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Old 09-30-2015, 04:45 PM
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AC high pressure switch

New challenge in tracking down my cooling fan not coming on when the AC is turned on. I found that the high side AC switch signals the PCM for the fan, so I am wanting to replace it. This is the switch that is in the discharge line between the compressor and the condenser. My switch is square with 3 terminals (looks like a square 4 terminal connector with 1 blank space). I have been through all my local auto parts stores and even a dealership and they are all coming up with a switch with 2 terminals and a completely different plug than what I have.

I looked at a switch for a 2002 (they call it a transducer) and it appears to be what I have. Of course that is 3x the cost of the switch that everyone has listed.

Anyone have any experience with this? I think I'm just going to get the 2002 switch and give it a shot.

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Old 09-30-2015, 09:58 PM
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Re: AC high pressure switch

Similar issue to yours it seems:

A/C low pressure switch

Here's the part number: Genuine Chryslerar Valve A/C Pressure T Part# MOP-5073617AA

If you search 5073617AA on E-bay there's one for $69.00 free shipping. Not sure if it's Mopar or not. But that's not too bad.

You may have a transducer. Is this the original engine in your vehicle? Maybe you have an 02 model but due to manufacturing date it's technically 01. Anyways I hope this helps! Good luck!
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Old 10-01-2015, 02:13 AM
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Re: AC high pressure switch

Older WJ 's use a low and high pressure switch, while newer ones have a pressure transducer. Your jeep was most probably made during that transition period. Since your AC compressor still cycles, it seems that the transducer still works.
Do you get cold air from the AC? Any change while driving?
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Old 10-01-2015, 01:17 PM
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Re: AC high pressure switch

Quote:
Originally Posted by Frango100 View Post
Older WJ 's use a low and high pressure switch, while newer ones have a pressure transducer. Your jeep was most probably made during that transition period. Since your AC compressor still cycles, it seems that the transducer still works.
Do you get cold air from the AC? Any change while driving?
Mine has both the low pressure cutoff (on the accumulator) and the transducer. It appears that the transducer serves two functions - high pressure cutoff and signal to PCM for the hydraulic fan.

When I was attempting to charge my system last weekend, my high side pressures got over 300 and I had no cold air and no cooling fan. I installed a new transducer last night and proceeded to charge the system. As soon as my high side got to 200, the fan started picking up speed and I immediately got a reduction in my vent temps. Continued to push R134 into it and got my low side up to about 40 and high side settled at about 225 and the fan was moving full speed at that point and I got nice 42 degree air when the ambient temp was 95.

According to my data tag, my build date was 08/2000. That seems early in the 2001 production year to have a transition. But now I know that I may need to look at model year 2002 sensors for certain things.

Thanks for the help everyone!
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