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Forums › The Car › 206 Problems › Coolant / Fan issues - PLEASE HELP :\ |
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 Posted: Fri Jun 06, 2014 2:29 pm |
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Joined: Apr 03, 2010
Posts: 455
Trade Rating: +8
Location: Ashford, Kent
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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...
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Posted: Fri Jun 06, 2014 2:50 pm |
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Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage
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Disconnect the coolant sensor. Does the fan kick in?
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| 2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible. | |
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Posted: Fri Jun 06, 2014 3:28 pm |
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Joined: Apr 03, 2010
Posts: 455
Trade Rating: +8
Location: Ashford, Kent
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Haven't tried that Ed... what your train of thought on that one?
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Posted: Fri Jun 06, 2014 3:43 pm |
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Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage
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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.
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| 2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible. | |
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Posted: Fri Jun 06, 2014 4:01 pm |
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Joined: Apr 03, 2010
Posts: 455
Trade Rating: +8
Location: Ashford, Kent
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I have started the car with the coolant sensor unplugged and I get the "STOP" lighting up on the dials, but no fan...
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Posted: Sat Jun 07, 2014 5:38 am |
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Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage
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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.
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| 2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible. | |
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Posted: Sat Jun 07, 2014 5:58 am |
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Joined: May 16, 2011
Posts: 495
Trade Rating: +1
Location: huddersfield
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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.
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| 206 2ltr Hdi glx 53 plate | |
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Posted: Sat Jun 07, 2014 7:01 am |
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Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage
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Unplug the resistor and bypass it with a chunky piece of cable.
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| 2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible. | |
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Posted: Sat Jun 07, 2014 8:01 am |
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Joined: Apr 03, 2010
Posts: 455
Trade Rating: +8
Location: Ashford, Kent
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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??
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Posted: Sat Jun 07, 2014 8:22 am |
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Joined: Apr 03, 2010
Posts: 455
Trade Rating: +8
Location: Ashford, Kent
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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....
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Posted: Sat Jun 07, 2014 10:48 am |
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Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage
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I meant bypass the resistor just to test if it's the problem. I don't think it is though.
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| 2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible. | |
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Posted: Sat Jun 07, 2014 10:54 am |
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Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage
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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.
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| 2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible. | |
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Posted: Sat Jun 07, 2014 11:24 am |
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Joined: Apr 03, 2010
Posts: 455
Trade Rating: +8
Location: Ashford, Kent
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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... 
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Posted: Sat Jun 07, 2014 12:22 pm |
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Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage
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Just fix what's there. Standard fan is perfect for standard radiator.
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| 2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible. | |
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Posted: Sat Jun 07, 2014 12:53 pm |
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Joined: Apr 03, 2010
Posts: 455
Trade Rating: +8
Location: Ashford, Kent
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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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