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Post Info TOPIC: Heat issue in the Tahoe
TINY


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Heat issue in the Tahoe
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I know im the mechanic but i got a wierd problem with my truck heat will work fine go over a bump and it gets cold hit another bump and it works again!confuse Help I think it might be the by-pass valve before the heater core but I have never seen one fail before?

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4SPEED427


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What year is it? Seems to me it's a Vortec?

By chance is there a bad connection on the actuator motor for the temperature? Just a guess.

It sure sounds like it will be a weird electrical problem, in my best estimation as a parts guy!!!

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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4SPEED427


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When it's stuck in the cold mode have you pulled over and grabbed the heater hoses to see if it's still circulating?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
TINY


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the hose are hot and as soon as I grab that vavle the heat works again. It is vacuum operated



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4SPEED427


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Ok, that theory is shot!

It's sure not a part I ever remember looking up or selling.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
73SC


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My Suburban had intermittent heat a few winters back but it was a blower motor coming and going. Dug into the dash and found the connector to the blower motor was melted and loose. Spliced in a new connector and its worked fine ever since.

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Ray White, Toronto ON

Formerly - The one and only 1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

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Beaumont4008


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Check the vacume  line for a crack.

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TINY


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Carl Stevenson wrote:

Ok, that theory is shot!

It's sure not a part I ever remember looking up or selling.


Thats what has me puzzeled never seen this problem before every thing else is ok the blower motor is fine, thermostat, mode doors switch, im at a total loss I ordered the valve only $25.00 dollars just not 100% it is the problem.no

 



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4SPEED427


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What about putting a pipe in to eliminate the valve and try it that way? If it's the valve I'm thinking of, it's only there to shut off the hot water to the core when the A/C is on.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
cheetah 427


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could be the nut behind the wheel????

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TINY


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Are you calling my wife a nut! LOL

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4SPEED427


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He wouldn't if he knew she's the queen of demo derby...

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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cheetah 427


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lol was just pulling your leg , didnt know i was pulling hers lol soon summer will be here and you wont need heat, not soon enough, good luck with the repair, ron

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