Re: High idle and fan.

["Jonas Karlsson" <jonas85k@hotmail.com>]

>From: Captnbr@aol.com
>
>Has anyone been able to figure out what causes the high Idle when the >A/C 
>is turned on besides the idle switch on the throttle body.

>snip<

>  Seems like when the fan is on it is ice cold and when the fan is off it 
>is not cold.  And its seems that when the radiator fan is on the idle is 
>fine but when the idle is high the fan will not be on and the A/c will not 
>be that cold.

Lemme see if I can tackle this one. It seems to me that your A/C is "coming 
and going" I'd have to look at some wiring diagrams to be sure, but cars 
with A/C should have a way to automatically increase air bypassing the 
T-body when the A/C is switched on. To compensate the load the compressor 
puts on the motor.

Furthermore, the radiator fan is supposed to automatically go on "High" 
whenever the A/C is on, so if it is off, then there is a break in the 
circuit somewhere.

Basically, It seems like your A/C is sometimes not on (not blowing cold, and 
radiator fan not on) but your switch is in the "on" position, so the 
computer thinks it is on, and boosts the idle to (over)compensate. Cycling 
it gets the A/C to actually turn on, and the idle is fine.

get that?

Does cycling the switch always work? That sounds like it could be a relay of 
some kind. Or a bad connection at the switch. Check your wiring diagrams and 
see where everything connects.

HTH

Jonas
85 Scirocco 2.0
78 Scirocco 1.8
For direct reply: jonas@metabolex.com
http://www.geocities.com/scirocco2l8v
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