The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Electrical

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 12-01-2018, 04:02 PM   #1
Jered1987
Registered User
 
Jered1987's Avatar
 
Join Date: Aug 2017
Location: Calhoun,ga
Posts: 139
Blower motor

Iím wondering where to start
When I took my truck out back a few months ago
I had to use the defrost and the blower was working so slow
I had to keep the windows up just to keep the windshield from fogging up.
I can turn it to whatever and it barely is running all you hear is it barely running and squeaking.
Jered1987 is offline   Reply With Quote
Old 12-02-2018, 01:14 AM   #2
dmjlambert
Senior Member
 
dmjlambert's Avatar
 
Join Date: Apr 2016
Location: Cypress, TX
Posts: 1,307
Re: Blower motor

The last time I had that happening, I removed the blower motor and used jumper cables to connect it directly to the battery to test that it worked OK. It did not work OK so I went up to O'Reilly and got a new blower motor.

I believe the auto parts stores only carry the A/C blower motor, and not the heater-only blower motor. So if you have a heater-only truck it may be best to look online and see what you can find for a blower motor. There is not a lot of information about this online for some reason. Here is an old post with some info, including from GMCPaul. http://67-72chevytrucks.com/vboard/s...ad.php?t=76855 Back when this was originally posted GMCPaul said he stocks both types of motors, A/C and heater.

The AC blower motor draws much more current at high speed compared to the heater blower, so the factory A/C wiring includes a relay to operate the fan on high, so too much current doesn't go through your fan switch and burn it up. If you have a look at the wiring for the A/C in the service manual, you'll see how they dealt with the fan wiring and relay, and the fuse is 25A instead of 10A. The electricity when the blower is on high goes from the CIG connector on the fuse panel, which is always on unswitched and unfused power, through a 12 gauge orange wire through the relay, and to the blower motor. To run an A/C blower motor in a heat-only truck you could probably add a relay to provide that amount of power to the blower when it is on high.

Here is another thread on the subject, with the service manual page that I posted with the electric diagram.
http://67-72chevytrucks.com/vboard/s...d.php?t=727010

Last edited by dmjlambert; 12-02-2018 at 01:23 AM. Reason: add more info
dmjlambert is offline   Reply With Quote
Old 12-02-2018, 01:22 PM   #3
Andy4639
Orignal Goof member
 
Andy4639's Avatar
 
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 17,230
Thumbs up Re: Blower motor

It could be several things. Mice and what not they have filled the heater box up with nesting crap and have the heater motor bogged down.
Could be the motor it's self. Quick check is take the lead off the motor and jumper it out to the battery + terminal. If it blows hard then it could be in the levers not adjusted right are the fan switch is bad.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver
Seeing the USA in a 71


Upstate SC GM Truck Club
2013,14 and 2016 Hot Rod Pour Tour


http://upstategmtrucks.com/



Get out and drive the truck this summer and have some fun!
It sucks not being able to hear!

LWB trucks rule, if you don't think so measure your SWB!
After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.
Andy4639 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 06:48 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com