Question about 2002 Pontiac Grand Prix

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Heat/ac blower only works on high! - 2002 Pontiac Grand Prix

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  • felixbag Aug 09, 2008

    I have a 1999 Grand Prix with the same problem. The ac only works on the highest setting. When I try the 4 lower settings there is no reponse from the ac plus my daytime headlights go out. This was happening in the winter with the heater also, the lights would also go out.
    Yesterday my husband replaced the blower resistor. And yes the new one did not look like the original resistor. We called parts to make sure we had the correct one.
    Well, that did not help, there is no change.



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My problem started the in a similar way but first the digital information center went blank, then the Fan only worked on 5, the daytime driving lights went next, and then even 5 on the Fan stopped working.

In my case is was the ingnition switch. I know this sounds strange, but I got the information from oher posts on here and had the dealer replace it and sure enough it fixed all of the problem, fan, DIC, and DDL.

It turns out that the ignition switch has all kinds of things routed through it, some that make sense and some that don't.

For me it was not a DIY job, I saw a 10 picture step by step guide on here someone posted and said forget that. It cost me about $350 to have it done by the dealer. The switch was $169 at dealer prices and the rest was labor. They waived the diagnostic fee since I was the one who suggested what the problem might be after they wasted a day scratching their heads. They did waive all of the labor time they put in chasing the wrong problem only becuase I had suggested the Ignitiion Switch on day one, but they did not listen...

Good Luck

Posted on Aug 14, 2008

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The resistor board is failing. If you wait long enough the blower won't work at all. The redesigned resistor board looks much better. The resistor board is next to the blower motor up against the firewall behind the glove box. If you follow the wire from the blower motor you should find it. I couldn't fully tighten the two screws up against the firewall due to the angle.

Posted on Jul 31, 2008


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1 Answer

What is an AC diode fuse? I have a 2006 AWD Pontiac Torrent the AC/Heat doesn't work, I've changed all fuses for the HAVAC and still no AC/Heat blowing out of vents. What could be the problem?

Could be a number of thing's ! Testing the electrical circuit is the way to find out what's wrong . Using a wiring diagram and a DVOM - digital volt ohm meter . Videos on youtube showing how to test it ! Without testing i would only be guessing . Does it work in high speed ? In high speed it by-passes the resistor . If it doesn't work in any speed more then likely the blower motor is the problem !
Air Speed
The HVAC control assembly applies ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
• Low speed--3 resistors
• Medium 1 speed--2 resistors
• Medium 2 speed--1 resistor
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit. The resistor card has a fusible link which, if blown, will require that the card be replaced.

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My Kia Sedona 2012 minivan front heat and ac does not work while the rare heat, ac and defrost works

Are the controls lighting up? dose the blower motor work? If the controls don't light up you may have a control head locked up you can do a reset by unplugging the IOD fuse for 2 mins and then plugging it back in. If the all the lights work in the control head and the blower isn't working try turning the front blower on high and then tapping the motor itself if it works after hitting the motor you will need to buy a new blower motor.

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Ac blower motor stopped working

YJ car.
the blower is dead. is that it?
does it blow full speed on high
do you have 12v on terminal A of blower , term B is 0v ground
got that, then the blower is dead.
if not 12v, then the controls are bad.

page 47
4 parts to make blow
1: fuse 12 good.
2: switch heater /on off.
3: high, med,low speed, use high, its direct.
4: the blower,
one of those points has no 12v on high,
use a simple voltmeter to find the failed point.

Jan 14, 2014 | 1994 Jeep Cherokee

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Blower motor (AC/Heat) only works on High

It could be worn contacts on the HVAC selector switch. It could also be a bad blower motor but I would check the switch first; contacts lose continuity from a lot of use and wear down. both should be able to be had from a junkyard for rather cheap. I would suggest a loose connection but I don't think that is the case here unless the problem were intermittent.

Good luck!!

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1 Answer

Blower for ac/heat only work on lower 3 levels.

Check the blower motor resitor. Use a 12v test light at the switch and notice the bulb brightness change as you switch settings.. Probably have a bad blower resiter.

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