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| Engineering/Technical Ask technical questions about cars. Do you know how a car engine works? |
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01-24-2008, 11:31 PM
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#1 | |
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AF Newbie
Join Date: Jan 2008
Location: FTC, Colorado
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help blows hot when driving not when stopped
my 88 4runner blows hot air only when above 2200 rpm, below that it is cold 92% of the time. whats with this? i have replaced the thermostat, should i replace or flush the radiator? new heating core? please help with some advice
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01-25-2008, 12:28 AM
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#2 | |
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Professional Ninja Killer
 
Join Date: Nov 2002
Location: Penn Hills, Pennsylvania
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Re: help blows hot when driving not when stopped
I'm not sure how your 4runner is, but many cars use vacuum operated doors to blend air. Engine vacuum would be different at cruise versus at idle. If one of those vacuum doors is faulty it might be blending cool air when it shouldn't.
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Dragging people kicking and screaming into the enlightenment. |
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01-26-2008, 11:14 AM
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#3 | |
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AF -Advisor
 Join Date: Feb 2006
Location: Seattle, Washington
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Re: help blows hot when driving not when stopped
could be an air pocket in the coolant system. Especially if you have a leak that prevents the system from bleeding the air out. (or a blown head gasket)
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