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Heater control switch fault?

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Old 09 Feb 2013, 03:11 pm
Fresh Cruiser
Join Date: Feb 2013
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Angry Heater control switch fault?

Hi, im a newbie to the forum and have a fault which no one seems to be able to trace, when im driving or stationary if i turn on the heater control/fan switch the engine stutters and you feel it driving along as if you ve put a heavy electrical load on it, the car has had a beefier earth lead fitted and does not appear to affect anything else, if i turn of the heater /ac it drives fine, any ideas anyone?
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Old 09 Feb 2013, 04:01 pm
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Default Re: Heater control switch fault?

If you have ruled out the battery cables. I would make sure that you have both speeds on the cooling fan. That checks out clean the IAC valve on the TB. Hope you get it figured out.

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Old 09 Feb 2013, 04:02 pm
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Default Re: Heater control switch fault?

You didn't say what year you PT is. Makes a difference if it's 01-05 or 06+. Sounds like the A/C (compressor) is coming on no matter which way your turning the control knob. If the other knob setting is on defrost, the A/C will come on no matter if you wanted it or not. The compressor does put a strain on the engine and the computer compensates (or suppose to compensate) for the extra power needed with the A/C.
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Old 09 Feb 2013, 04:06 pm
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Location: On Vancouver Island, BC
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Default Re: Heater control switch fault?

Sounds like a similar issue to mine, I wish I would have saw your thread before starting a new one.

Mine pulls down with any electrical, not just fan/AC, is this the same for yours?
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Old 09 Feb 2013, 06:08 pm
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Join Date: Feb 2013
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Default Re: Heater control switch fault?

Hi thanks Busted PT and Crewzin for your replies, its a 2.0 Touring 2003, i will check those items out, my AC does not work though.I am getting it regased soon. Hi Caustic, its just the heater control knob that causes my fault, apart from ive noticed the stop lights make my headlights dim momentarily when i press the brake pedal.
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