Thread: Electric Cooling fans behaving strangely

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  1. #1 Electric Cooling fans behaving strangely 
    SE Level Member yekimmrt's Avatar
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    So I've been getting the P0128 for about three years now. I've replaced the thermostat (195) several times, the ECT sensor a few times, the wires to the ECT, tested and replaced the IAT sensor too. The code comes and goes. I've been noticing lately my engine temp running upwards of 240 when I'm sitting still, also. I can rev the engine and usually knock it back down. I had the engine code in, and was checking the resistance again on my ECT sensor and IAT, when I noticed that after I started the engine cold, when it was 30 degrees outside and neither the heater or air conditioner on, both of my electric cooling fans turned on. They didn't turn off until about 180 degrees. I turned the car off, and came out later when the engine was still relatively warm, let the car run, and it ran almost all the way up to 230 without the electric fans ever coming back on. This seems pretty back _sswards to me. I'm not sure where the fans get their input from besides the PCM, and it occurs to me this odd fan operation may be causing my intermittant p0128. Does anyone have any input? I've got a 2001 GTP btw. No mods except K&N air intake.
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  2. #2 Re: Electric Cooling fans behaving strangely 
    Killa Bee Scottydoggs's Avatar
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    your dic has the outside temp? or the climate control? if so is it accurate? if that sensor is bad the car acts all silly with the fans cause it thinks its hot when its cold and vice versa.

    that sensor in in the bumper area of the grill.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: Electric Cooling fans behaving strangely 
    SE Level Member yekimmrt's Avatar
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    My mirror has the outside temp on it, my DIC doesn't. The temp on my mirror is usually accurate within five degrees I'd say. The outside temp sensor affects the radiator cooling fans?
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  4. #4 Re: Electric Cooling fans behaving strangely 
    Killa Bee Scottydoggs's Avatar
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    ok thats sounds good.

    and yes, it can really play with the a/c and heat when it shows -15 and you want a/c but its 85 outside.

    have you checked the relays for the fans, try swapping it with one next to it. maybe they are defective? never know when you got a gremlin.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #5 Re: Electric Cooling fans behaving strangely 
    SE Level Member yekimmrt's Avatar
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    Good to know. So I went to check my relays by swapping the cool fan 1 and 2 relays, but of course they were working properly. Low coming on around 223, cutting off somewhere around 195-205, not sure. But they were working how they were supposed to. I swapped them anyway just to see, no difference. I will wait to try a cold start again and see if I can duplicate the problem, then swap them and see if it makes a difference. If the cool fan 1 and cool fan 2 don't make a difference, I might try and get a new cool fan relay (the black one) and see if that helps. Thanks!
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