How does aux fan activate?
Pro
Joined: May 2006
Posts: 637
Likes: 0
Either by letting the temp get up to 230, or, if I´m not mistaking by grounding A and B on the ALDL.
Check the aux-fan relay (should be under the hood somewhere), someone with a 88-89 will chime in I guess to tell you where to find it or it´s in the FSM if you have it...
Check the aux-fan relay (should be under the hood somewhere), someone with a 88-89 will chime in I guess to tell you where to find it or it´s in the FSM if you have it...
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
'89 aux fan is by mech switch only.Pull the wire off the switch (drv side head between #1 & 3 ) and ground it.Fan should run. Lower temp switches are available; stock is 235+
Last edited by rodj; Aug 16, 2009 at 08:59 AM. Reason: screwed up
Pro
Joined: May 2006
Posts: 637
Likes: 0
Maybe it´s the same on my 91 then, been awhile...
Drifting
Joined: Feb 2008
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From: NE Ohio
2024 C4 of the Year Finalist - Unmodified
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
as I previously stated above but only pre '90 cars which have the aux fan in front of radiator.
90+ cars have both fans on engine side of radiator and both are controlled by ECM.There is NO switch in the drv side head
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Le Mans Master
Joined: Dec 2000
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From: San Diego, Ca
Not all Vette's have this option and they cool fine - in fact if it's coming on at all, that usually means something else is wrong and it has nothing to do with a/c - it isn't even linked to it (and if a plugged up a/c system gets the coolant hot enough that it needs to come on it's probably going to blow a hole in the hood before you get a chance to see if it's running). Keep the a/c off and block airflow - I stick mine up against the garage wall when it's 90 or better. That will usually get it to the threshold to come on and while looking at a scanner you'll see what the Coolant Temp Signal is when it starts cranking.
Thread Starter
Melting Slicks
Joined: Jun 2002
Posts: 2,152
Likes: 241
From: Northern VA
Thanks SunCr!
Not all Vette's have this option and they cool fine - in fact if it's coming on at all, that usually means something else is wrong and it has nothing to do with a/c - it isn't even linked to it (and if a plugged up a/c system gets the coolant hot enough that it needs to come on it's probably going to blow a hole in the hood before you get a chance to see if it's running). Keep the a/c off and block airflow - I stick mine up against the garage wall when it's 90 or better. That will usually get it to the threshold to come on and while looking at a scanner you'll see what the Coolant Temp Signal is when it starts cranking.
Melting Slicks
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From: Palm Beach
Race Director
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