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Old 04-12-2004, 01:55 PM
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Join Date: Aug 2003
Location: Phoenix
Posts: 3,726
AC Electrical Problem

My AC won't work because the compressor won't come on because, apparently, my compressor relay is not getting a TD (rpm) signal. I'm told this is sort of a safetly feature - the compressor relay compares the engine rpm to the compressor rpm and unless they are the same the compressor won't come on. So my compressor won't come on because it's not getting the engine rpm signal. I realize this is an obscure question but does anyone know where that engine rpm signal comes from, and what might be causing the failure. The wiring harness was recently replaced but I know the AC worked for a while after that.

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Old 04-12-2004, 02:05 PM
G-Benz's Avatar
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
Year and model please......and engine if known...
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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Old 04-12-2004, 02:20 PM
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Yes, we find such information to be quite helpful.

Have a great day,
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Old 04-12-2004, 03:22 PM
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Join Date: Aug 2003
Location: Phoenix
Posts: 3,726
Boy you guys are fast - I had already realized I forgot the model info, logged back on to edit it and found two posts already. The car is a 1994 E320 coupe, 104 motor, the tach is working fine. Thanks.

Last edited by deanyel; 04-13-2004 at 12:15 AM.
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Old 04-13-2004, 04:43 AM
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Join Date: May 2001
Location: Northern Va.
Posts: 3,386
I hope you get it fixed soon, Phoenix is about to become an oven. The car is white, isn't it?


Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL


Not part of the in-crowd since 1952.
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Old 04-13-2004, 11:54 PM
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Join Date: Aug 2003
Location: Phoenix
Posts: 3,726
No, no - the car is black. But when Phoenix turns to an oven, which is a little more than half the year - I leave. But I thought I had it sold to a year-round resident - but the deal fell through - so it's become a low priority project.

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