Any way to make the HEATER, hotter?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cobb_ben · 03-18-2005, 01:52 AM

The heater in my trucks don't blow hot, they only seem to get warm, enough to defrost the windows, but I still "chillin." I put a new heater core and blower on it, but yea....

Anyone have any ideas?????
Thanks Guys

Hopefully tho I won't be needing the heater much more, YEA sping is on the WAY!!!

CbHeEaVsYt · 03-18-2005, 02:16 AM

check your antifreeze if its low that will make it get warm but not hot
and check ur thermostat in the gooseneck

just a few suggestion

cb

TrainD5115 · 03-18-2005, 02:37 AM

If you run a hotter thermostat you should get more heat, but most likely the one you have in there now is probably not working right or like Cheavybeast said your coolant could be low.

raceman6135 · 03-18-2005, 03:05 AM

The heater core could also be plugged.

DJS

Kurt L · 03-18-2005, 07:22 AM

turn your heater hoses around found that works too.
had to do it on mine.

the baron · 03-18-2005, 07:26 AM

Check also your cables moving the flaps in your heating box , or the presence of dust/tree leaves/compost in that same heating box...

I have the same problem on "Ye Old Reliable"

gretzzz ,

the Baron

Mike76251 · 03-18-2005, 08:22 AM

Cardboard over the grill?

PS: Only do that if you know the temp guage is reading right.

cobb_ben · 03-18-2005, 10:12 AM

The thermostat and coolant are good, it's a 195degree. Might try the switching the hoses around. What about putting on a coolant flow control valve? Saw put it on the outlet side and slow down the flow. Mabe this would keep hot coolant in the heater, allowing more heat to transfer out.

Im statring to think that this is just the way the heaters on our trucks are. They just don't get the cab of the truck hot.

beaterC10 · 03-18-2005, 10:15 AM

The heater should get hot if everything is working correctly. What shape is the water pump in?

cobb_ben · 03-18-2005, 11:18 AM

It's good as far as I know. Maby what I am trying to say is I dont think my trucks heat up like these new cars. I can't wear short sleaves in the middle of winter and be comfortable. Now like in one of these new cars you can get in, turn the heat on and have short sleaves and be comfortable. I would like something halfway like that.

Thanks a lot guys

Greenlee · 03-18-2005, 11:53 AM

Quote:

Originally Posted by cobb_ben

It's good as far as I know. Maby what I am trying to say is I dont think my trucks heat up like these new cars. I can't wear short sleaves in the middle of winter and be comfortable. Now like in one of these new cars you can get in, turn the heat on and have short sleaves and be comfortable. I would like something halfway like that.

Thanks a lot guys

I think my trucks heater works better than the heaters in newer cars. Maybe your heater core is bad???

Destructo · 03-21-2005, 01:09 AM

Quote:

Originally Posted by Greenlee

I think my trucks heater works better than the heaters in newer cars. Maybe your heater core is bad???

Yeah, my 85K10 has killer heat, my new chevys heat works quite well also.

I would check to make sure your flaps and vents are working right.

Hemikiller · 03-18-2005, 12:27 PM

All my trucks have such wicked heat it'll about melt your boots. you need to dig into this more....

raceman6135 · 03-18-2005, 07:29 PM

I agree with Hemi. Regardless of the outside temperature here in Calgary, after driving for 15-20 minutes, I'm turning down the fan speed and sliding the heater control partway toward "cool."

My truck is a 1986 C-20 with a 350 engine, BTW.

DJS

Russell · 03-18-2005, 07:44 PM

My 80 with a 350 gets extremely hot as well. Check that your heater ducts are all good, not that there is a big gap in one of them somewhere. Also check to make sure that the heater fan is blowing sufficiently, if there is little airflow, there will be little heat. Also, check to make sure that you don't have air in your heaterbox, that will seriously hamper the amount of heat it puts out. You can fix that by drilling a very small hole in the thermostat, and bubbles will come out of it and into the rad.

GMC1tondually4dr · 03-18-2005, 09:30 PM

Try a light puff of air from the a compressor or air tank thru the heater core inlet. Sometimes they get gummed up with crud and/or rust.

