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Alex,
I have found in playing with my 4 (all with working AC) that charge is critical in 240s, also I noticed a huge difference in the calibration of the thermostat in them. Turning it all the way to the red seems to bypass the thermostat function "for quick cooling of the interior" as the glove box manual says. This gave cold air on all 4, (39-42) at 1500 rpm, moving the dial to the red/blue edge and holding rpms at 1500 would give between 41 (244Ti) and 47 ('88)
Just a guess but I don't think that is a high tech piece of equipment, more like a late 70s version of climate control. I know at first I was hesitant to turn it all the way into the red, red does mean danger after all, then I found out the '91+ just had a switch and gave it a shot, wow cold air.
The manual says not to leave it there as there is a chance of icing the evaporator, this is true in building AC systems when not enough air is flowing across the evap' so it makes sense if you had the fan on low it might in the car also. I did end up putting a switch from a later car in the 245 and it was not adjustable for me, too cold at times (when is the last time you heard that about a 240) so I put the dial back in series with the switch.
Cheers
Dave Shannon
Spring Valley, California (San Diego area)
'84-245 200K+
'84-245T 190K+ (parts is parts)
'85-244Ti 200K+ (getting a complete sound proofing)
'88-240 180K+
'01 Jeep Wrangler Sahara 10K
www.volvo2.homestead.com (Opens new window)
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