Cold Climate Package - special heater
What makes the heater and defroster special in the cold climate package? Is a larger fan used?
K81 - Cold Climate Package (Including Special Insulation, 66 Amp Alternator, Special Heater & Defroster, Engine Block Heater, HD Battery.) |
Re: Cold Climate Package - special heater
bigger heater core I think
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Re: Cold Climate Package - special heater
The only thing I have found for K81 is the larger alternator (66 AMP). It may vary a little depending on the year of the truck, but that was the only code description I have found.
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Re: Cold Climate Package - special heater
If someone knows how to source the K81 heater core, I'd be happy to know about it, particularly if it can be retrofitted to a non-K81 truck.
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Re: Cold Climate Package - special heater
I’m not sure if your unit was on a A/C unit or none A/C unit that it came from.?
I had a cold area heater box that had an extra flap that could be opened at feet heat. ( 1975 350 A/T TH350 none A/C unit) 37AMP/43AMP. If it were a A/C unit it may have had a VAC access climate controls with one or two cables. Those would have the higher amp ALT. as the 66AMP.( might have had a amped up blower) Or just manual cable only unit with A/C not to common after 80. Not sure if this will help or not. |
Re: Cold Climate Package - special heater
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How do you open the extra flap? I've always just used the controls in the dash. |
Re: Cold Climate Package - special heater
Pretty interesting. I live in a cold climate and this is the first I have heard of this option. I have never seen in on any of my SPID's either. My 76 GMC is from North Carolina and the heat is so hot it takes my breath away.
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Re: Cold Climate Package - special heater
There is a cable that runs of one of the leavers. It's nice on the cold night in fall and winter to warm up the floor take some of the cool out of the floor area this is only on the None A/C units. My 84 did not have it the 75 and the 77 all three where made in Canada & None A/C units. You really feel the difference on a good highway drive when it cold.
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Re: Cold Climate Package - special heater
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I have no ac and the cold climate package. I do have a floor heater. |
Re: Cold Climate Package - special heater
Some info here on it
http://www.chuckschevytruckpages.com...s_1973-87.html K81 - Cold Climate Package (Including Special Insulation, 66 Amp Alternator, Special Heater & Defroster, Engine Block Heater, HD Battery.) |
Re: Cold Climate Package - special heater
Also info here about it.
It is sideways on page 13 https://www.gmheritagecenter.com/doc...t-Suburban.pdf |
Re: Cold Climate Package - special heater
My 78 was non A/C. When the heater motor went I replaced it with a motor for an A/C unit. You could cook pizza on the dash. It put out crazy heat.
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Re: Cold Climate Package - special heater
^ Sounds like it put out more heat with the upgrade fan. Good tip as my truck never feels like it heats up enough.
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Re: Cold Climate Package - special heater
Yes.…. Crazy heat with the new larger A/C motor.
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Re: Cold Climate Package - special heater
I only use my blower for a couple minutes then keep it on low the rest of the day with temp in the middle. Any higher than that and I literally can't breath.
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Re: Cold Climate Package - special heater
Up here in Canada the heavy duty heater option wo/AC consisted of and extra position on blower switch low- med1- med2 -high. there was an extra wire to the resistor and and it was shaped similar to the a/c resistor with the extra circuit for almost no resistance so the blower motor blew faster than normal and it was a little bigger armature with the cooling tube added to it .
It was easy to retrofit because the blower wiring harness was separate but it still plugged in to the main harness at the blower switch (brown) and at the blower box you could drill the hole for the cooling hose and enlarge the hole for the resistor. Easy way to tell HD or not , is the extra position at blower switch or different shape resistor at box. Parts- Blower box (or modify) Blower motor Blower cooling tube Cooling tube to box plastic adapter + screw 4 position resistor 4/wire wiring harness to switch Extra position blower switch |
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Is your switch a 4 position switch? I have an 81-82 Diesel parts truck with a full firewall insulation in the engine compartment. It has no glove box door so no codes. Im guessing the insulation is to keep the clatter out but it should keep the heat in the cab as well, I would think. The L&R sides of the windshield on my 81 K30 will freeze into a thick icy mess if I have the defroster on while it is snowing and going down the road. The only way to be able to drive is to keep the windshield cold. I am switching to an AC cab but I want to be able to fry bacon in there. |
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Is the 4 position fan switch only on the cold climate packages? |
Re: Cold Climate Package - special heater
Following, any pictures?
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