Just a light puff, you could wreck the heater core.

Had to do that on my wife's '98 GMC Jimmy.
It solved the problem.

It will cook you now in the dead of winter, (-20 below or more.)

Just my .02

CCDually

Grim Reaper · 03-18-2005, 10:03 PM

Where are your hoses connected?

The bottom inlet of the heater core should be hooked to the intake. The top port is the outlet and it has to be the top so it will purge air. The return goes either to the Radiator or the water pump depending on the year.
185 degree thermostat. Drop the glove box door and the heat flap is on top. Make sure its opening.

All three of my trucks (2 K5s and a Sub) did fine on heat given enough time since they were SUV's All three will get your feet uncomfortably hot on the coldest day when you dump to the floor.

JustOneTruck · 03-20-2005, 11:46 PM

Had same problem .I checked a few simple things like the coolant and hoses. When my mother in law said it never got warm in the truck either it made me think something was up with this truck. It wasent til I was laid out on my floor and had the glove box down Or open all the way and then some . I see the heater controll solid wire on top of the air box . So I see that it moves to the left to close off the cold air and to the right to open the air. Then I took my fingers and try to see if I could close it farther and their was my cool air or rather my warm air problem solved I adjusted the wire and now I can cook my kids feet with the vent . One screw and a few moments .After all these years.

1984 GMC 1/2 ton long box 6.2L has hot heat in 2005. And my temp gauge always said 190-200 still blew out luke warm air.

03-18-2005, 01:52 AM	#1
cobb_ben Registered User Join Date: Feb 2004 Location: Fort Leonard Wood Mo Posts: 299	Any way to make the HEATER, hotter?? The heater in my trucks don't blow hot, they only seem to get warm, enough to defrost the windows, but I still "chillin." I put a new heater core and blower on it, but yea.... Anyone have any ideas????? Thanks Guys Hopefully tho I won't be needing the heater much more, YEA sping is on the WAY!!!

03-18-2005, 02:16 AM	#2
CbHeEaVsYt Pick up man Join Date: Feb 2005 Location: trenton mi Posts: 135	check your antifreeze if its low that will make it get warm but not hot and check ur thermostat in the gooseneck just a few suggestion cb __________________ heres sum pics of my truck 82 silverado c10 heres my baby 1990 k1500 check out this 1957 chevrolet for sale

03-18-2005, 02:37 AM	#3
TrainD5115 North Coast, baby! Join Date: Jun 2004 Location: Toledo, OH Posts: 437	If you run a hotter thermostat you should get more heat, but most likely the one you have in there now is probably not working right or like Cheavybeast said your coolant could be low. __________________ Brad 79 Scottsdale C20 350/350 3.73's Still running full CA smog gear!

03-18-2005, 07:26 AM	#6
the baron Registered User Join Date: Mar 2003 Location: Liège , Belgium Posts: 263	Check also your cables moving the flaps in your heating box , or the presence of dust/tree leaves/compost in that same heating box... I have the same problem on "Ye Old Reliable" gretzzz , the Baron __________________ 1982 Suburban 2WD , 260ci Olds engine,TH400 , will get a 1979 front clip , might be ready in ... 2016 1985 Chevy Van ( 305/350 ) , "Kellogg" equipped , my actual D.D. 1960 Girl Friend , frame still good , body has some dents

03-18-2005, 12:27 PM	#13
Hemikiller Registered User Join Date: Feb 2005 Location: Killingworth, CT Posts: 30	All my trucks have such wicked heat it'll about melt your boots. you need to dig into this more.... __________________ Wise man once told me; "Don't show me what you know, show me what you don't know" Nothing worthwhile is ever easy Present Stable: 73 C-30 CrewCab Dually 4X2 91 4X2 'burban 89 4X4 'burban 84 4x2 'burban (R.I.P.)

03-18-2005, 03:05 AM	#4
raceman6135 Dino burner Join Date: Nov 2002 Location: Calgary, Alberta, Canada Posts: 602	The heater core could also be plugged. DJS

03-18-2005, 07:22 AM	#5
Kurt L Senior Member Join Date: May 2003 Location: ne florida Posts: 2,665	turn your heater hoses around found that works too. had to do it on mine.

