papa tiger

I found my radiator fans ran nearly all the time then and were very irritating like at the drive thru speaker, couldn't hear a thing or be understood. Believe the dark trucks have a lot more trouble than light colored ones.

digitaltrucker

I have a dark color truck and while I understand what you are saying about color, if the evap coil is not performing as designed (36-38 degrees), it does not matter what color your truck is. IMO.

In the donor truck I have spoken to in other posts, the unit was cycling 44-48 degrees. In Houston, that is not going to get it in our high humidity and temps. Having installed the pot switch, we have lowered the discharge temp from the 44-48 to 39-42. This is a huge difference believe it or not.

redneck wrencher

I can believe it. Even a degree, or two, makes a big difference with our Gulf Coast humidity. Just dropping the thermostat on my home a/c a couple of degrees can make it feel down right chilly.
I have been blessed with great a/c on all my Ford vehicles. It may take several minutes to cool down on a hot summer day, but you'll be reaching to turn it down when it does.

black5liter

What kind of pot should I order? I'll have to hop on amazon to get it and wire it in that way.


Our local radio shack closed down so I don't have that convenience anymore.

digitaltrucker

This is the description of the one we are using on the donor truck:

1 MEG OHM Potentiometer, 2 watt, 1/4 inch diameter shaft

NOTE: You dont need 2 watts,1 watt or 1/4 watt will work

3kushn

In an earlier post there were pictures of the resister soldered to wires and the end of the pigtail were pins soldered to push into the plug.

Can someone tell me the size of the pins and where they can be found?

Oh and one more thing. I saw the spec of the POT but not that well versed. Is there a link like Amazon to purchase one of these?

RLXXI

This will work, https://www.radioshack.com/products/...lbMaAkYU8P8HAQ
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LariatInTheMud

Did anything more come of this? Mine did the same thing when inserted the resistor in the plug, started blowing hot air. Started with 360K but did not have much change so went down to 270K and ac started blowing warm.

digitaltrucker

Nope, working with a pot switch in dialed in around 348 I believe. Most of the time it works well, sometimes it works OK.


Make sure you are making good contact. 270 is going to be way too low.

Engineer Guy

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With Temps on this just-completed ~7,000 lb. Bumper Pull Trailer Towing Trip over 6 Weeks peaking at ~106 F, my 2014 A/C with a ~500 K Ohm Pot got a good seasonal workout. This Hack is working well, and I observe some of the irregularities that others do. Like, the A/C blowing warm, etc.. Last Season, I chalked that up to pushing the Setpoint Temp 'too' low. Turning the A/C OFF for a few Minutes, and back ON, seems to reset 'things' to normal operation.

The lowest Pot setting I dial down to is about 1/2 the Pot value [~250 K Ohms], and I do that for only a limited time period [~2 Minutes]. Indeed, a few Ice Chips blew out the Vents yesterday when chowing some Ice Cream while stopped Road-side. I assumed this happened because we were stopped, so I dialed up the Pot value pronto. I really like the variability of an adjustable Pot.

Air movement. Humidity. Whether Cab Air is being Recirculated or not. All those Variables come into play. Thus, the optimum Pot Value also changes per changing conditions. My current, calibrated low Temp Readout is the back of my Hand. Literally. I now know what I can get away with. Further, I use the MAX A/C setting only when cooling the Cab. Otherwise, Ice might form.

Yah, I shouldn't have to muck with all this. My own Learning Curve has erased all the operational mysteries, IMO. Given the givens, I'm happy...

Thanks to all!
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