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#1 |
Registered User
Join Date: Feb 2013
Location: Winchester Kansas
Posts: 145
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Heater Emergency!!!
So temps finally dropped off to winter here in Kansas and my heater still may as we'll be an air conditioner. Swapped cores, put in all new heater gaskets and nothing has helped even after I let my truck idle and warm up for 10 minutes. Any advice/help would be greatly appreciated
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#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Heater Emergency!!!
a 190 radiator thermostat and good antifreeze
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#3 |
2WD Jimmy
![]() Join Date: Mar 2005
Location: Davis County, Utah
Posts: 2,564
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Re: Heater Emergency!!!
Have you put your hands on the heater hoses to see that they are warm and that the coolant is circulating in there? Is the heater valve opening and closing? And, of course, youve got the radiator topped off and full, right?
That thing should toast you right out of there. |
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#4 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Heater Emergency!!!
I'd check the heater valve. BEWARE there are 2 types that look similar. One that opens on vacuum and one that closes on vacuum. I think we want the close on vacuum type.
As Tom said check the heater hoses. Make sure BOTH of them get hot.
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#5 |
Registered User
Join Date: Feb 2013
Location: Winchester Kansas
Posts: 145
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Re: Heater Emergency!!!
How hot are we talking? Both get pretty warm after the truck runs a little
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#6 |
Registered User
Join Date: Feb 2013
Location: Winchester Kansas
Posts: 145
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Re: Heater Emergency!!!
Hoses, that is
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#7 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Check the cables on the dash unit. Make sure they operate the door for the hot air. Just because they slide back and forth doesn't mean anything. U have to watch and see them working.
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#8 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,144
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Re: Heater Emergency!!!
My heater will not blow hot air after just idling. It takes being driven a few miles and then it heats up slowly. After 3-4 miles it's really hot.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#9 |
Rusty Nuts
Join Date: Sep 2008
Location: Clever Missouri
Posts: 1,338
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Re: Heater Emergency!!!
I would say also check to see if the flapper door inside the heater box is open to let the heat from the heater core to blow out.
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(Clever Missouri) Southwest Larry Mr Chevrolet My Build, The Marathon Truck http://67-72chevytrucks.com/vboard/s...d.php?t=604414 |
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#10 |
Registered User
Join Date: Nov 2007
Location: Sask Canada
Posts: 1,666
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Re: Heater Emergency!!!
You will have to have a system pressure test to see if there is a leak. in most cases you rad cap is weak. Systems need 15 - 16 lbs psi to work right when it's cold. Start by replacing the rad cap first.
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Trueman |
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#11 |
Registered User
Join Date: Feb 2013
Location: Winchester Kansas
Posts: 145
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Re: Heater Emergency!!!
Thanks for all of the help guys, I really appreciate it. As it turns out, my radiator wasn't completely full. I topped it off before I went to class this morning and I'm going to burp my coolant system during shop today to get all of the air out (just in case). I'm not sure if my blend door is working right, but I think it is because when I move the lever, the air flow through my floor vent changes. I'll make sure it is when I replace my in-cab gaskets either tonight or this weekend. As for y'all who said to check my heater valves, I forgot to mention that the one of the POs by-passed them and installed straight hoses.
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#12 |
Registered User
Join Date: Feb 2013
Location: Winchester Kansas
Posts: 145
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Re: Heater Emergency!!!
One more question. How do you guys have your heater hoses routed? I've got the one from my water pump going to the inlet of my core at the bottom and the top return line going to the radiator. Is this right or wrong? The PO had them routed this way so that's how I did them.
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#13 | |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,144
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Re: Heater Emergency!!!
Quote:
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#14 |
Registered User
Join Date: Feb 2013
Location: Winchester Kansas
Posts: 145
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Re: Heater Emergency!!!
Glad to say that my heater works awesome now! Thanks to all who gave advice!
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1972, gmc, heater |
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