Fans continually running
#1
I've found that life I needed.. It's HERE!!
Thread Starter
Fans continually running
My son's recently put his Mk1 Focus RS back on the road after a 3 year long rebuild.
The Ford ECU is still in place, mainly just to run the dashboard cluster, but all of the engine management is now controlled by an Omex 710
It's running a base map at the moment just so we can get some miles on it before it goes off for final mapping, but we have a small problem with the rad fans.
Both fans start running as soon as the engine starts and don't go off. The water temp warning light is on on the dashboard, I presume because the temp sensor is no longer connected to the Ford ecu (so we need to to sort that), but what's telling the fans to come on? The fans are set in the Omex to come on at 95 and off at 85, so something somewhere else must be telling them to come on.
Could the Ford ECU still be telling the fans to run if it thinks the engine's overheating? Is there another wiring route to the fan motors somewhere?
There's some electronic thing at the top right of the radiator that seems to feed into the rad fan wiring. What's that?
Oh, and the aircon has been removed in case that may have some bearing? we've tried all the usual tricks of setting the aircon switches to certain places etc to no avail
Any thoughts anyone?
The Ford ECU is still in place, mainly just to run the dashboard cluster, but all of the engine management is now controlled by an Omex 710
It's running a base map at the moment just so we can get some miles on it before it goes off for final mapping, but we have a small problem with the rad fans.
Both fans start running as soon as the engine starts and don't go off. The water temp warning light is on on the dashboard, I presume because the temp sensor is no longer connected to the Ford ecu (so we need to to sort that), but what's telling the fans to come on? The fans are set in the Omex to come on at 95 and off at 85, so something somewhere else must be telling them to come on.
Could the Ford ECU still be telling the fans to run if it thinks the engine's overheating? Is there another wiring route to the fan motors somewhere?
There's some electronic thing at the top right of the radiator that seems to feed into the rad fan wiring. What's that?
Oh, and the aircon has been removed in case that may have some bearing? we've tried all the usual tricks of setting the aircon switches to certain places etc to no avail
Any thoughts anyone?
#4
I've found that life I needed.. It's HERE!!
Thread Starter
Pull the fan relay and they stop.
Was thinking about putting a switch in, but might have to start pulling things apart again and having a look at how things are wired up
Was thinking about putting a switch in, but might have to start pulling things apart again and having a look at how things are wired up
#5
PassionFord Post Whore!!
If the Ford ecu isn't seeing correct values it may be putting the fans on as it think a there is a problem.
A lot of cars if you unplug the coolant temp sensor the fans will come on.
A lot of cars if you unplug the coolant temp sensor the fans will come on.
#6
I've found that life I needed.. It's HERE!!
Thread Starter
That's exactly my thinking, just a bit stumped as to how it's still controlling the fans though as the fans are now controlled by the Omex
#10
I've found that life I needed.. It's HERE!!
Thread Starter
Sorted.
The Ford ECU was controlling the high speed fan relay, and overriding the Omex.
Removed the high speed relay, which allowed the Omex to control the fans. Now comes on/goes off at the required temps!!
The Ford ECU was controlling the high speed fan relay, and overriding the Omex.
Removed the high speed relay, which allowed the Omex to control the fans. Now comes on/goes off at the required temps!!
The following users liked this post:
bigdel (05-08-2018)
The following users liked this post:
bigdel (05-08-2018)
#13
Advanced PassionFord User
Del there are a few threads about this on the mk1 rs owners site or ask on the imperial blue owners club. From memory it’s something to do with the aircon. Loads of owners have commented on fans continually running. Worth an ask
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bigdel (05-08-2018)
#14
VR46 The G.O.A.T
#15
Advanced PassionFord User
Oh yeah, glad all sorted
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