heater location - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MyakkaJeff · 02-17-2007, 06:07 PM

My 63 c10 has the heater core in the cab and has the cutouts in the firewall blocked off. My 66 c10 has the heater core under the hood. Why 2 different locations? Thanks, Jeff.

19GMC63 · 02-17-2007, 06:44 PM

all 60-63s had in cab, and 64-66s had it under the hood

MyakkaJeff · 02-17-2007, 07:24 PM

19GMC63- Thanks, seems kind of backwards, the in cab looks more modern to me. Didn't most cores end up in-cab?

MyakkaJeff · 02-17-2007, 07:28 PM

Also, the firewall is already set up for underhood on my 63.??

markeb01 · 02-19-2007, 11:20 PM

Hi there, GM offered two different styles of heater in this series of trucks. The model that has the core and fan inside the cab is the recirculating or ecomony type, and uses only two of the slide levers on the dash. The version with the core and fan on the engine side of the firewall is the deluxe, or fresh air type, and uses all four of the heater slide switches.

On the 60-63 series the inside ducting is the same for either type (from what I've experienced). Since I have a 1960, I'm not as familiar with the 64-66 flavor although I believe the firewall and mounting are different from 60-63. Full specifications for both types are shown in the GM service manual which is available as a reprint.

02-17-2007, 06:07 PM	#1
MyakkaJeff Junior Member Join Date: Dec 2006 Location: Florida, Myakka River Posts: 143	heater location My 63 c10 has the heater core in the cab and has the cutouts in the firewall blocked off. My 66 c10 has the heater core under the hood. Why 2 different locations? Thanks, Jeff. __________________ '63 C10 lwb flatbed '66 C10 lwb stepside '68 C10 lwb stepside (parts) '68 C10 lwb fleetside (17 yr old son's ongoing project) '03 HUMMER H2 (wife's) '06 3500 flatbed liftgate (My work truck)

02-17-2007, 06:44 PM	#2
19GMC63 Registered User Join Date: Nov 2006 Location: Nashville, TN Posts: 1,510	Re: heater location all 60-63s had in cab, and 64-66s had it under the hood

02-17-2007, 07:24 PM	#3
MyakkaJeff Junior Member Join Date: Dec 2006 Location: Florida, Myakka River Posts: 143	Re: heater location 19GMC63- Thanks, seems kind of backwards, the in cab looks more modern to me. Didn't most cores end up in-cab? __________________ '63 C10 lwb flatbed '66 C10 lwb stepside '68 C10 lwb stepside (parts) '68 C10 lwb fleetside (17 yr old son's ongoing project) '03 HUMMER H2 (wife's) '06 3500 flatbed liftgate (My work truck)

02-17-2007, 07:28 PM	#4
MyakkaJeff Junior Member Join Date: Dec 2006 Location: Florida, Myakka River Posts: 143	Re: heater location Also, the firewall is already set up for underhood on my 63.?? __________________ '63 C10 lwb flatbed '66 C10 lwb stepside '68 C10 lwb stepside (parts) '68 C10 lwb fleetside (17 yr old son's ongoing project) '03 HUMMER H2 (wife's) '06 3500 flatbed liftgate (My work truck)

02-19-2007, 11:20 PM	#5
markeb01 Senior Enthusiast Join Date: Feb 2007 Location: Spokane Valley, WA Posts: 8,356	Re: heater location Hi there, GM offered two different styles of heater in this series of trucks. The model that has the core and fan inside the cab is the recirculating or ecomony type, and uses only two of the slide levers on the dash. The version with the core and fan on the engine side of the firewall is the deluxe, or fresh air type, and uses all four of the heater slide switches. On the 60-63 series the inside ducting is the same for either type (from what I've experienced). Since I have a 1960, I'm not as familiar with the 64-66 flavor although I believe the firewall and mounting are different from 60-63. Full specifications for both types are shown in the GM service manual which is available as a reprint.



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