ac mod?

I saw this on Facebook.. the guy modded his ac with a resistor to get it to cool better.

Won't this be harder on his compressor?

https://www.youtube.com/watch?v=vMcXWhSB3ms&feature=youtu.be&app=desktop

 

Harder on everything, plus the added bonus for freezing up the evaporator core blocking the air flow.

 

That's what i thought too.. and also it will only cool to the point where the outside temp rises the inside temp also rises.

 

Interesting: Probably a fuel efficiency tweak forcing a/c off; or maybe to protect crappy compressors? originally thought thermistors were used only on automatic a/c systems only.....
The change in resistance probably forces the compressor to run until the low-limit switch in the system (cold return line) forces the compressor off on very low pressure, preventing refrigerant liquid from killing the compressor.
NOt sure if this is a good idea....seem like 51 deg s/b good enough.

 

I've had a few vehicles where the discharge was more like 45ºF - F-150 / Jeep Cherokee / S-10 Blazer. Sure could have used a bit more temp drop on Saturday, it was 115ºF here! Now I'm going to have to unlimber the thermometer and see what this outfit actually runs at.......... Several of our guys have reported installing more cab insulation which would probably help.

I've noticed that the truck seems to be pretty sensitive to throttle position - and killing the compressor for gas savings is one thing - but just flat reducing the system capability is another.

 

i did this to my Jeep Wrangler. definitely a lot colder but did freeze over once when it was insanely humid. I just stuck the resistor into the plug and taped it in place with some electrical tape

Might give this a try on the taco.

 

Toyota has been using thermistors on the evaporator core I know since 1988. I had to replace one on a 88 Camry.

 

update: I was driving up to pismo beach over the weekend and right around 3 hours of driving with Max air ON, everything froze up lol. Also happened on the way home. I'm currently using a 22K ohm resistor.

Might change the resistor to a higher? ohm to hopefully prevent it from freezing up again or just take it out all together till next summer.

 

Told Ya.

Plug the thermistor back in.

 

No, take it out and leave it out.

 

Reason i did the mod cause the stock AC couldn't keep up when it gets over 100F outside. After inserting the resistor it can easily keep everyone inside cool and happy especially the kids. Ill look into insulating the roof to see if that'll help

 

34* vent temp means the evaporator temp is about 24*. It IS freezing up. Freeze it up solid and find out how ice can make aluminum evaporators leak.