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overheating sensor issue?
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yglx

Posted: Thu Mar 05, 2015 12:50 pm

Joined: Feb 18, 2015
Posts: 28
Trade Rating: 0

Hi guys my car sometimes displays the stop sign when the temp is in the red and I thought I had a duff thermostat until tonight.

Tonight I watched the temp and as soon as it hits 90 it literally pings immediately to red and displays the stop sign. However while it does this I can hear the fan come on and shortly afterwards the temperature falls to about 85.

Am I right in thinking that the coolant temp sensor needs changing? And that my thermostat must be working fine as my fan is coming on? Cheers guys

Edward

Posted: Thu Mar 05, 2015 1:53 pm

Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage

Thermostat is nothing to do with the fan. It just controls coolant flow through the radiator. Coolant sensor operates the temp gauge via the ecu. If the ecu thinks the engine is too hot it switches the fan on.


	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.

Addaz

Posted: Thu Mar 05, 2015 3:01 pm

Joined: Feb 07, 2010
Posts: 7093
Trade Rating: +11
Location: Suffolk

It will be you low speed fan resistor at the front that has failed. About £30 or so Common issue


	Team Impossible Possible The only way of finding the limits of the possible is by going beyond them into the impossible - Arthur C. Clarke Forged 1.6 Turbo Click to see more 144Bhp @ 7PSi - 193.9Bhp @ 13psi 206 Gti Race Car Click to see more For all Race/Track Preparation, Feel Free to PM Me! Whether its for a custom ratio gearbox or track-day alignment, I can help!

MrBSI

Posted: Thu Mar 05, 2015 3:13 pm

Joined: Nov 27, 2010
Posts: 11519
Trade Rating: +10
Location: What's it to you? ? ?

Depending on how small your hand are, what lower grill is fitted & access to a 1/4" socket set, there a doddle to change in about 5 minutes. Undo the 2 bolts that secure the bottom of the bumper & you can then get your hands up there to extract the resistor, the bumper does give enough once the lower edge is unbolted. 1/4" extension fits through the grill nicely to


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yglx

Posted: Thu Mar 05, 2015 4:21 pm

Joined: Feb 18, 2015
Posts: 28
Trade Rating: 0

Low speed fan resistor definitely then? And just to confirm, my car isn't Iver heating? Haha. I'll get it fixed either way as it's very annoying cheers guys

Addaz

Posted: Thu Mar 05, 2015 4:39 pm

Joined: Feb 07, 2010
Posts: 7093
Trade Rating: +11
Location: Suffolk

Yeh i seen it before I never like to say 100 percent, but im near as dammit


	Team Impossible Possible The only way of finding the limits of the possible is by going beyond them into the impossible - Arthur C. Clarke Forged 1.6 Turbo Click to see more 144Bhp @ 7PSi - 193.9Bhp @ 13psi 206 Gti Race Car Click to see more For all Race/Track Preparation, Feel Free to PM Me! Whether its for a custom ratio gearbox or track-day alignment, I can help!

yglx

Posted: Thu Mar 05, 2015 5:19 pm

Joined: Feb 18, 2015
Posts: 28
Trade Rating: 0

Thank you mate and is my engine overheating then or is it still safe to drive? Cheers bud

Addaz

Posted: Thu Mar 05, 2015 5:44 pm

Joined: Feb 07, 2010
Posts: 7093
Trade Rating: +11
Location: Suffolk

Your engine is fine, its just the britron unit/ECU telling you there is a fault


	Team Impossible Possible The only way of finding the limits of the possible is by going beyond them into the impossible - Arthur C. Clarke Forged 1.6 Turbo Click to see more 144Bhp @ 7PSi - 193.9Bhp @ 13psi 206 Gti Race Car Click to see more For all Race/Track Preparation, Feel Free to PM Me! Whether its for a custom ratio gearbox or track-day alignment, I can help!

yglx

Posted: Thu Mar 05, 2015 5:46 pm

Joined: Feb 18, 2015
Posts: 28
Trade Rating: 0

Ok. Awesome thank you in that case I might fully service my car or buy more urgent parts tomorrow instead of replacing this sensor immediately then haha tar mate much appreciated

MUHAMED

Posted: Sun Mar 08, 2015 8:14 am

Joined: Oct 20, 2014
Posts: 39
Trade Rating: 0

first check with multimeter temperature sensor if it shows correct value with temperature. The best is to remove it from the engine and place it in pot with water that slowly raises temperature. The instrument should be in Kiloohm range. Also you will need control thermometer to measure temperature of the water.
iF the water temp. raises than resistance of the sensor must be changed. Observe if the change is continual.
Than using contact spray you can spray wiring (connectors) and apply some vaseline on the contacts.
Those cars have a relay that is mounted on the front plastic. I believe you should remove front grill to access it. Due to corrosion and bad wiring engine can be easily overheated. Check the relay contacts, open the housing and apply contact spray on the relay contacts and wire ends (cable shoes).

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