Question about 1994 Nissan Maxima

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Heating when the car warms up we have heat and it really heats but when we stop at a stop light the heat turns cool to cold until we take off again then it goes back to warm . i have replace the water control valve and still have same issue

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Providing the coolant is at the right level, you have an air-lock in the system. Check the rad cap and the hose going to the over-flow tank. My quess is your coolant is just low enough to cause this! Frankster016

Posted on Nov 24, 2008

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Vacuum source to blend doors weak.. usually a check valve is in line to keep this from happening ..along with a vacuum storage bottle that may be cracked and not holding air must have failed or other to cause this .. the doors are switching back to cold air side when you slow

Posted on Nov 24, 2008

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