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#1
03-16-2005, 09:44 AM
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How's it work--A/C condensor fan
I have a 95 Century which has 2 fans on the radiator. The one behind and to the drivers side is the radiator fan and cycles with the water temp. The pusher fan in front the radiator and to the passenger side must be the condenor fan. On all my previous vehicles (Honda, Plymouth) this condensor fan ran whenever the compressor was running. Problem is I've never seen the fan run on the Buick. Is this fan supposed to run whenever the compressor is running??? I just bought the car this winter and had to get the freon charged to get the compressor to run.
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#2
03-17-2005, 09:30 PM
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I had a diffrent problem with a/c on My fathers lumina and was sent here ---> http://www.autoacforum.com/ and I found my answer in another post there. Hope this helps.
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Now remember, I like most people on this site are not master mechanics. These are places I would start on my own car. My advice cost you nothing but, maybe some time. If it's right or wrong please report back so someone else (maybe even me) will know where to look if I/they have the same problem. Good luck
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#3
03-17-2005, 10:23 PM
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Thanks, I'll check the autoACforum that might be just what I'm looking for.
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#4
03-26-2005, 07:45 PM
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Typically the condensor fan runs thus: When the A/C is energized, the high pressure switch closes, telling the ECM that the A/C is energized. This signal will tell the ECM to energize the relay controlling the condensor fan. The voltage going to the fan will be direct, in most applications, through a fusible link. The ground will be switched by the relay, using the signal from the ECM. If the A/C operates correctly, the problem is likely to be the fan motor, but this can be checked before replacement. If the motor is defective, I suggest replacing the relay as well. You might try turning ther A/C on and carefully rotating the blade for the motor. If it spins up, the motor is likely tired, which will damage the relay. Let me know... Ray
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#5
03-26-2005, 08:48 PM
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Ray,
I no longer think that is how it works in my car. I suspect it works like this: The computer monitors engine coolant temp as we all know and will engage the main (puller) fan if needed to cool the radiator. But also apparently the computer monitors the status of the A/C and operates the same fan if it needs air flow across the condensor. The computer apparently will only operate the pusher fan when the main fan is not enough. This is quite unlike other cars I've known but I'm pretty sure that is what is happening. This is how I arrived at this opinion: 1. I know the fan motor works when jumpered to the battery. 2. The relays (although I don't know which one is for what) were swapped around with others of identical type and nothing else stopped working and the pusher fan never started working so I'm assuming they are all ok. 3. Although too dificult for me to verify there is no reason for the wiring to be bad--I can't think of any place in those circuits that it would be subject to breaking (for instance a power window circuit would be subject to breakage where it goes from body to door with the constant flexing). 4. The A/C cools good. 5. The main fan will cycle when the A/C is on even if the engine temp is not hot enough to need it. 6. Unlike other vehicles I've know the compressor doens't seem to cycle but instead remains on all the time (hummm). So, for now I'm just observing it and waiting for very hot weather to see if the pusher ever runs and to see if it continues to cool well. Also you might want to look at the question I asked on the Auto A/C Info. Forum: http://www.autoacforum.com/messagevi...threadid=12434 Anyway, Thank you for your post. I do appreciate any and all advise.
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