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Old 03-13-2019, 07:32 PM   #176
SBPage1
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Re: All about heaters.

Need some help. Took me awhile to find a thread that talked about heaters. Yes, these 60-66 heaters can be a challenge.

I have a 1961 C30 Apache Stakebed. I need to replace the Heater Blower Resistor. This truck has the recirculating heater. On this particular year, it appears that the resistor snaps into position on the backside of the heater box. Its difficult to get your hand behind the heater box to replace it.

Two questions:
1. Where can I get a resistor for this truck?
2. Any pictures for a breakdown on how to remove the heater box to replace?

I've attached a photo on how it looks. It was like this when I bought the truck. Only thing I can figure is someone took it out and couldn't get it back in.Name:  IMG_3060.jpg
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Old 03-14-2019, 08:23 AM   #177
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Re: All about heaters.

SB PM me your number so we can talk on the issue, way too much typing. There are several and seperate issues you will need to deal with and shortcuts you can do. I've attched a few pic for referance.
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Old 03-14-2019, 08:32 AM   #178
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Re: All about heaters.

http://www.truckandcarshop.com/ sells heater resistors and control cable sets.
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Old 03-14-2019, 08:41 AM   #179
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Re: All about heaters.

Years ago I walked into the GMC Truck Center in Montreal with my old resistor. The original was discontinued. Another parts guy comes over sweeps mine of the counter goes to the back and comes back with one from a 73 and up truck. " Just missing the notches. " I said. "Got a file ? " he responded. Learn from the masters.
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Old 06-08-2019, 12:52 PM   #180
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Re: All about heaters.

Jon, Thanks for this very helpful thread.
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Old 10-14-2019, 05:55 PM   #181
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Re: All about heaters.

So, I rebuilt the stock/original heater box that came with my 1960 GMC and I replaced the heater core and blower motor.

All of the blower motor I could find that were replacements had 2 wires (+/- I assume). The stock had one post that a factory terminal slide onto.

Am I to assume that the red(+) on the new motor connects to the old orange wire that originally slid onto the terminal on the old blower motor and the black (-) just gets grounded somewhere on the truck or heater box?

First 2 pictures are of the old motor and the last one is the new one.

Random question: what is the resistor for that's in the heater box, or really, why is it in the heater box?

Thanks!
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Old 10-14-2019, 06:53 PM   #182
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Re: All about heaters.

^ pretty sure that's a ground wire, more likely for boxes not all steel..

the resistor I believe lives inside the plenum for cooling and stay out of harms way, very fragile when warm depending on selected fan speed..

my best guesses, good luck!
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Old 10-15-2019, 01:01 AM   #183
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Re: All about heaters.

Quote:
Originally Posted by Killer Bee View Post
^ pretty sure that's a ground wire, more likely for boxes not all steel..

the resistor I believe lives inside the plenum for cooling and stay out of harms way, very fragile when warm depending on selected fan speed..

my best guesses, good luck!
Thanks for the response Killer Bee.

I imagine that makes sense, since a lot have plastic boxes.
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Old 01-06-2020, 01:50 PM   #184
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Re: All about heaters.

Subscribed. Good info.
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Old 01-06-2020, 03:03 PM   #185
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i just replaced my heater fan in my 1965 C20. Unbeknownst to me, I ordered a deluxe fan only to find it is a single speed fan. Very disappointed. Only plus is I now have heat and it is blowing semi lukewarm air. Might have to change a thermostat
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Old 01-06-2020, 04:05 PM   #186
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Re: All about heaters.

I installed a new heater but the fan just blows cold air. I even duct taped around the area on the lid where the pipes go in but still just cold air

Quote:
Originally Posted by akqj9 View Post
I have a 64 C10 with the thrift heater (one knob). I'm trying to take the core out to check it and I undid 4 screws that hold it in place. Each time I hear something drop like a nut or clip to thread into. I can't get the top off since there seem to be 3 screws on the back side that I can't get to without taking the entire until out. Do I need to take the glove box out to get to the bolts that hold the unit in?
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Old 01-06-2020, 04:22 PM   #187
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Re: All about heaters.

Quote:
Originally Posted by akqj9 View Post
I installed a new heater but the fan just blows cold air. I even duct taped around the area on the lid where the pipes go in but still just cold air
Did you let the truck fully warm up 185-210 deg....and if so Do you have a thermostat installed?
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Old 01-07-2020, 01:20 AM   #188
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Re: All about heaters.

Good point! My next step is to see if it has a thermostat as well. Everything else is new. I also installed a grounding strap from the heater to the firewall. No more blown fuses!
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Old 01-07-2020, 10:22 PM   #189
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Re: All about heaters.

Popped off the thermostat housing today. No thermostat installed. Replaced it with a 180 degree stat and now the heater is finally blowing HOT heat!
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Old 01-09-2020, 01:33 AM   #190
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Re: All about heaters.

I decided to tackle my heater, it had been inoperable for a decade or two according to the previous owner. Upon disassembly, I found the fan motor to be toasted and the heater core to be original and evidence of leaks. This is the thrift heater in the 1964 GMC, even though it is a full airflow heater it has a smaller core and single push pull damper and fan switch. The core measured 7-1/8", based on a poster in this thread I decided to up grade to the larger core which is a full 9.5". Oddly enough the core mounting plate is stenciled for the larger core, so it was a matter of jigsawing the metal plate. I found a full size core from the filling station, beware there are vendors that sell cores that are only 1.5" thick instead of the full 2.5", not nearly as efficient and you will have to fab up a mount for the thinner core. The core from the filling station fit like original, literally took me less than 5 minutes to fab up the mounting plate to accept the bigger core. Here are some pictures of the heater sheet metal after I glass beaded it. Some others finished. BTW, it blows hard and hot, a great modification and cost nothing more than a regular fix.
Steve
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Last edited by sstock; 01-09-2020 at 01:39 AM.
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