but the wheelchair lift will likely be the winner on what cost more to repair.


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