System may be overfilled or expansion valve is bad. The high speed is
due to excessive high side pressure. The R134 does operate at slightly
higher pressures than R12. The replacement expansion valves are set for
the R134A.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of Roger Van Till
Sent: Thursday, July 01, 2004 3:42 PM
To: vanagon@GERRY.VANAGON.COM
Subject: AC conversion quirks

My trusted mechanic switched my 89 Westy automatic over to r134 last
week.
Since then when I turn the AC on the fan starts up on low speed and two
seconds later whips up to high speed,
then continues to cycle the high speed fan on and off several times a
minute.
It never acted like this before when the system had freon in it.
Is this a problem or is it the nature of the new refrigerant?
This occurs whether the engine is hot or cold. I had a new water pump
installed at the same time, but this is function ing fine my temps are
normal
and the fan comes on low when the needle climbs in traffic.
Any Ideas?

Roger Van Till
'89 Westy
"The Moose Lounge"