Fan Temp Switch trouble
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
One fan or two?
No sure about '85 but later models the ECM controls the main fan and the aux fan in front of the radiator is controlled by a switch in the head
between #1 + 3 spark plugs.
Read http://forums.corvetteforum.com/show....php?t=1518638
for more info.
No sure about '85 but later models the ECM controls the main fan and the aux fan in front of the radiator is controlled by a switch in the head
between #1 + 3 spark plugs.
Read http://forums.corvetteforum.com/show....php?t=1518638
for more info.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
The main fan is controled by the ECM. For the aux fan, I think 85 is a little different that the later L98. It may be on the passenger side where as the 86-89 I know is between #1 and #3 spark plugs.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
The ECM controls the main fan. There is a temperature activated fan switch in between the number 6 and 8 spark plugs in the right side head. If you have an auxiliary fan, that switch is what activates it. For 1985, only, if you don't have an aux fan, that switch backs up the ECM control of the main (only) fan. Years after 1985, with no aux fan, don't have a fan switch.
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Thread Starter
Racer
Joined: Sep 2003
Posts: 454
Likes: 1
From: Lompoc CA
Originally Posted by CFI-EFI
The ECM controls the main fan. There is a temperature activated fan switch in between the number 6 and 8 spark plugs in the right side head. If you have an auxiliary fan, that switch is what activates it. For 1985, only, if you don't have an aux fan, that switch backs up the ECM control of the main (only) fan. Years after 1985, with no aux fan, don't have a fan switch.
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Richard
Le Mans Master
Joined: Jun 2001
Posts: 6,694
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From: Less Talk, More WOT | Houston TX
Originally Posted by nonetooclose
I do have an aux fan that has never worked. I am a little confused from your description... so does the 85 have a fan temp switch for the main fan? Or is it entirely controlled from the ECM and based on the coolant sensor?
Richard
Richard
Le Mans Master
Joined: Jun 2006
Posts: 5,642
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From: One day you're a Comet...the next day you're dust... Arkansas
Originally Posted by nonetooclose
I do have an aux fan that has never worked. I am a little confused from your description... so does the 85 have a fan temp switch for the main fan? Or is it entirely controlled from the ECM and based on the coolant sensor?
Richard
Richard
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by nonetooclose
I do have an aux fan that has never worked.
Originally Posted by nonetooclose
I am a little confused from your description... so does the 85 have a fan temp switch for the main fan? Or is it entirely controlled from the ECM and based on the coolant sensor?
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Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
The red wire and the switch (blue box) were drawn in. They aren't a part of the original schematic. I believe the wire and the switch are for Central Coaster's manual switch.
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Pro
Joined: Mar 2006
Posts: 554
Likes: 1
From: U. S.A
Originally Posted by nonetooclose
I do have an aux fan that has never worked. I am a little confused from your description... so does the 85 have a fan temp switch for the main fan? Or is it entirely controlled from the ECM and based on the coolant sensor?
Richard
Richard
Thread Starter
Racer
Joined: Sep 2003
Posts: 454
Likes: 1
From: Lompoc CA
Originally Posted by CFI-EFI
OK. I answered the original question of where the fan switch is located.
I don't understand what part of what I wrote, that YOU don't understand. I thought it was pretty clear. However, you will have to forgive me, English is my first language.
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I don't understand what part of what I wrote, that YOU don't understand. I thought it was pretty clear. However, you will have to forgive me, English is my first language.
RACE ON!!!
In essence I am confused as to where the problem lies... in my ECM or in the switch. The reason there is confusion is because the ECM has malfunctioned in the past (one of the injector power transistors is weak) and I am wondering if it is the cause of the problem, but I want to try the switch first.
Richard
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by nonetooclose
No need to get touchy! Just trying to be clear since it does not make 100% sense yet to me.
In essence I am confused as to where the problem lies... in my ECM or in the switch.
Richard
In essence I am confused as to where the problem lies... in my ECM or in the switch.
Richard
Originally Posted by nonetooclose
Help! I cannot seem to locate my fan temp switch on my 1985. Does anyone have a pretty exact location for this switch?
Originally Posted by CFI-EFI
in between the number 6 and 8 spark plugs in the right side head.
Originally Posted by CFI-EFI
The ECM controls the main fan. There is a temperature activated fan switch in between the number 6 and 8 spark plugs in the right side head. If you have an auxiliary fan, that switch is what activates it. For 1985, only, if you don't have an aux fan, that switch backs up the ECM control of the main (only) fan. Years after 1985, with no aux fan, don't have a fan switch.
Originally Posted by nonetooclose
so does the 85 have a fan temp switch for the main fan? Or is it entirely controlled from the ECM and based on the coolant sensor?
Also, I don't get, what you're asking when you say, "In essence I am confused as to where the problem lies...". Me too! you haven't told is what the problem IS.
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