Question about 1997 Chevrolet S-10 Pickup

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Heater wont blow warm air when hood is closed

Everytime i open the hood the truck immediately starts blowing hot air, the second the hood is closed it turns to cold air....any ideas at all??? its getting cold up here in maine

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Is something being pinched. A wire hose etc. if none of these works I recommend an exorcist.

Posted on Nov 03, 2008

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1 Answer

Dose not blow hot air


Start with the coolant level in the radiator.
Although the car may not ever run hot, the heater is higher than the water pump, and any air caught in the cooling system can cause the heater to stop working.
Your cooling system should be full of coolant.
Next, the thermostat of the engine could be stuck in the open position, which will not allow the heater to put out warm air.
If you car has a dash gauge that reads the engine temperature (I do not think it does), you can tell if the thermostat is stuck open by the fact the gauge stays cold, or nearly cold, all the time.
Finally, the valve under the hood that opens or closes to allow the hot coolant to flow from the engine to the heater may not be opening and closing properly. Most of these valves are vacuum controlled from the dashboard controls.
God bless your efforts.

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Why would my fan blow but not blow hot air?


Locate the heater hoses and feel for temperature.Should be warm to the touch.
There may be an external heater control valve next to the firewall that is either vacuum or cable controlled.
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If the vacuum to the valve is ZERO,it should open.
If the heater control vacuum hose is leaking air,you should get hot air ALL of the time.
people in the winter want heat NOW. Bypass the heater valve,under the hood with a section of copper or plastic tubing.
Even if the heater core is partly plugged up,you will still get some heat.
If the control valve is stuck closed: NO HEAT.
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I had the same problem with my Lincoln. If the heater valve fails open, it tries to heat the car. This is not the fault of the A/C. To test, when the van engine is cold, start the van and the A/C immediately. If the A/C air is cold, then your temperature control valve is stuck in the open position.
Replace it.
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1 Answer

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