Fan contoll, ECM or switch?
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Joined: Jun 2001
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From: Raleigh, NC
Car: 92 1LE B4C
Engine: L98
Transmission: Auto
Fan contoll, ECM or switch?
Does the ECM controll the fans or the temp switch on the pass. side head. I know there is enable and disable temp for fan1 and fan2 in the ECM, but then what does the switch do?
Joined: Jan 2004
Posts: 2,956
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From: Las Vegas
Car: 1987 Formula (original owner)
Engine: 305 TPI
Transmission: T5
Axle/Gears: 9-bolt/3.45
The ECM uses info from the coolant temp sensor(in the front of the intake manifold) to control the primary fan; and working independently from the ECM, the fan switch(in the passenger side head between plugs 6 & 8) senses the temp to trigger the secondary fan.
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From: Chicago
Car: 1989 Camaro IROC-Z
Engine: L98 350 TPI
Transmission: Built TH-700 R4 (Vilgilante 2800)
Axle/Gears: 9 bolt w/ PBR's
Originally posted by LAFireboyd
The ECM uses info from the coolant temp sensor(in the front of the intake manifold) to control the primary fan; and working independently from the ECM, the fan switch(in the passenger side head between plugs 6 & 8) senses the temp to trigger the secondary fan.
The ECM uses info from the coolant temp sensor(in the front of the intake manifold) to control the primary fan; and working independently from the ECM, the fan switch(in the passenger side head between plugs 6 & 8) senses the temp to trigger the secondary fan.
Kevin
Thread Starter
Junior Member
Joined: Jun 2001
Posts: 36
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From: Raleigh, NC
Car: 92 1LE B4C
Engine: L98
Transmission: Auto
the secondary fan works from the temp switch and doesn't care about the A/C. I think the cpu tells the fans to come on when the A/C is on, but haven't had any replys on my post over in DIY proms yet.
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