Question about 1997 Pontiac Grand Am

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My 97 grand am

We had heads done and heater coil put in and now it keeps blowing fuses and cant use heat or air. if you cut any of these on the fuses blow

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  • grobbie20 Aug 29, 2008

    this was very helpful. we have been trying different things to get it fixed.

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  • 182 Answers

When the heater coil was installed a wire has gotten a bare spot and is shorting out.You should check around the heater coil.

Posted on Aug 25, 2008

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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.

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your description ends. what have you put in...
if you have put stop leak in the car it can clog your heater core.
check your thermostat
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Generally this condition is the result of coolant loss, or failed thermostat. If coolant goes below cylinder head level, or thermostat remains closed,heat will stop working. Do not drive with this condition as excessive heat buildup in cylinder head can and will do serious damage to heads and or head gasket.
Find out where leak is and correct it. Change thermostat as it may also be damaged. Check for excessive steam from tailpipe or miss in engine, as these symptoms indicate a cylinder head problem.

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