Car gets hot with ac lever on cold?

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MrSony

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Nov 15, 2014
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Why?
 

TURNA

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Jul 24, 2009
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It's broke
 
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MrSony

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Nov 15, 2014
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Des Moines, Iowa
Had to type quick. The temp gauge goes over 200 when I have the blend lever on cold then quickly shoots back down to 195 when I put it to hot. Even with the blower off it does this.
 

foxtrot

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Dec 19, 2008
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It could be a simple case of coolant circulation or in other words, reduction of coolant circulation. When the select lever is on 'max cool', the coolant is not circulated thru the heater core. Maybe this has something to do with the observed behavior.. Btw, 200 degrees F is not hot..
 

MrSony

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Nov 15, 2014
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Probably. And by over 200 i mean about 220f from 195. And it does it depending on blend door position, blower lever position or speed has no effect. If the car is on and its on cold eventually ot will read as if its overheating. Within 10 seconds it returns to normal when movinf blend lever to hot.
 

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
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Wasn't you vacuum switch broken?? What did you do to fix it? Maybe something with that has to do with it?
 

pontiacgp

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Mar 31, 2006
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Kitchener, Ontario
Probably. And by over 200 i mean about 220f from 195. And it does it depending on blend door position, blower lever position or speed has no effect. If the car is on and its on cold eventually ot will read as if its overheating. Within 10 seconds it returns to normal when movinf blend lever to hot.

if the temp changes that fast I think you have an electric problem with the gauge
 
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MrSony

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Nov 15, 2014
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Its a "mechanical" gauge. I had another that broke at the temp doodle but acted the same way before it broke. It wouls do it everytime. And my vacuum switch is fine. My problem was I had the source on ported instead of manifold vacuum.
 
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