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Posted 03 January 2008 - 11:30 PM
Posted 04 January 2008 - 01:17 AM
or the previous owner hard wired it.
should be an easy fix, good luck!
Posted 04 January 2008 - 04:34 AM
If the compressor is spinning - do you actually get cold air? Im willing to bet its a malfunction with the A/C compressor sensors or control rather than a fan relay issue.
On the 1990 Legacy im working on: the first fan will spool up immediately and the second one kicks in a second or 2 later. Both will run constantly if the compressor doesnt spin (engine off or drive belt missing).
Posted 04 January 2008 - 02:38 PM
I'm going to quote from the FSM in order to avoid confussion and argument.
From the Air conditioning system section.
MECHANISM AND FUNCTION
1) When MODE switch is set to "MAX A/C", "A/C", "DEF/HEAT" or "DEF", air conditioning sytem relay activates to enter a signal into engine control unit. This turns on both compressor clutch and F.I.C.D. (Fast Idle Control Device). At this point, the main and sub fans also operate. Blower relay operates to direct the air flowrate determined by FAN switch position.
2) Thermostat activates to stop compressor clutch, F.I.C.D., and main and sub fans.
3)When "High-Low" pressure switch operates, compressor clutch and F.I.C.D. stop but main and sub fans are operating.
4) When fan control switch operates, both main and sub fans operate rapidly.
Posted 04 January 2008 - 03:04 PM
The problem is with car #1.
I agree with all that from the FSM, but from what i read the problem was that the fans ARENT cycling on and off on car #2. As i dont have an FSM, does it say anything about that issue?
Posted 04 January 2008 - 03:48 PM
When in any defrost mode, the A/C is used to dry the air to prevent windsheild fogging. The A/C compressor runs, the fans run. If not there is a problem.
When in any A/C mode, the A/C is used to remove heat from the air inside the car. The A/C compressor runs, the fans run. If not there is a problem.
Posted 04 January 2008 - 06:17 PM
Posted 04 January 2008 - 06:33 PM
Step away from the tool chest.
Thanks guys, I'll back the worry truck up and just go with the flow, err blow
Posted 04 January 2008 - 07:13 PM
oops my bad, keltik allready mentioned the key on fans on..........so whats the problem item.
Posted 04 January 2008 - 07:23 PM
O K new question, do/are the fans come on without the engine/ac compressor running, as in just the key on, 1st car no 2nd car yes.....boy is this fun, good thing its raining cats and dogs
Yes they should come on KOEO, with controls set to A/C or defrost mode.
In the post were I quoted from the FSM, read #1.
When you set the controls to an A/C or defrost mode, the ECU turns the fans on.
Car #1 is not right.
Car #2 is doing what it was ment to do.
Posted 05 January 2008 - 05:07 PM
Posted 05 January 2008 - 05:36 PM
So we will have to assume that there are no problems with the control panel, or the A/C relay.
If both fans cycle on and off as needed for engine cooling, then we have to assume the main fan and sub fan relays and fuses are good.
To tell you the truth this is a fairly complicated system. I would have to spend quite a bit of time studying a wiring diagram.
According to the FSM, when the A/C relay is activated it is then a function of the ECU to turn the fans on. I don't have a wiring diagram handy today, so I'm not sure were to start testing.
Posted 06 January 2008 - 07:11 AM
is there a reason this is a problem? the fans come on, that's it? sounds relatively benign.
Posted 06 January 2008 - 02:50 PM
They are not running when the A/C compressor is running. In the winter, no this is probably never going to be a "problem". Summer, it may very well be a "problem".
As far as I know I haven't checked but I sure can................The A/C compressor runs continuously when in Defrost mode, and the fans will as well.
In A/C mode the compressor runs as needed to maintain an output temp at the evaporator of ~32-38 deg. F. The fans will cycle on and off with the compressor.
If this is not happening then the system is not working as designed. Weather it is a "problem" is personal opinion and/or weather the car is going to over heat in the summer with the A/C going.
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