guys i need help. i have a 93 cummins and i am in need of a temp switch for the low side on the AC . i have read everything that is on here about it. i really dont want to bypass it if i dont have to. i would like for it all to work right. anyway i am more of a visual kinda dude not a read and try and go do it. so my question is there anyone that knows where i can get one or does anyone have one? i have two different pat numbers e56-1101-016 and 56005783. this is my first time posting and i just became a member.

thanks for any help at all
Tim

 

Do you mean the temp sensor that's part of the expansion valve on the firewall? Or do you mean the low pressure switch that is either screwed into the expansion valve or into the low side line coming out of the expansion valve. The low pressure switch is in series with the electric clutch on the compressor that keeps the compressor from running if there is not enough pressure in the low side indicating non enough freon.

 

the temp sensor mounted on the expansion valve. it has a temp probe and goes into a box the has 3 wires coming off of the box. that my not be my issue but i have done everything else. what its doing is the clutch is like going into freak out mode. really lrrgular.

 

I'm not familiar with that one. If you have a wiring diagram you can jumper the pins that are in series with the clutch and see if the problem changes or goes away. Same for the low pressure switch.

 

Could be a relay on a bracket on the expansion valve hose connector.

 

Sounds like the cycling switch. It turns compressor off and on to prevent freeze ups.
Mopar part #56005783 according to an old post.

 

Yes I believe that's what I need. Just trying to find one. I have looked everywhere and can't fine it

 

I would guess they were discontinued being a dodge. You can take any electronic Cycling switch of similar construction and use it- maybe change the connector.
That or a used one, or search for a NOS. I thought Jim Lane tried to rig up a way to replace it with some simple relays and logic. Never understood if it worked... I know the part which goes against the suction line is just a thermal couple. They give temperature to test it in the manual. If the TC is bad, you can make one... relay/controller... that might be easy to fix.
Mine is modified with a shunt resistor to move the temp range down a bit. Thought the factory setting of 50-55 was too high.

Michael

 

The cycling switch has been discontinued, and with all the research I've done, have not been able to find anything... Even NOS. I have been contemplating rigging one up from another Dodge, "four seasons" makes one for (I believe) older caravans and the like, that looks very similar and shouldn't be too terrible to make work. I just haven't been willing to pull the trigger (about $60 trigger) to test it out. I just wired a relay in for now.

 

Just checked my notes from 2014. I found the correct expansion valve at a local Carquest. Should've bought two, cause shortly after they closed down. The part number is #207369. They were the only ones that seemed to find the correct one. All others, including the local Dodge dealer, kept giving me an H-valve with the switch on the drivers side, which won't work cause it collides with the climate control fan housing. The correct one has the switch tucked in the passenger side of things.
Hopefully Carquest is still around in your areas.

 

I looked up the Napa part number.

TEM207369. expansion valve

 

First, are you sure it's full of refrigerant? That is the first thing to check. If it is I would try putting a voltmeter in the AC clutch circuit at the compressor. If you have voltage and ground and the clutch isn't engaged you have a faulty clutch coil. If the voltage and ground cut out I would put the voltmeter at the low pressure cut out switch screwed into the H valve. If that stays constant then put the voltmeter in the cycling switch and check. The switch does cut the clutch out to prevent the evaporator from freezing but should not remain off for long.

If this turns out to be your problem you could source one from a U Pull It yard, any of the gasoline variants with the same connector should work. You can probably look at B vans, Dakotas, minivans and other early passenger cars from the 80's and early 90's as well to source the part from.

 

NAPA shows this switch for an 1980 Dodge Aspen part # TEM207542. I don't know if it totally matches up but it would be worth taking a look at.

 

Yea, all the electronic catalogs are messed up on the H-block. I tried last year to track it back and corrected... none of the database guys would call me. I would look up a p/n by my truck. The p/n it gave had a product discription which was "94-2001" dodge truck. As stated here, you just need to go earlier. Look it up for an 1985 and it will go to a 1979-1993 dodge truck. Years maybe wrong, but idea is correct. Hope it helps.
There are picture guides and there is 100s of H-valves with varying superheat.
It's a 1.7 Ton H-block which is interesting... lot of power to cool down quickly compared to your house.

 

Was just on partsgeek's site, and they have them in the Four Seasons brand for like $25.

This would be for the expansion valve H- block, not the switch.