2004 Chevrolet Impala Logo
Posted on Jan 06, 2010

Would the heater control valve malfunctioning make the engine overheat blowing hot air out the heater one moment,then not blowing the hot air, temp gage spikes 225 plus. The motor takes awhile to heat up while sitting, once driven down the road it will over heat.

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04 chev epica suddenly only blows cold air coolant level good fan works good and will change from heat defrost and floor properly just only blows cold

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Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged radiator...Insufficient air flow due to possible fan problem...External coolant leak...Make sure fans are operting properly and have cooling system pressure tested for leaks...Gaining and losing heat on the inside of the vehicle usually means system is low on coolant but you must find out where coolant is going

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No the heater control valve will not make your vehicle overheat.
however you might want to replace your thermostat.

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Click this link below and go through the troubleshooting procedure to take care of the problems: ----



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http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
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http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
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http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Please take a moment to rate my answer.........Thanks
7helpful
2answers

2003 Grand Prix not blowing hot air. Does the heater coil need to be replaced? If so where is it located?

If the heater coil was bad, it would be leaking radiator fluid... probably into your dash/floorboard (depending on where it is installed in your model car). There is a switch that diverts the hot radiator fluid through the heater coil when you want heat. There is also an air diverter valve that helps to mix the hot and cold air. The fluid valve is controlled by the A/C settings control. The one that you use to choose between heater/air conditioner/vent/ defrost. The air diverter is controlled by the temp mixing controller. The most simple explanation is that one of those valves or the controller of one of those valves is not working. If the hot water cant be diverted through the heater coil, the coil can't exchange the heat (warming the air). If the air diverter (hot/cold controller) cant move to add heat, then all you will feel is air from the vent side (from outside) or from the A/C cooling the air.

I would guess that its either a controller or one of the valves themselves. Odds are, it is a controller. That tends to be what malfunctions first.
0helpful
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Does the thermostat control the temp of the air blown by the heater?

It controls the engine water temp so if engine temp low it won't blow hot air
Heater water pipe has an inline control valve that controls heater temp either vacuum controlled or by cable to dash control
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Engine overheats when heater pipes connected

I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.
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