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Old 06-14-2005, 01:11   #1 (permalink)
Treetop
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Re: Re: 92 F250 AC problem

SnoMan wrote:
:: "Treetop" wrote:
::: SnoMan wrote:
:::: "Treetop" wrote:
:::  >> I reciently had a shop convert my AC over to the new
::: R134. It worked
:::  >> for
:::  >> about an hour then stopped. 2 days later it worked
::: fine for two days
:::  >> and
:::  >> now it stopped working. Is there some sort of a
::: relay or something
:::  >> that
:::  >> would cause this to work, then not work.....?
::::
:::: When you say it stopped do you mean stopped cooling, the
::: compressor
:::: stopped running or what stopped. R134a will hits higher
::: pressure on a
:::: warm day than R12 will and can cause a over pressure kick
::: out on some
:::: systems. Most conversions go fairly smoothly but some do
::: not as R134a
:::: does have a diferent pressure curve than R12 and is a
::: marginal
:::: replacement at best in a system desigened for R12. If
::: compressor does
:::: not run, check charge pressures to see if they are too high
::: (or too
:::: low) In a conversion you want to error to a slight
::: undercharge with
:::: R134a in a R12 system, not a overcharge.
:::
::: When it stopped, the vents stopped putting out very cold air.
::: The AC air
::: was the same temp as the vent air, using a very scientific
::: process involving
::: putting my hand in front of the vent to check.
:::
::: The compressor was kicking in a out like it should, however it
::: seemed to me
::: that it was kicking in an out a bit more frequently.
:::
::: It seems to work when it is warmer outside than when it is
::: cooler out, over
::: 80 degrees F.
::
:: Try changing/upgradin the cutout switches. There is shrader valve
:: under them to prevent freon loss. Does sound like it might be just a
:: bit under charged though. If it was overcharged it would kickout
:: prematurely in hot weather.
::

I finally got a chance to take it back to the Mechanic. He checked for
leaks and drained and recharged the system. He took it out for a few test
drives and worked for him just fine. I picked it up. It worked for about 5
miles. While driving home and thinking of finding a new mechanic, I turned
the temp to hot for a bit then back again and it worked the rest of the way
home. Is there such a thing as a faulty temp switch? Is it something that
I can replace?


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