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#1 |
Registered User
Join Date: Jun 2009
Location: Eugene, OR
Posts: 200
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Heater (electrical) Questions ???
I bought my '66 at the beginning of this summer, and up until now I had never turned on my heater fan...mainly due to the fan control lever being broken off. Recently, the temps have dipped into the teens, so I decided to try and turn on the fan by sticking a little screwdriver in the slot where the lever would be and move the broken lever into the on position. It worked...the fan operated in both low and high mode.
Here's my problem...while the fan was on high, I noticed that the generator light was dimly lit. When I turned the ignition key off, the engine didn't immediately shut off and ran a few seconds longer while the key was out. Then I realized the key was hot. So, I reached up behind the dash and felt the back of the ignition switch and it was burning hot. I let the switch cool down, then tried the fan in the low position and drove a few miles. The gen light was no longer on, but the ignition was still hot, but not as hot as when the fan was on high. Can anyone tell me what the h*ll is going on?
__________________
Project Build (1): http://67-72chevytrucks.com/vboard/s...d.php?t=362482 Project build (2): http://67-72chevytrucks.com/vboard/s...d.php?t=370985 “Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming...Wow, What a Ride!” - Hunter S. Thompson |
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#2 |
Senior Enthusiast
Join Date: Feb 2007
Location: Spokane Valley, WA
Posts: 8,356
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Re: Heater (electrical) Questions ???
I'm not an electrical professional, but it sounds like the heater motor is drawing more amps than the electrical system can support. When the motor is set to either of the two lower speeds, it is running through a resistor in the back of the inside ducting. The two legs of the resistor cause the motor to run at the two different reduced speeds. In high fan mode, the power goes straight to the motor.
Hopefully one of the electrical experts here can provide a technical answer, but I would be looking for anything that increases circuit resistance, like a bad feed wire, bad ground, or the motor has an internal breakdown in the windings. I know it's getting cold out, but I wouldn't be running the heater at all until this is resolved, as it could easily start an uncontrollable electrical fire. I had the same problem with an aftermarket a/c-heater system. The motor itself got so hot it actually started generating smoke in the cab. After the 2nd replacement motor did the same thing, I pulled it and replaced the motor with one from a Fiero, and never had another problem. |
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#3 | |
Registered User
Join Date: Nov 2009
Location: Cremona AB Canada
Posts: 370
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Re: Heater (electrical) Questions ???
Quote:
__________________
62 GMC 910 short fleetside 454 super t10 14 bolt w/gov lock 70s c20 front discs (built in the 80s) 65 GMC 930 dualwheel 292 4spd all origonal 39k mi(my sons truck) 63 GMC 950 camperized school bus, (Gus the bus) 350 4speed 2 speed rear 64 GMC 950 "spare" bus 283? 4speed detroit locker 53 GMC 1ton dual wheel bus 78 GMC c25 short course off road race truck(son's truck) 355 th400 14 bolt (www.wheel2wheel.ca) 88 Peterbilt 379 longhood (hauls race truck) ![]() ![]() ![]() ![]() |
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#4 |
Registered User
Join Date: Jun 2009
Location: Eugene, OR
Posts: 200
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Re: Heater (electrical) Questions ???
So, I replaced the blower motor and it did not fix the problem. Then I replaced the butt connectors on the ignition switch. Still having the same issue...the ignition terminal on the ignition switch gets burning hot when heater fan is on. I just ordered a new ignition switch from Brothers, hoping that it's the problem.
__________________
Project Build (1): http://67-72chevytrucks.com/vboard/s...d.php?t=362482 Project build (2): http://67-72chevytrucks.com/vboard/s...d.php?t=370985 “Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming...Wow, What a Ride!” - Hunter S. Thompson |
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#5 | |
Registered User
Join Date: Nov 2009
Location: Cremona AB Canada
Posts: 370
|
Re: Heater (electrical) Questions ???
Quote:
__________________
62 GMC 910 short fleetside 454 super t10 14 bolt w/gov lock 70s c20 front discs (built in the 80s) 65 GMC 930 dualwheel 292 4spd all origonal 39k mi(my sons truck) 63 GMC 950 camperized school bus, (Gus the bus) 350 4speed 2 speed rear 64 GMC 950 "spare" bus 283? 4speed detroit locker 53 GMC 1ton dual wheel bus 78 GMC c25 short course off road race truck(son's truck) 355 th400 14 bolt (www.wheel2wheel.ca) 88 Peterbilt 379 longhood (hauls race truck) ![]() ![]() ![]() ![]() Last edited by 62gmc910; 12-08-2009 at 01:23 AM. |
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