Main fan on when running
Thread Starter
Pro
Joined: Feb 2010
Posts: 677
Likes: 3
From: Metairie LA
Main fan on when running
Just got it all back together and running well - started tuning all over again on my own and my issue is as soon as the engine runs the main fan comes on and stays on. Key on engine off the fan is off.
Been all through the 6E on tunerpro and the temps for on and off are correct (same as before the partial rebuild).
I did remove the firewall box for the AC and have tried all combo actions of jumping the pressure switches to no avail.
Checked the Datamasters logs and in viewing the data bits the second "fan request" is always checked as "on" from the beginning. All other readings in the data logs are correct (temp, etc.).
Sure it is something easy I am missing but I'm a bit dumbfounded.
Any suggestions?
Been all through the 6E on tunerpro and the temps for on and off are correct (same as before the partial rebuild).
I did remove the firewall box for the AC and have tried all combo actions of jumping the pressure switches to no avail.
Checked the Datamasters logs and in viewing the data bits the second "fan request" is always checked as "on" from the beginning. All other readings in the data logs are correct (temp, etc.).
Sure it is something easy I am missing but I'm a bit dumbfounded.
Any suggestions?
Thread Starter
Pro
Joined: Feb 2010
Posts: 677
Likes: 3
From: Metairie LA
The startup temp according to Datamasters is in the 80's and it goes to the low 170's which is normal for my setup. The fan only runs when the engine is running - that is what is puzzling me. It kind of rules out relay (may just replace it anyway).
I am still wondering if it has anything to do with removing the AC box from the firewall and the pressure switches. I tried different combinations of jumping the switches again this afternoon - no joy.
I am still wondering if it has anything to do with removing the AC box from the firewall and the pressure switches. I tried different combinations of jumping the switches again this afternoon - no joy.
Intermediate
Joined: Apr 2011
Posts: 34
Likes: 1
I just started having fan on too? any luck
I have a 90 and have been tuning and that just happened to me too, I know there is an AC control witch for the fan (s) but havent messed with it yet. If I figgure it out i'll let you know
Last edited by carl8080; Apr 11, 2012 at 12:31 PM.
Thread Starter
Pro
Joined: Feb 2010
Posts: 677
Likes: 3
From: Metairie LA
What led me back to the AC box and hard line removal was when I displayed the data bits in Datamasters it always said AC requested (don't remember which bit it was off the top of my head). Checked old data logs and that bit was not requested, so I put the pressure switches back on and fan operation was back to normal. I'm not sure which one of the switches was responsible, I just put them all back on their respective wires.
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Intermediate
Joined: Apr 2011
Posts: 34
Likes: 1
Intermediate
Joined: Apr 2011
Posts: 34
Likes: 1
