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Old 09-28-2006, 03:42 PM   #1
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d4rkf1ber is on a distinguished road
Join Date: Sep 2006
Posts: 21
Question A/C Problems - '99 SL2

Need help troubleshooting A/C problems on a '99 SL2. I am NOT planning on doing the work myself, however I like to try to get a good handle on things before I ask others to do it for me, mainly for personal growth/knowledge and to not be suckered into unneeded things like many pro's try to do to you.

Ok, so the problem is that A/C is not getting or staying cool while car is not moving. Just started yesterday. While car is moving A/C feels fine.

Today I popped the hood and looked and listend. I noticed that the belt to the A/C compressor is tight and turning fine. I hear a noise though sounds like the fan over the radiator is making a noice, kinda sounds like plastic touching plastic when it is spinning, not bad just noticeable but obviously not right. Anyway, that was about it. So I just watched and listened for a while as the car ran in park under the carport.

Then I start noticing the compressor turning off which seems to coincide with the fan over the radiator turning off. The belt portion of the compressor always spins of course since its tied to the serpentine belt. I am unfamiliar with cars and how things work so forgive me here. As I am watching I noticed that there is a part of the compressor that spins but can also stop spinning, did not realize this until I saw it slow down and stop. Just thought it spun originally because its right there where the serpentine belt is.

Anyway, when this thing slows down and stops, the fan over the radiator does as well. Not sure how or why they are tied together but they are.

It happend rather frequently as I watched it. I know if a compressor is bad or going bad it will obviously affect the A/C cooling. But since a compressor is a tad expensive, I want to make sure nothing else could be affecting it or its performance. Also curious what controls when it is engaged or not? Since it works fine while driving there is a part of me that thinks the compressor might be ok, otherwise the A/C would not cool no matter what.

Who knows, seeking any advice or input before I head over to a pro.



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