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HEATER

(2001 Nissan Sentra)
in Newark, NJ on March 31, 2010
I TURN ON THE HEATER BUT I JUST GETTING COLD AIR. CAN SOMEONE TELL ME WHAT IS THE REASON OF THIS HAPPENING.
THANKS.
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Popular Answer
There are several possible causes worst case the heater core (radiator) behind the dash could be restricted or plugged up, the heater control cable may not be opening the heater control valve, get a friend to operate the heater control knob from hot to cold cold to hot, look at the rear of the engine compartment for smaller diameter maybe 3/4 of an inch hoses attached to a heater control valve ensure as the heater control knob is turned from hot to cold the valve operates fully.. When you are driving after 10 minutes is the temperature gauge in the middle of its range if it only 25% of the way u the gauge the engine thermostat is "stuck" open and it will not allow the coolant to get hot enough to produce heat in the car.
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