Question about 1997 Pontiac Grand Prix

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Heater fan not working - 30 amp HVAC fuse blows out repeatedly when replaced. Where should I look for root cause? Have dash disassembled, but can't see any bare wires anywhere behind radio/climate controls/ashtray - what else could be causing the fuse to keep blowing out?

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  • 198 Answers

Try unplugging the blower motor, heater control unit and blower motor resistor. Replace the fuse then reconnect the items 1 by 1 and see what pops the fuse.

Posted on Oct 19, 2013

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Posted on Jan 02, 2017

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SOURCE: No parking lights, fuse keeps blowing.

There is a ground not connected or a wire open that is causing it to blow

Posted on Mar 08, 2009

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SOURCE: heater fan blowing intermittently or not at all

Most likely it does, if you can hit the motor and it will run. I can't say for sure but you might want to chk. to see if you got a heater blower motor resister. There located (if its got one) around the heater motor and it controls blower speeds, might be worth checking out.

Posted on Jan 31, 2009

motor1258
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SOURCE: 89 firebird blows fuse that powers fuel pump and ecm?

That joint & where wires separate, would be a good spot to use a clamp on amp meter, if you have, or know someone who has one, then you could get reading on each one, and zero in on one(s) with most draw.

Posted on Apr 01, 2009

  • 3600 Answers

SOURCE: heater fan blowing intermittently or not at all

unhook your battery unplug the harness that's touchy get a sharp object that you can pry the connectors together with you will see them wide open crimp then tight enough to get a good tight fit, the amperage draw from the motor has stretched them out and when it gets warn with current passing threw it opens up and loses contact. while it's apart take a emory board and clean the flat spades on the other side so you have a good connection.

Posted on May 30, 2009

  • 70 Answers

SOURCE: 1997 Bonneville SSE, when the heater is turned on, only cold air

you may have a failed blend air door motor/actuator. this part will regulate the amount of air from the heater core depending on the temp setting on your electronic climate control unit. if it has failed, it will be stuck at the temp that it was last set at when it quit working. it is also possible the heater core may be plugged up, but using the gm recommended dexcool coolant and flushing it out every 5 years, it should not be plugged up. you can pull the 2 heater hoses off the heater core on the passenger side of the engine compartment firewall and see if the heater core is the problem. caution-do not use a high pressure air hose to blow through the heater core as this could damage it and cause a leak!

Posted on Oct 28, 2009

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HEATER NOT WORKING ON 03 YUKON


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How do i replace the fan motor and where is it located?


wow, 3 fans in car and we get to guess,why.?
first what are you doing.? (guess,i want cab heat to blow?)
parked key off?
hot engine wanting heat from HVAC vents
? what?
or under hood and radiator fans are dead but overheated.

HVAC is a blower fan,or blower, the fuse is called blow.
does blower sound ok on high???? SouND?
if yes (if no controls are bad)
is air flow weak. yes. that is dampers failing
both the blower and dampers and heater core are in the center
tor right(usa) of dash in hugh black box.
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then scan the car. yes, you must scan it see HVAC errors
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some models have filter and packed up ,my block air flow
some have it others dont,. not fun finding it.
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Heater system


There are three fuses involved, all of which are in the fuse box in the dash.
15amp radio hvac powers the control module on the dash.
10amp hvac also powers the module.
30amp high blower fuse powers the blower motor only.
Check your owners manual for details.

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My bmw 318 is blower fan not working


Blown Fuse
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Bad Blower MotorIf the fan only works on setting number 3 or 4, or just on the highest setting, it is most likely that your blower motor is failing and is about to die. Use a voltmeter to test the amount of voltage at the blower motor connector with your ignition on and AC running. If it reads 12V, the motor needs replacing.Automatic Climate Control SystemAnother thing that causes the blower fan to malfunction is the Automatic Climate Control System (ACCS). If the ACCS's settings are off, it may cause the fan to stop working. If it is the climate control on the car, typically it is a bad thermostat or electrical circuit that is the culprit.
hope this helps, James Booth

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