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Topic ClosedAC Thermostat Bypass - Short Cycle
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fwunder View Drop Down
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Joined: 04 Oct 2013
Location: New Jersey
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Posts: 1676 		Direct Link To This Post Topic: AC Thermostat Bypass - Short Cycle
    Posted: 16 Jul 2021 at 6:28am
Got me thinking there OG. Yesterday, it was 97 interior. Skin temp was prolly 120+. Short cycled from get go.

I just turned it on this AM w/74 interior and thermostat set @ 55. Meat locker time. After 5 minutes I'm measuring 43.5 @ AC duct.

The day before when it worked great, It wasn't quite as hot as yesterday. I'm seeing a pattern here. Seems like maybe @ certain high temp it's not working. That's not good.

I had noticed a similar behavior prior to EasyStart ( I think ) so what's going on?

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2014 RPod 178 => MyMods and Buying Habits
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Posts: 5290 		Direct Link To This Post Posted: 16 Jul 2021 at 6:09am
If you let the interior get warm and then set the thermostat as cold as possible does it still short cycle? If so the you might suspect the compressor or Easystart. If not then it's probably the stat.

If it's the stat then you might want to get one with an adjustable temp differential aka hysteresis. Not sure how to wire it in your specific case but the lite W1209 thermostat boards are very versatile and operate on 12v. So all they need are 4 wires, two for 12v power and 2 that provide a contact closure to run the a/c. Fully configurable for heating, cooling, hysteresis, setpoint, and time delay. You can load the the temp sensor remotely and very inexpensive too.
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fwunder View Drop Down
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Posts: 1676 		Direct Link To This Post Posted: 15 Jul 2021 at 7:51pm
Can't seem to find any good answer on this...

I am trying to trouble shoot another AC short cycling issue. I had the problem, replaced thermostat and it went away. Yesterday, ran AC all day no issue. Today AC just short cycles - usual fan comes on, compressor kicks in, cool air blow for a few seconds, compressor shuts down, fan shuts down, unit rests for a minute or two and cycle repeats. Weird problem cuz it has happened before, but only intermittently. I thought replacing thermostat might fix it. Loose wire in control box? Replace control box?

I do have EasyStart but the problem happened before and after EasyStart.

It is not cold air blowing on thermostat. It is not a source voltage problem.

So I am thinking maybe another thermostat gone bad? Can I bypass it and force fan/compressor on? Not sure what wires to jump.
2014 RPod 178 => MyMods and Buying Habits
2008 4Runner Limited 4.0-liter V6
Yes, those are wild ponies dining on grass while dumping tanks!
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