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#1 |
Registered User
Join Date: Sep 2013
Location: Lakeview Terrace
Posts: 190
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69 C10, F'N hot cab
Okay, I've had this truck for couple of years and it's got a 350 crate engine, stock tranny (granny 1st gear) and stock rear end. The thing that is driving me a bit nuts is that the cab gets super hot, especially in the summer.
I get that if it's summer the truck will feel hotter, but a lot of the heat is coming from under the dash. Feels as though the heater is on, when it's not. Any suggestions on what to do/look for?
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"If you aint first your last!!" 1969 GMC C1500 Stepside Shortbed - daily driver Mando |
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#2 |
Registered User
Join Date: Aug 2016
Location: Idaho Falls, ID
Posts: 233
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Re: 69 C10, F'N hot cab
I just put a ball valve under the hood myself. You can install it inline into either heater core hose. Turn it off in the summer, open in the winter. Problem solved.
There are some cheap plastic valves you can use, I put in a quality ball valve from the hardware store. |
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#3 | |
Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 3,092
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Re: 69 C10, F'N hot cab
Quote:
Even after you do that, you may still get heat intrusion through the fire wall and front part of the floor. No doubt stopping the heater from blowing hot air into the cab is going to make a large difference!!! -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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#4 | |
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Join Date: Sep 2013
Location: Lakeview Terrace
Posts: 190
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Re: 69 C10, F'N hot cab
Quote:
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"If you aint first your last!!" 1969 GMC C1500 Stepside Shortbed - daily driver Mando |
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#5 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: 69 C10, F'N hot cab
Dude bypass the heater core completely if it is that bad.
You may have holes in your firewall that are letting heat right in or even the seal around the heater box is bad. And I bet you don't have carper or any insulation.
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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#6 |
Registered User
Join Date: Aug 2016
Location: Idaho Falls, ID
Posts: 233
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Re: 69 C10, F'N hot cab
Yes it can go in either hose.
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#7 |
Registered User
![]() Join Date: Dec 2013
Location: Omaha NE
Posts: 620
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Re: 69 C10, F'N hot cab
I use one of these on my '70 Corvette.
Just google heater hose shut-off.
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1972 C10 Custom Deluxe LWB, 402/400, PS, PB, A/C, Highlander, Hugger / White 1971 C10 Cheyenne LWB (SWB), 350/350, PS, PB, A/C, Dark Olive / White. |
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#8 |
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Join Date: Mar 2015
Location: Fletcher, N.C.
Posts: 309
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Re: 69 C10, F'N hot cab
X2 of the above...
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1970 C/10 350/T5 SWB stepper... 1979 Corvette 350/Auto T-top... 2010 Acura RL... 2015 2500HD Z-71 Silverado... |
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#9 |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,513
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Re: 69 C10, F'N hot cab
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Do you have your kick panel vents open to let fresh air in? Best course of action would be to disassemble your heater and fix it right. It's probably full of mouse nests and won't let the diverter door close. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#10 | |
Registered User
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Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: 69 C10, F'N hot cab
Quote:
You may also have a circulation issue under the hood, check fan shroud, fan blades for proper spacing from radiator. A clogged heater core will reap all kinds of havoc also. |
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#11 |
Registered User
Join Date: Sep 2013
Location: Lakeview Terrace
Posts: 190
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Re: 69 C10, F'N hot cab
Thanks guys for all the replies...the fan shroud is fine and fitted correctly, fan blades, spacing all appear to be okay.
Kick panels are both closed, I'll also check the heater diverter to see if it's closed all the way. I'll install the heater hose shut off valves and I hope that helps. Appreciate all the help here fellas!!
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"If you aint first your last!!" 1969 GMC C1500 Stepside Shortbed - daily driver Mando |
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#12 |
Registered User
Join Date: Jan 2017
Location: Larkspur, Colorado
Posts: 916
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Re: 69 C10, F'N hot cab
The heater issue fixed will get you a good start but it's really worth it to take a weekend and go a couple steps further. Most of these trucks lack the tinted glass option and you have a clear glass green house roasting you in the sun from all sides. Tint the windows. Second, seal up the firewall and floor. good chance the heater box has already been out for something and the seal (s) damaged or missing. Replace 'em if necc. While that's out check the rest of the firewall and floor for major holes letting underhood-chassis hot air into the cab. Insulate the firewall-floor with some type of Dynamat material. You won't believe the differences these changes will make toward comfort in the cab.
Steve weim55 Colorado |
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