My C4 has the option for a single coolant fan
and one small a/c condenser fan.
If the a/c is off, the coolant (big) fan turns
on at start then turns off if it's cool or at
speed (IIRC about 35-45 mph). The ECM and fan
relay control this.
Note: There's an option for dual coolant fans
plus the a/c fan. That option might work
my 88 has one big fan behind the radiator and a small fan in front.. the
small fan comes on at 230 deg and runs untill the temp drops to about 200
deg.. the big fan behind the radiator only runs when the AC or defrost is
on.. when i had a problem with my AC it was because the pressure switch in
the AC line was bad and the big fan would not come on.. your switch may be
stuck cosed making the fan run...
88 35th anniversary #1580
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