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Has anyone seen this [AC]

 
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  • 1 Post By LionPT
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Old 16 Jun 2016, 04:28 pm
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Default Has anyone seen this [AC]

Tues I took a 3,5 hr trip north into southern Georgia.
3 hr in and a half hour out of town, my AC quit blowing air.
The fan/blower was working but no air [warm or cold] was coming out any vents. No air for 30 mins was "tough".
Stop by an old shop and they looked under the hood and said the pipes were frozen.
I was pretty sure the freon hadn't frozen in the tubes and was blocking flow.
This was the general "gist" he was telling me.
Easy solution, if so... turn off the AC for 10 min and let the 90+ day sink in.
sure enough the air started up coming out of the vents again.

I've made the same drive in the same temps before without any incident, so what happened?
Out of boredom, I'd played with the recirculate and fresh air knob.
I seemed to have iced over the evaporator with the extreme humidity from outside and completely blocked the air flow.

Once the ice melted everything is back working fine.
I know I've used the same setting in other cars out west for [ever] without freezing the system up.
Is this common here on the east coast?
I came home without any problems, but I also left the switch in recycling mode.

[new one on me this time]
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Old 16 Jun 2016, 05:05 pm
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Default Re: Has anyone seen this [AC]

Car AC Lines Freezing Up? Here's What You Can Do About It
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Old 16 Jun 2016, 05:15 pm
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Default Re: Has anyone seen this [AC]

When my A/C froze up two times it was because of a bad recycling switch otherwise known as the Low Pressure Switch. It's located on top of the accumulator and is easy to replace. When it goes bad, it doesn't "recycle" the compressor so it never turns off and eventually freezes things up. Turning on the heat or just letting the car run without the A/C will eventually unfreeze it and things will run normal for awhile until it freezes up again while using the A/C.

The recycle/low pressure switch only spits out a tiny bit of R134A while your replacing it. Take off the electrical connection and unscrew the switch. There's a tiny "O" ring on the threads of the switch so don't over tighten it when you put on the new switch.

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Old 16 Jun 2016, 08:11 pm
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Default Re: Has anyone seen this [AC]

Quote:
Originally Posted by CREWZIN View Post
When my A/C froze up two times it was because of a bad recycling switch otherwise known as the Low Pressure Switch. It's located on top of the accumulator and is easy to replace. When it goes bad, it doesn't "recycle" the compressor so it never turns off and eventually freezes things up. Turning on the heat or just letting the car run without the A/C will eventually unfreeze it and things will run normal for awhile until it freezes up again while using the A/C.

The recycle/low pressure switch only spits out a tiny bit of R134A while your replacing it. Take off the electrical connection and unscrew the switch. There's a tiny "O" ring on the threads of the switch so don't over tighten it when you put on the new switch.

Same thing happened to my PT on a trip from Austin during the hot summer, lines iced up and the a/c stopped cooling, it was also the pressure switch.
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Old 16 Jun 2016, 10:21 pm
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Default Re: Has anyone seen this [AC]

Quote:
Originally Posted by CREWZIN View Post
When my A/C froze up two times it was because of a bad recycling switch otherwise known as the Low Pressure Switch. It's located on top of the accumulator and is easy to replace. When it goes bad, it doesn't "recycle" the compressor so it never turns off and eventually freezes things up. Turning on the heat or just letting the car run without the A/C will eventually unfreeze it and things will run normal for awhile until it freezes up again while using the A/C.
Thanks,
I'll keep that in mind.
Currently everything is working fine.
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