03-18-2005, 08:22 AM	#7
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,499	Cardboard over the grill? PS: Only do that if you know the temp guage is reading right.

03-18-2005, 10:12 AM	#8
cobb_ben Registered User Join Date: Feb 2004 Location: Fort Leonard Wood Mo Posts: 299	The thermostat and coolant are good, it's a 195degree. Might try the switching the hoses around. What about putting on a coolant flow control valve? Saw put it on the outlet side and slow down the flow. Mabe this would keep hot coolant in the heater, allowing more heat to transfer out. Im statring to think that this is just the way the heaters on our trucks are. They just don't get the cab of the truck hot.

03-18-2005, 10:15 AM	#9
beaterC10 Senior Member Join Date: Jul 2003 Location: Indianapolis, IN Posts: 1,277	The heater should get hot if everything is working correctly. What shape is the water pump in?

03-18-2005, 11:18 AM	#10
cobb_ben Registered User Join Date: Feb 2004 Location: Fort Leonard Wood Mo Posts: 299	It's good as far as I know. Maby what I am trying to say is I dont think my trucks heat up like these new cars. I can't wear short sleaves in the middle of winter and be comfortable. Now like in one of these new cars you can get in, turn the heat on and have short sleaves and be comfortable. I would like something halfway like that. Thanks a lot guys

03-18-2005, 07:29 PM	#14
raceman6135 Dino burner Join Date: Nov 2002 Location: Calgary, Alberta, Canada Posts: 602	I agree with Hemi. Regardless of the outside temperature here in Calgary, after driving for 15-20 minutes, I'm turning down the fan speed and sliding the heater control partway toward "cool." My truck is a 1986 C-20 with a 350 engine, BTW. DJS

03-18-2005, 07:44 PM	#15
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	My 80 with a 350 gets extremely hot as well. Check that your heater ducts are all good, not that there is a big gap in one of them somewhere. Also check to make sure that the heater fan is blowing sufficiently, if there is little airflow, there will be little heat. Also, check to make sure that you don't have air in your heaterbox, that will seriously hamper the amount of heat it puts out. You can fix that by drilling a very small hole in the thermostat, and bubbles will come out of it and into the rad. __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

03-18-2005, 09:30 PM	#16
GMC1tondually4dr Registered User Join Date: Jun 2004 Location: Rosemount, MN Posts: 341	Try a light puff of air from the a compressor or air tank thru the heater core inlet. Sometimes they get gummed up with crud and/or rust. Just a light puff, you could wreck the heater core. Had to do that on my wife's '98 GMC Jimmy. It solved the problem. It will cook you now in the dead of winter, (-20 below or more.) Just my .02 CCDually

03-18-2005, 10:03 PM	#17
Grim Reaper Registered User Join Date: Jul 2001 Location: Atlanta GA Posts: 1,704	Where are your hoses connected? The bottom inlet of the heater core should be hooked to the intake. The top port is the outlet and it has to be the top so it will purge air. The return goes either to the Radiator or the water pump depending on the year. 185 degree thermostat. Drop the glove box door and the heat flap is on top. Make sure its opening. All three of my trucks (2 K5s and a Sub) did fine on heat given enough time since they were SUV's All three will get your feet uncomfortably hot on the coldest day when you dump to the floor. __________________ Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project



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03-20-2005, 11:46 PM	#18
JustOneTruck Registered User Join Date: Feb 2005 Posts: 88	Had same problem .I checked a few simple things like the coolant and hoses. When my mother in law said it never got warm in the truck either it made me think something was up with this truck. It wasent til I was laid out on my floor and had the glove box down Or open all the way and then some . I see the heater controll solid wire on top of the air box . So I see that it moves to the left to close off the cold air and to the right to open the air. Then I took my fingers and try to see if I could close it farther and their was my cool air or rather my warm air problem solved I adjusted the wire and now I can cook my kids feet with the vent . One screw and a few moments .After all these years. 1984 GMC 1/2 ton long box 6.2L has hot heat in 2005. And my temp gauge always said 190-200 still blew out luke warm air.

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