Auxfan turns OFF when A/C is ON

**jick.cejoco** · February 26th, 2018 10:33 PM

There are four enable criteria for your auxilliary fan operation:
1. ECT (engine coolant temperature sensor)
2. VSS ( vehicle speed sensor)
3.A/C request switch
4. Refrigerant pressure switch.

Most of these enable criteria inputs can be verified using a good quality scan tool and most will display a diagnostic trouble code. Scan the PCM first. Don't be a blind parts replacer.

**jick.cejoco** · February 26th, 2018 10:38 PM

Originally Posted by ax30g

Had my aux fan checked yesterday. Sira na dw yung module kaya they suggested na iderecho nalang sa fan yung supply ng kuryente. Safe ba yun?
dba masisira kaagad yung fan ko? Parang di ako convinced sa sinabi ng electrician since 4 mos palang yung bago kong fan.

Is it safe na iderecho nalang sa sa fan yung supply ng kuryente?

TIA

A very BOLD sign your mechanic is not even a mechanic and of course too far to be called a technician.
Good indication of mastery of incompetence

**ax30g** · February 27th, 2018 12:29 PM

Originally Posted by jick.cejoco

A very BOLD sign your mechanic is not even a mechanic and of course too far to be called a technician.
Good indication of mastery of incompetence

Yeah nga eh I was quite disappointed dun sa sinabi nya. Anyway, I'll try to bring it sa Rey's sa Marikina para macheck nila and hopefully makita kung saan talaga ang sira.

**ax30g** · February 27th, 2018 12:49 PM

Originally Posted by jick.cejoco

There are four enable criteria for your auxilliary fan operation:
1. ECT (engine coolant temperature sensor)
2. VSS ( vehicle speed sensor)
3.A/C request switch
4. Refrigerant pressure switch.

Most of these enable criteria inputs can be verified using a good quality scan tool and most will display a diagnostic trouble code. Scan the PCM first. Don't be a blind parts replacer.

Correct me if I'm wrong, sa case ng auxfan ko it's either relay/switch or sensor lang nmn sira jan dba?

**nasa.jpl** · February 27th, 2018 12:57 PM

Try NAA (North American Automotive) along Pasig Boulevard across Rizal Medical Center. Had them diagnose my former Fiesta's overheating issues before and the mechanics are way better than others I've been to. Lots of Ford cars getting serviced there as the place was put up by a former Ford Philippines mechanic.

**ax30g** · February 27th, 2018 03:31 PM

Originally Posted by nasa.jpl

Try NAA (North American Automotive) along Pasig Boulevard across Rizal Medical Center. Had them diagnose my former Fiesta's overheating issues before and the mechanics are way better than others I've been to. Lots of Ford cars getting serviced there as the place was put up by a former Ford Philippines mechanic.

Ok. thanks bro! yup andami nga jan Ford Expert kuno pero sablay din nmn gawa.

**jick.cejoco** · February 27th, 2018 05:51 PM

To make it easier for you:

P481 Cooling Fan Relay 2 Control Circuit DTC

**kisshmet** · February 28th, 2018 10:28 AM

Originally Posted by ax30g

Can you give me a background on inverted logic?

All I know is the moment I bought the aux fan, sinaksak ko lang yung source ng kuyente. Never ko nmn ginalaw yung connections sa old fan ko bigla nalang nagoverheat. I've been receiving suggestions like check your thermostat, your relay and first time marinig yung inverted logic.

Sorry for being such a NOOB on this.

BTW, my car is a ford escape.

Baligtad ang logical operation ng aux fan mo..dapat bubuga ng hangin ang fan mo kapag nagsindi ka ng aircon at stationary ang sasakyan mo kasi iinit ang condenser mo

Aandar din dapat ang aux fan mo kapag uminit ang radiator ng sasakyan mo

So the logical operation ng aux fan mo ay OR.. kapag uminit ang condenser the FAN should be ON..kapag uminit ang radiator the fan should be ON..kapag sabay uminit ang condenser at radiator ng sasakyan mo dapat ON ang fan

Titigil lang ang FAN kapag lumamig na ang condenser at radiator mo..hindi dapat tumigil ang fan kapag mainit pa ang condenser OR radiator dahil delikado para sa sasakyan ang sumobra ang init ng radiator OR ng condenser kasi tumutunaw ng bakal ang init

Radiators and condensers are made of aluminum tubes at aluminum fins

Additionally, its not a good idea to keep the fan ON ALWAYS kasi it will wear your aux fan quickly

Kapag tumatakbo na ang sasakyan yun hangin sa harap tatagos sa radiator at condenser fins. Para ka ng may extra fan sa harap ng sasakyan mo. That will help cool your car so the aux fan can rest and prolong its service life
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**ax30g** · February 28th, 2018 10:34 AM

Originally Posted by jick.cejoco

To make it easier for you:

P481 Cooling Fan Relay 2 Control Circuit DTC

Thanks for the info

**robot.sonic** · February 28th, 2018 10:37 AM

Originally Posted by kisshmet

Baligtad ang logical operation ng aux fan mo..dapat bubuga ng hangin ang fan mo kapag nagsindi ka ng aircon at stationary ang sasakyan mo kasi iinit ang condenser mo

Aandar din dapat ang aux fan mo kapag uminit ang radiator ng sasakyan mo

So the logical operation ng aux fan mo ay OR.. kapag uminit ang condenser the FAN should be ON..kapag uminit ang radiator the fan should be ON..kapag sabay uminit ang condenser at radiator ng sasakyan mo dapat ON ang fan

Titigil lang ang FAN kapag lumamig na ang condenser at radiator mo..hindi dapat tumigil ang fan kapag mainit pa ang condenser OR radiator dahil delikado para sa sasakyan ang sumobra ang init ng radiator OR ng condenser kasi tumutunaw ng bakal ang init

Radiators and condensers are made of aluminum tubes at aluminum fins

Additionally, its not a good idea to keep the fan ON ALWAYS kasi it will wear your aux fan quickly

Sent from my GT-P3110 using Tsikot Forums mobile app

Possible na may nabaliktad na polarity sa pag wire?