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R134 kit for a '91. Any work under the dash? 200

posted by  chris herbst on  Sat Apr 5 18:52 CST 2003
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last visit: Mon Oct 20 20:32 CST 2014
[RELATED]

No under dash seals should be necessary.

All conversions have to be done carefully. That compressor (Diesel Kiki, probably) lasts pretty well with R134a.

Make sure the orifice tube is changed. Extremely important (and frequent shortcut to leave it out).

Also, one trick for conversion on 91-92 240 series cars, is to jump the electric fan switch at the high side pipe halfway back on the right side frame rail at the bottom of the engine compartment, accessed from the right side of the car under the hood. This is a little "J" shaped pipe with a wiring harness attached to the pressure switch on it. All that has to be done is the wiring harness (two wires) removed and a wire passed between both terminals. Then tape the whole thing up and leave it alone. that will cause the fan to function WHENEVER the air conditioning switch on the dash is on. It makes a very positive impact on the system with R134a. otherwise the fan only runs with pressure of a certain rate.

Also lowering the cycling pressure to the 20 pounds range helps a little bit.
--
chris herbst, near chicago






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