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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Tue, 7 Aug 2001 13:29:53 Share Post by Email
In Reply to: Help! Cooling fan and a/c compressor... Is there a connection, Vita D, Tue, 7 Aug 2001 09:01:53
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A couple of points-
There are two fans on the radiator - one on the engine side (radiator fan), and one on the grill side (A/C fan). I'm assuming you mean the radiator fan, as it's the big one that's the easiest to see. You say that if you short across the switch (I assume you mean the fan thermoswitch in the radiator), the fan comes on.

Here's what I get from this-
Since jumpering across the radiator fan switch turns the fans on, but they don't come on otherwise, three things - either the switch is bad, or the radiator is clogged in that area and the temperature never gets warm enough to trip the switch, or you aren't waiting long enough for it to come on.

Here's the key with how the fanS work with AC-
The AC fan (small one on grill side of radiator) will come on whenever the AC clutch is pulled in, and goes off whenever the AC clutch is released.

The radiator fan has two speeds (in your year). Assuming a stock thermoswitch, the low speed comes on when the switch reaches 90C, and high speed at 110C. It will ALSO come on At Low Speed if the AC PRESSURE exceeds a certain amount (don't remember off the top of my head). The theory is that AC pressure increases with load on the AC (just what I read), so under higher AC load conditions - hot weather, the radiator fan kicks in.

My guess is you've got something still wrong with the radiator thermoswitch - either a bum switch (even new, out of the box switches can be bad) or something in the radiator itself.

It sounds like your AC system was low on refrigerant - perhaps the mechanic didn't put 1lb into an empty system (half charge, as Robert says), but ADDED 1 lb to an already low system. With enough refrigerant, the low pressure cutoff goes away, and your system blows cold.

The radiator fan will come on with sufficient AC system pressure. If your AC system was too low on refrigerant to enable the compressor, it would be well below what's necessary to trip the radiator fan. Once refrigerant was added, and you drove home in what was probably the heat of the afternoon, the higher AC pressure was enough to trip the switch and turn the radiator fan on. In the (relative) cool of the morning, the AC pressure didn't get high enough to trip the pressure switch, and the radiator fan stayed off.



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