[MR2] Mk1 A/C problem

[Bob S]

You didn't say propane... did you?

Low side high usually relates to a bad expansion valve but easily could be a
plug in the system.  

I have heard of hoses breaking down and the rubber plugging stuff up.  Let's
hope it isn't that... the only real way to correct something like that is to
flush and hope or the replacements of darn near everything.

Now that I got my ranting out of the way I searched a database and came up
with two suggestions.  The easiest one (not even going to ask if you still
have propane in it) is the expansion valve. I hit better than 20 posts and
all of them said you have to use an oem unit.  Aftermarket expansion valves
were blamed for better than 40% of the postings I read

I personally have an aftermarket expansion valve on my car and since I am
waiting for the right style new compressor to come in I am seriously
considering replacing it with an OEM unit before I recharge the system.

The aftermarket compressors have had a short life on my car and it is easy
to blame it on the expansion valve sticking and sending the pressures
through the roof... or they just could be ^%$#$% reman compressors that I am
lucky (or unlucky) to have an almost lifetime warranty on them.

The other option is the failing low side hose.  There was one post on a Land
Cruiser that had a hose fail.  The only down side with this... beyond the
stuff circulating through the system was that he had to cut open the hose to
prove where the stuff was coming from.  A lot of the stuff got through the
system and ended up at the expansion valve.

HTH

Bob





-----Original Message-----
From: mr2-bounces at mr2.com [mailto:mr2-bounces at mr2.com] On Behalf Of David
Thomas
Sent: Tuesday, August 28, 2007 8:30 PM
To: mr2 at mr2.com
Subject: [MR2] Mk1 A/C problem

Gang,

I hope somebody can shed some light on a problem I have with the A/C on my
'86 Mk 1.  The end result is little cooling.  The symptoms arre high
pressure on the low side and normal pressure on the high side.  The
repairman was sure it was the expansion valve, replaced that (along with the
receiver-dryer) to no effect.  One suggestion was excess oil in the system,
so he took everything apart and drained it, including the compressor, and
made sure the oil was the proper type and quantity.  He has also converted
the system to R-134.  The compressor is a Denso rebuilt from Sparkplugs,
Inc. which I put in this spring.  After I had replaced the compressor and
charged the system, using propane, it worked fine for about two months then
the cooling dropped way off.  I tried adding more gas, but it didn't really
help, so I took it to a local garage which is run by a former Toyota
mechanic.  He has had the car for three weeks now and is ready to
surrender.  He says the only thing is can be now is the compressor, which he
suspects may have a bad reed valve somewhere internally.  Any constructive
suggestions will be appreciated.

Thanks, Dave Thomas
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