I need heater help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70ChevyLongbed · 07-15-2004, 03:11 PM

My heater blows heat into the cab... all the time. I have messed with the controls, which are broken off and behind the dash, and nothing stops the hot air altogether... it just blows less. Is there a way to disconnect/block off/stop the heater? The hoses in the engine compartment are new, but I haven't done anything with the heater or the controls. I don't have A/C and I won't need heat for 5 months or more, but with summer pushing temps into the 90's... I'm baking in there.

Any help would be appreciated.

Oh yeah... I don't think this makes a difference, but here's a little more background...

The PO told me there was a problem with the heater controls so he wired in a toggle switch to turn the fan on and off. This past winter I realized that there was just as much heat coming from the dash area with or without the fan on. I disconnected the switch because it was wired directly to the battery and I was sure I would leave it on and drain the battery.

1971c30 · 07-15-2004, 03:17 PM

I had the same problem. The baffles inside the ducting work are probably broken. All i did was reroute the water away from the heater core. It is a quick and easy fix. Just loop the hot water directly back to the radiator.

70ChevyLongbed · 07-15-2004, 03:28 PM

Thanks for the quick response!

Does that cause the motor to run hotter?

68 Suburban · 07-15-2004, 03:42 PM

There is a valve you can buy at the auto parts store that fits in your heater hoses. It cost about $9.95. You can turn your heat off for the summer, and on for the winter.

stelth2002 · 07-15-2004, 05:26 PM

LOLLOLOLOOOOOOOoo i quickly came up with the solution as chris described.

busterwivell · 07-15-2004, 05:35 PM

Chris' idea is a good one, just be sure you stop the water before the core for best results, instead of after.

grayw0lf · 07-15-2004, 05:57 PM

I have the exact same problem. Also have a toggle switch for the fan control. I just bypassed the heater core.

70ChevyLongbed · 07-16-2004, 08:39 AM

Thanks Guys!

roadking · 07-16-2004, 10:25 AM

can anyone post a pic. of a clean bypass for summer driving.

ACES · 07-16-2004, 11:09 AM

I'm not positive that this is what they are talking about, but here is what was on my truck when I bought it: (top left)

07-15-2004, 03:11 PM	#1
70ChevyLongbed Howzit?!? Join Date: Jan 2003 Location: Maryville, TN Posts: 1,266	I need heater help My heater blows heat into the cab... all the time. I have messed with the controls, which are broken off and behind the dash, and nothing stops the hot air altogether... it just blows less. Is there a way to disconnect/block off/stop the heater? The hoses in the engine compartment are new, but I haven't done anything with the heater or the controls. I don't have A/C and I won't need heat for 5 months or more, but with summer pushing temps into the 90's... I'm baking in there. Any help would be appreciated. Oh yeah... I don't think this makes a difference, but here's a little more background... The PO told me there was a problem with the heater controls so he wired in a toggle switch to turn the fan on and off. This past winter I realized that there was just as much heat coming from the dash area with or without the fan on. I disconnected the switch because it was wired directly to the battery and I was sure I would leave it on and drain the battery. __________________ Jason Hawaiian-J 70 Longbed, 307, Edelbrock Carb 1404, Edelbrock Intake 2101, Dual Roller Timing chain and gears, 214/214 cam, Comp Roller Rockers, dual Flowmasters. 1999 Chevy Tahoe 2004 Mini Cooper S 71 BMW 2002 - Sold

07-15-2004, 03:17 PM	#2
1971c30 Registered User Join Date: Jun 2004 Posts: 8	heat I had the same problem. The baffles inside the ducting work are probably broken. All i did was reroute the water away from the heater core. It is a quick and easy fix. Just loop the hot water directly back to the radiator.

07-15-2004, 03:28 PM	#3
70ChevyLongbed Howzit?!? Join Date: Jan 2003 Location: Maryville, TN Posts: 1,266	Thanks for the quick response! Does that cause the motor to run hotter? __________________ Jason Hawaiian-J 70 Longbed, 307, Edelbrock Carb 1404, Edelbrock Intake 2101, Dual Roller Timing chain and gears, 214/214 cam, Comp Roller Rockers, dual Flowmasters. 1999 Chevy Tahoe 2004 Mini Cooper S 71 BMW 2002 - Sold

07-15-2004, 03:42 PM	#4
68 Suburban Registered User Join Date: Oct 2000 Location: From Chicago, Live in Phoenix, AZ Posts: 6,802	There is a valve you can buy at the auto parts store that fits in your heater hoses. It cost about $9.95. You can turn your heat off for the summer, and on for the winter. __________________ Just sitting here contemplating contemplation.

07-15-2004, 05:26 PM	#5
stelth2002 Young Gun wth Fast Inline Join Date: Jan 2002 Location: Idaho Posts: 1,475	LOLLOLOLOOOOOOOoo i quickly came up with the solution as chris described. __________________ 1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!

07-15-2004, 05:35 PM	#6
busterwivell Registered User Join Date: Jan 2002 Location: Sahuarita, AZ USA Posts: 2,033	Chris' idea is a good one, just be sure you stop the water before the core for best results, instead of after. __________________ Bill - Tucson, AZ 47 Chevrolet 2 dr sedan 56 Chevrolet 210 2 dr sedan 66 Chevrolet Malibu 2 dr 4 speed 71 Chevrolet C30 Longhorn 86 Chevrolet Monte Carlo SS (Sold) 01 Chevrolet Tahoe IM - BUSTERWIVE@aol.com

07-15-2004, 05:57 PM	#7
grayw0lf Registered User Join Date: Apr 2004 Location: Clanton, AL Posts: 1,253	I have the exact same problem. Also have a toggle switch for the fan control. I just bypassed the heater core. __________________ 85' CUCV M1009!!! The newest addition! 6.2diesel, Th400, NP208, & only 36k miles! 70' C-10 LWB Fleetside - Looking good these days! 05' Dodge Neon 88' Winner Escape Sport 1750 - 4.3v6 94' Seadoo SP 84' Honda TRX200, bare nekkid. Just a frame & tires. Always looking for another project or any good deal!

07-16-2004, 08:39 AM	#8
70ChevyLongbed Howzit?!? Join Date: Jan 2003 Location: Maryville, TN Posts: 1,266	Thanks Guys! __________________ Jason Hawaiian-J 70 Longbed, 307, Edelbrock Carb 1404, Edelbrock Intake 2101, Dual Roller Timing chain and gears, 214/214 cam, Comp Roller Rockers, dual Flowmasters. 1999 Chevy Tahoe 2004 Mini Cooper S 71 BMW 2002 - Sold

07-16-2004, 10:25 AM	#9
roadking Registered User Join Date: Nov 2003 Location: kc Posts: 229	can anyone post a pic. of a clean bypass for summer driving. __________________ 71 C10 SWB BLACK AND WHITE 350 CRATE TH350 ENJOY LIFE

07-16-2004, 11:09 AM	#10
ACES Life is a gamble Join Date: Oct 2003 Location: Lee's Summit, MO Posts: 796	bypass valve I'm not positive that this is what they are talking about, but here is what was on my truck when I bought it: (top left) __________________ 1970 Orange CST C-10 w/350, posi, Longbed The torpid artist seeks inspiration at any cost, by virtue or by vice, by friend or by fiend, by prayer or by wine. -- Ralph Waldo Emerson



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