Heater not blowing air
Thread Starter
Intermediate
Joined: Jan 2018
Posts: 40
Likes: 0
Heater not blowing air
My heater in my 77 is not blowing air, not sure if the blower motor is bad yet, is there a relay for that blower motor that might be bad? If so does anyone know it’s location ?
Le Mans Master
Joined: Aug 2006
Posts: 7,427
Likes: 1,560
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Have you checked that the fuse is good?
https://docs.google.com/viewer?a=v&p...TUxMDNiMTY3Nzk
If yes then apply 12 volts to the fan motor and prove that it works.
https://docs.google.com/viewer?a=v&p...TUxMDNiMTY3Nzk
If yes then apply 12 volts to the fan motor and prove that it works.
Burning Brakes
Joined: May 2013
Posts: 789
Likes: 129
From: Los Banos CA
Yep, check the fuse first, then the motor, as Peterbuilt mentioned. If running 12 volts to the motor doesn't make it spin, then verify that the blower motor case is grounded (run a wire from one of the mounting screws to a ground location). If connecting power to the motor makes it spin, then your problem could be in the switch or the heater resistor (although I think the motor would still spin on 'hi' if the resistor was bad?).
If you have a voltmeter or a test light, you can also use that to verify if you have voltage getting to the motor or not.
If you have a voltmeter or a test light, you can also use that to verify if you have voltage getting to the motor or not.
Last edited by bradleyb66; Jan 24, 2018 at 05:27 PM.
Burning Brakes
Joined: May 2013
Posts: 789
Likes: 129
From: Los Banos CA
BTW - no, there isn't a relay, but there is the resistor (to control the speeds). The resistor on a 79 is under the hood, on top of the air conditioning box - 77 might be in the same location.
