Heater don't work and it's gettin' chilly - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Benelli · 09-14-2010, 07:12 PM

Just replaced the heater core and still no heat, it look practically brand new. What would cause a heater to not work? Pleae give me some places to start.

Thanks

gregg72340 · 09-14-2010, 07:14 PM

This may sound like a stupid question but are all the cables attached to the control unit and where they lead to?

motornut · 09-14-2010, 07:43 PM

feel the hoses going to the core do they get warm,did you burp out the air?
when you say it looked new,did you put one in or it looked ok?did you try flushing just it with a hose,even while in truck.there are air lines to the controls that require vacume to work

Benelli · 09-14-2010, 10:38 PM

A line had a clog in it, replaced the line and it works now.

Thanks for your help

09-14-2010, 07:12 PM	#1
Benelli Watchin the rust grow Join Date: Oct 2008 Location: Western Nebraska Posts: 950	Heater don't work and it's gettin' chilly Just replaced the heater core and still no heat, it look practically brand new. What would cause a heater to not work? Pleae give me some places to start. Thanks __________________ 1979 Chevy K10 (H/D Front end) - 350 w/ Holley Truck Avenger, Weinald Intake manifold, headers, bored .060 over, mild cam, Built up TH350 (TranStar Shift kit) with a part-timed NP203 t-case SOLD ($3,000) 1997 Chevy Silverado 1500 - 4.3 vortec, extended cab, 21 highway MPG, stock. "Red" SOLD ($3,000) 1987 Toyota 4wd Pick-up - work in progress, future DD SOLD ($1,850) 1998 Dodge Ram 2500 Cummins 5spd Quad cab - old 12 valve with some work done 2004 Chevy Silverado - Black, 4x4, 5.3L, stock for now Underneath that rust is a heart of gold

09-14-2010, 07:14 PM	#2
gregg72340 Registered User Join Date: May 2010 Location: ambler, pa Posts: 325	Re: Heater don't work and it's gettin' chilly This may sound like a stupid question but are all the cables attached to the control unit and where they lead to? __________________ Just would like the snow to stop so I can actually work on my truck!!!!!!!!!!!

09-14-2010, 07:43 PM	#3
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: Heater don't work and it's gettin' chilly feel the hoses going to the core do they get warm,did you burp out the air? when you say it looked new,did you put one in or it looked ok?did you try flushing just it with a hose,even while in truck.there are air lines to the controls that require vacume to work Attached Images __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 Last edited by motornut; 09-14-2010 at 07:52 PM.

09-14-2010, 10:38 PM	#4
Benelli Watchin the rust grow Join Date: Oct 2008 Location: Western Nebraska Posts: 950	Re: Heater don't work and it's gettin' chilly A line had a clog in it, replaced the line and it works now. Thanks for your help __________________ 1979 Chevy K10 (H/D Front end) - 350 w/ Holley Truck Avenger, Weinald Intake manifold, headers, bored .060 over, mild cam, Built up TH350 (TranStar Shift kit) with a part-timed NP203 t-case SOLD ($3,000) 1997 Chevy Silverado 1500 - 4.3 vortec, extended cab, 21 highway MPG, stock. "Red" SOLD ($3,000) 1987 Toyota 4wd Pick-up - work in progress, future DD SOLD ($1,850) 1998 Dodge Ram 2500 Cummins 5spd Quad cab - old 12 valve with some work done 2004 Chevy Silverado - Black, 4x4, 5.3L, stock for now Underneath that rust is a heart of gold

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