My Heater Is Not Blowin Hot???????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

str8sixblazer · 12-07-2008, 02:20 AM

the blower works great,i got a 180 brand new thermostat, the hoses are hooked up, and the heater core aint leaking? any info is appreciated thanks

Huck · 12-07-2008, 09:50 AM

Couple of issues to check---is the hose to the heater core getting hot indicating flow? 2nd--the heater control flapper needs to open to allow air to pass through the heater and into the cab. Depending on if the truck is an AC or Non-AC---trace the cables to see if they are hooked up or broken---start to disassemble the in cab heater ducts to find the air flow blockage. It can and often is a Mickey Mouse House nest in the plastic heater housing which can be a PITA to clean out but must be done if it's blocking air flow.

68gmsee · 12-07-2008, 11:23 AM

Also, could be the heater control valve. The lever is in the heat mode, but the valve is not opening allowing hot water to run through the heater core.

str8sixblazer · 12-07-2008, 01:25 PM

thanks for all the help. but where would the hearter control valve be?

Spray-Bomb · 12-07-2008, 02:42 PM

Also you could have a bunch of leaves or something in your cowl & heater box blocking air flow

And you may have a heater core that is corroded up inside, but check all the other stuff before you replace the core

caminokid · 12-07-2008, 03:26 PM

Or could be like me....pinched hose to the heater core.

Camper Power · 12-07-2008, 03:45 PM

try checking your coolant level, if it gets too low the heater won't work. this happened to me once

12-07-2008, 02:20 AM	#1
str8sixblazer Registered User Join Date: Dec 2008 Location: concord ca Posts: 2	My Heater Is Not Blowin Hot???????? the blower works great,i got a 180 brand new thermostat, the hoses are hooked up, and the heater core aint leaking? any info is appreciated thanks __________________ 68 swb 2tone flat orange and black 72 2wd blazer six banger (project)

12-07-2008, 09:50 AM	#2
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,261	Re: My Heater Is Not Blowin Hot???????? Couple of issues to check---is the hose to the heater core getting hot indicating flow? 2nd--the heater control flapper needs to open to allow air to pass through the heater and into the cab. Depending on if the truck is an AC or Non-AC---trace the cables to see if they are hooked up or broken---start to disassemble the in cab heater ducts to find the air flow blockage. It can and often is a Mickey Mouse House nest in the plastic heater housing which can be a PITA to clean out but must be done if it's blocking air flow.

12-07-2008, 11:23 AM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: My Heater Is Not Blowin Hot???????? Also, could be the heater control valve. The lever is in the heat mode, but the valve is not opening allowing hot water to run through the heater core.

12-07-2008, 01:25 PM	#4
str8sixblazer Registered User Join Date: Dec 2008 Location: concord ca Posts: 2	Re: My Heater Is Not Blowin Hot???????? thanks for all the help. but where would the hearter control valve be? __________________ 68 swb 2tone flat orange and black 72 2wd blazer six banger (project)

12-07-2008, 02:42 PM	#5
Spray-Bomb Texas Big Wig Join Date: Jan 2007 Location: Mineola, Texas Posts: 5,620	Re: My Heater Is Not Blowin Hot???????? Also you could have a bunch of leaves or something in your cowl & heater box blocking air flow And you may have a heater core that is corroded up inside, but check all the other stuff before you replace the core __________________ Just not low enough... ----------------------------- Sinister Killer

12-07-2008, 03:26 PM	#6
caminokid Chevy nut Join Date: Jun 2007 Location: Springfield, Illinois Posts: 2,266	Re: My Heater Is Not Blowin Hot???????? Or could be like me....pinched hose to the heater core. __________________ 84 Chevy Custom Deluxe 1/2 Ton Named Fade To Black II "Remember kids there is NO replacement for displacement!"

12-07-2008, 03:45 PM	#7
Camper Power Registered User Join Date: Feb 2008 Location: Grande Prairie Alberta Posts: 261	Re: My Heater Is Not Blowin Hot???????? try checking your coolant level, if it gets too low the heater won't work. this happened to me once __________________ eh 1970 Chevy C20 daily driver 1975 GMC Jimmy 4x4 project 1966 GMC C10 Dad's project Last edited by Camper Power; 12-07-2008 at 03:46 PM.



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