Way low on freon -- high side at 70F and 1500 rpm with compressor
engaged should be about 250 psi. The other choice is a bad compressor,
but you should have more pressure than that in the low side if the
compressor is bad. May have a bad low pressure cutout switch (or it's
wired around) too.
The evaporator can be cleaned by removing the blower and spraying it
with evaporator cleaner (don't use anything that can corrode aluminum).
Likely the screed over it is packed solid with crap.
You do NOT want to remove the evaporator if it is not indeed
leaking.....
On Aug 4, 2007, at 6:21 PM, Zeitgeist wrote:
> So, my AC ('87 300TD) seems to be experiencing multiple failure modes.
> One
> is the weak output of the fan. The other is the weak output of
> cooling. I
> suspect the former is due to clogged evaporator coils, which apparently
> can't be rectified short of a complete dash removal. The fan appears
> (by
> the sound of it) to be working at normal speeds.
>
> The latter issue is more mystifying. Here are the symptoms:
>
> - Low side readings = 50 psi
> - High side readings = 65 psi
> - Vent temps = 50 degrees @ ~70 degrees ambient
> - Compressor engages, yet doesn't cycle off and on as I'd suspect if
> there were a low charge level.
> - sight glass is cloudy
>
> Any thoughts? Any at all?
>
> --
> Casey
> __________________________________________
> '87 300TD intercooler/propane/biodiesel
> '94 100CSQ Avant
> '90 90Q
> '89 Bluestar
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