Fans on LT1
Thread Starter
Pro
Joined: Feb 2007
Posts: 538
Likes: 0
From: Orlando FL
Fans on LT1
My 95 is a little wacky. When you start up the car, within the minute, the main fan starts kicking on and off. It does this all the time. The aux fan for the AC does not, unless you kick on the AC or the car gets up about 220 something. My question is, what might be faulty to cause a cold car to kick on it's main fan? It's not on all the time, it will usually run for a minute then turn off for about 30 seconds, then back on...
Coolant sensor? Relay?? I am a little confused with this one.
Coolant sensor? Relay?? I am a little confused with this one.
Melting Slicks
Joined: Oct 2005
Posts: 3,178
Likes: 5
From: Daleville Indiana
St. Jude Donor '08
The ECM will turn the fan on low speed when the coolant is above 108*C and off when the temp drops 3*C and the minimum on time for low speed is 50 seconds. I have not driven my '95 in a few months but I was thinking my fan starts right away and stays on when just setting in the garage.
Last edited by Jonnymac; Mar 7, 2008 at 01:56 PM.
Thread Starter
Pro
Joined: Feb 2007
Posts: 538
Likes: 0
From: Orlando FL
Oh, so that's normal then? I have never overheated, except close once on a hot day in July here, I was stuck in traffic over an hour, no air movement... But then again, it's FL and it was around 100 degrees.
Pro
Joined: May 2002
Posts: 678
Likes: 2
From: Lengede
I asked about the same question a week ago. Just got some dumb remarks but nothing that satisfied me. I then looked it up in the manual and it says, the fan or fans will kick in because of an ECM code that is set. In my case it was a #43 and #71 code.
Check your codes, this might be the answer.
Arnold
Check your codes, this might be the answer.
Arnold
Melting Slicks
Joined: Feb 1999
Posts: 3,261
Likes: 9
From: sonoma ca
I asked about the same question a week ago. Just got some dumb remarks but nothing that satisfied me. I then looked it up in the manual and it says, the fan or fans will kick in because of an ECM code that is set. In my case it was a #43 and #71 code.
Check your codes, this might be the answer.
Arnold
Check your codes, this might be the answer.
Arnold
By the way on 95 the fans run in concert, # Lo & #Hi settings under normal circumstances.
Last edited by Red Dwarf; Mar 7, 2008 at 09:10 PM. Reason: additional info
Thread Starter
Pro
Joined: Feb 2007
Posts: 538
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From: Orlando FL
Arnold, I see code 43 is Knock Sensor Circuit. What is 71? I can't seem to find that one listed anywhere.
I think this week I will have to use my Haynes and try to see if I can figure this out..
I think this week I will have to use my Haynes and try to see if I can figure this out..
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1st Gear
Joined: Mar 2008
Posts: 1
Likes: 0
I just saw this on my bosses 93 Vette. I pulled up a Code 15, which is coolant sensor. From what I've been reading there are 2 coolant sensors. One is on the water pump and that's the one that is bad if it's throwing a code. The other sensor is on the driver side head and that is ONLY for the temp sensor on the dash. Now if the water pump coolant temp sensor is bad and throwing a code, I can see the fans turning on.