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#1 |
Registered User
![]() Join Date: Aug 2015
Location: kokomo,indiana
Posts: 334
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Not much Heat, Help
Evening All
1972 c10 , 1979 chevy 350,new 4 core aluminum radiator, replaced heater core when working on truck, drove all summer, temp gauge stayed lower side of left side, now its getting colder, truck puts out very lukewarm heat, heater hose's , 3/4 hose runs from top of water pump to top of heater core, lower 5/8 hose runs from manifold by thermostat housing to bottom of heater core, changed thermostat out to 180, used heat gun and hoses and radiator is getting hot to touch, about 90 to 100 on heater hoses, radiator hoses are a bit hotter 135 Thanks , any help appreciated
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A Little Better Every Day Cancer Survivor, most dont know what they have until its gone, appreciate everything Last edited by twoskies; 11-25-2019 at 10:00 PM. Reason: Adding pictures |
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#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,621
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Re: Not much Heat, Help
Put a 195 thermostat in it.
And maybe look for a winter front to cover the grill. |
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#3 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Have you taken the lower heater stuff a part inside the truck and cleaned it out good? Are your side vents closed? Make sure the cables are adjusted right and are operating the flapper door inside the box. Is the element working inside the lower box?
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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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#4 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,637
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Re: Not much Heat, Help
Maybe a plugged (or partially plugged) heater core?
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#5 |
Registered User
![]() Join Date: Aug 2015
Location: kokomo,indiana
Posts: 334
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Re: Not much Heat, Help
Thanks for the replies
not an ac truck yes, vents are closed goofy question, how do i check the blend doors, i did unhook the defrost/floor cable and just switch by hand, down for floor, up for defrost do i have to take box apart ? also, blower motor has 1 speed , probably just motor, 1 thing i didn't change Thanks
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A Little Better Every Day Cancer Survivor, most dont know what they have until its gone, appreciate everything |
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#6 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Take it a part where the screws are and check inside to see if there any signs of rodents. They love building their nest up inside these. When you have it a part check the flapper by hand.
Just my opinion. I run the hose that comes off the pump to the lower fitting of the heater core and then back to intake. This makes sure there is no air in the system. ![]()
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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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#7 |
Registered User
![]() Join Date: Aug 2015
Location: kokomo,indiana
Posts: 334
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Re: Not much Heat, Help
ok
just took inside box apart, no rodents, lol, flapper was not working quite right, i can adjust tomorrow, the element inside on top of the inside box, how do i know its working right, also would the element not working right mess with the blower speed,more than likely done tonite, gotta work tomorrow Thanks
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A Little Better Every Day Cancer Survivor, most dont know what they have until its gone, appreciate everything |
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#8 | |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,492
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Re: Not much Heat, Help
Quote:
If the coils are not broken or touching each other on the resistor (element) and the connections are tight, it's probably OK. If I remember correctly the low and medium blower speeds go through the resistor and the high speed bypasses it. The switch could be bad. It's on the side of the heater control unit under the dash. If you follow the wires from the resistor they will go to the switch. You can test the switch with a multi meter. If the door on the fresh air side of the heater core is not opening you will not get any heat. Follow the long cable down under the heater box on the right side, and remove the black plastic oval plug. Using a flashlight make sure the cable end is on the pin of the door and the door is opening and closing when you move the control arm on the heater control panel..... 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 - Last edited by LockDoc; 11-25-2019 at 11:48 PM. |
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