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Old 08-15-2003, 04:49 PM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Bad A/C relay again, in less than 6 months!

I have the same symptoms and did the same testing as I did on this thread:
300e compressor not engaging

About a week ago, it was raining really hard, I drove over some water on the road. The A/C quit working. I re-started the car and the A/C worked againg.

A couple of days ago, I started the car in the morning after a heavy rain overnight. The A/C has not been working eversince.

I have two theories:
1. Water is coming in behind the battery, where the relays are, and shorting the relay. It is raining a lot in Florida.
2. The belt tensioner is weak and the speed sensor is killing the relay somehow. Is that possible?

One thing I did not notice before, or can not remember, is when I jumped the relay with 5 and 7, the compressor did engaged but, the jumping wire was real hot.
BTW, I do have the bottom engine shield.

I do not want to buy a realy every six months. Any ideas?
'86 300E
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