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Hi there,
Just today I re-wired a 91's fan relay to come on with the compressor clutch, because the high pressure switch would become flaky after running some time.
1991 is the first year for 240s to sport the new system with orifice tube and helper fan on the condenser. The relay is rather simple, operating only the fan, turned on by the high pressure switch whenever AC is on (and alternator delay is complete). I just pulled those two pins and pushed them and their gray wires back in the harness sleeve, and tapped into the clutch wire (green) where it comes closest. Saving some of those terminals from another old harness plug helped, so I didn't need to cut the gray wires.
No way am I going to lose the R12 or get a shop to do that just to replace that high pressure switch.
Anyway, check at the relay. If all is working properly you should have +12 batt switched by the two large red wires, and +12 on one of the gray wires always (if the compressor is running) and the other gray wire switched to ground by the high pressure switch.
--
Art Benstein near Baltimore
"When I read about the evils of drinking, I gave up reading." - Henny Youngman
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