Date: 29 Aug 1997 18:28:04 -0400
From: kenbellnopsamx.com (Ken Bell)
Subject: '88 9000T: AC dead, auxiliary fan relay melts socket


Several weeks ago, the air conditioner in our '88 9000T suddenly stopped cooling. So far as I could tell, the clutch no longer engaged. My first guess was that the system was low on freon. There are no telltale oil stains on any of the hose fittings or around the compressor, however, and I have no AC gauge set for a direct test. Today I found that a bit of the plastic socket around pin #30 of the "AC/ACC fan relay" had partially melted onto pin #30 of the relay. This relay controls both the compressor and the "auxiliary radiator fan for the AC"; it bears the following identifying marks: "89 8399 / SAAB-SCANIA / 95 13 219 / 12V 6/20A / 2 88". Based on the diagram on page 238 of Saab's "3:2 Electrical system, Comprehensive wiring diagrams", it appears to me that the current to run the auxiliary fan (component #172 for those who are following along in their shop manual :-)), is supplied through pin #30 of this relay (component #156), leading me to suspect that the fan is drawing excessive current. Or could it be the clutch? How do I troubleshoot this problem, without throwing parts at it? o What should be the operating current through the fan? o How can I test the relay to determine if it must be replaced? o Is it possible that the real problem lies elsewhere? Thanks in advance for any clues and comiseration :-) -- Ken Bell :: kenbellnopsamx.com :: (212) 475-4976 (voice) ======== :: syklbnopsam.nasa.gov :: (212) 678-5516 (voice), 678-5552 (fax)

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