#1: Coolant / Fan issues - PLEASE HELP :\ Author: SinfulDesignCom, Location: Ashford, KentPosted: Fri Jun 06, 2014 2:29 pm ---- Had MOT today (passed!) but during test, the engine dropped half the coolant out as fan did not cut in. Garage wouldn't touch it saying that the fault is the fact that I have done a air-con delete. But it HAS been working fine...
Since, I have accurately measured resistance from the coolant sensor, tested the fan and checked obvious plugs. Fan still not cutting in, but readout of dash appears correct.
But.. when the fan hits 100 deg when it should cut in, I get the diag light on the dash. I have left it running close to the red, but still nothing.
PP2000 gives these faults - could the removal of the air con have done this? Do I need to disable anything? Any help really appreciated as I am on my own on this one...
#2: Re: Coolant / Fan issues - PLEASE HELP :\ Author: Edward, Location: In the garagePosted: Fri Jun 06, 2014 2:50 pm ---- Disconnect the coolant sensor. Does the fan kick in?
#3: Re: Coolant / Fan issues - PLEASE HELP :\ Author: SinfulDesignCom, Location: Ashford, KentPosted: Fri Jun 06, 2014 3:28 pm ---- Haven't tried that Ed... what your train of thought on that one?
#4: Re: Coolant / Fan issues - PLEASE HELP :\ Author: Edward, Location: In the garagePosted: Fri Jun 06, 2014 3:43 pm ---- It's the car protecting itself. If it can't tell how hot the engine is it should switch the fan on to make sure it doesn't overheat. It plays it safe.
#5: Re: Coolant / Fan issues - PLEASE HELP :\ Author: SinfulDesignCom, Location: Ashford, KentPosted: Fri Jun 06, 2014 4:01 pm ---- I have started the car with the coolant sensor unplugged and I get the "STOP" lighting up on the dials, but no fan...
#6: Re: Coolant / Fan issues - PLEASE HELP :\ Author: Edward, Location: In the garagePosted: Sat Jun 07, 2014 5:38 am ---- Have you tried sending a +ve feed direct to the fan? Chances are it's just a knackered relay or the wiring into the relay is badly corroded.
#7: Re: Coolant / Fan issues - PLEASE HELP :\ Author: DREWDEN, Location: huddersfieldPosted: Sat Jun 07, 2014 5:58 am ---- Wonder also if the resistor is kaput, mines kaput and disconected at the moment and joined together, meaning no air con (slow speed fan) and just the high speed fan working.
Temperary measure till i get time to take bumper off to replace the resistor.
#8: Re: Coolant / Fan issues - PLEASE HELP :\ Author: Edward, Location: In the garagePosted: Sat Jun 07, 2014 7:01 am ---- Unplug the resistor and bypass it with a chunky piece of cable.
#9: Re: Coolant / Fan issues - PLEASE HELP :\ Author: SinfulDesignCom, Location: Ashford, KentPosted: Sat Jun 07, 2014 8:01 am ---- Thanks for replies guys.
This is a good idea - just bypass all this stuff altogether. But the sensor works on resisting the voltage - dropping from around 1.4v ~ 0.3v (which is when the fan *should* cut in). I will need a separate sensor which will switch the relay to +12v.
Unless anyone can think of an alternative??
#10: Re: Coolant / Fan issues - PLEASE HELP :\ Author: SinfulDesignCom, Location: Ashford, KentPosted: Sat Jun 07, 2014 8:22 am ---- I am not with the car otherwise I would check, but am I right in thinking that the dash requires the coolant sensor - or does it come from another sensor? Just thinking I could use the tap in the thermostat housing for the new switch....
#11: Re: Coolant / Fan issues - PLEASE HELP :\ Author: Edward, Location: In the garagePosted: Sat Jun 07, 2014 10:48 am ---- I meant bypass the resistor just to test if it's the problem. I don't think it is though.
#12: Re: Coolant / Fan issues - PLEASE HELP :\ Author: Edward, Location: In the garagePosted: Sat Jun 07, 2014 10:54 am ---- The coolant sensor operates the gauge via the ecu. When it gets hot the ecu switches on one relay which is wired through the resistor which reduces current to the fan meaning it spins slowly.
At higher temperatures the ecu switches the other relay which isn't connected to the resistor meaning the fan runs at higher speeds.
#13: Re: Coolant / Fan issues - PLEASE HELP :\ Author: SinfulDesignCom, Location: Ashford, KentPosted: Sat Jun 07, 2014 11:24 am ---- Righto - makes sense Ed.
I did test the resistance and there was nothing there. Problem is, when I trained, ECU and such were in their infancy, so a problem like this was very simple - fuse, fan, relay or switch!
I have decided to put a new electric fan in - lighter, more efficient cooling and less drain on power. Will take a bit of wiring but at least I won't have to worry about all the ECU b*ll*cks...
#14: Re: Coolant / Fan issues - PLEASE HELP :\ Author: Edward, Location: In the garagePosted: Sat Jun 07, 2014 12:22 pm ---- Just fix what's there. Standard fan is perfect for standard radiator.
#15: Re: Coolant / Fan issues - PLEASE HELP :\ Author: SinfulDesignCom, Location: Ashford, KentPosted: Sat Jun 07, 2014 12:53 pm ---- True enough, but I was only thinking that while everything else is out of the way, it would be logical. Only a matter of time before a 11 year old fan has its day...
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