All Things Mk5 > How to Guides / Troubleshooting
Coolant temp
GrayMK5GTI:
--- Quote from: chris s on October 03, 2014, 09:09:01 pm ---I'm no expert but I would have thought it would be like running with a choke out?!? Ie possibly over fuelling and I think the ecu holds performance back a litt but could be totally wrong
--- End quote ---
I think your right. Mine was definitely holding back when the stat was busted
lukemk5gti:
So I spoke to VW about it and they said it's 3 hours work so total cost is just shy of €400!!!!!
From the thread I've gathered that I won't (which I don't) get an error code but I can have VW live read with VCDS to see if the main thermostat if relaying info.
I've booked in for laser alignment with VW on Friday so they said they can scan it then and find out if it is at fault.
In terms of the work, I've changed brakes, suspension, dv and all service items on my car. Should I tackle the main thermostat myself or is it too much of a heartbreak and am I better off getting VW to do it?
chris s:
That's very high, I had mine done at VW Benfield in Newcastle for £224, and beeline it is about 3hrs work, and not easy work, so depending on how competent you are with some spanners I'd get the garage to do, but it's your call. Maybe suggest they contact the place I had it done for a price match?
OllieL:
--- Quote from: Dan_FR on September 23, 2014, 08:12:08 am ---Thermostat as said above. You could have verified the sensor was working correctly with VCDS before rushing out to buy new.
Don't rely on fault codes for errors, live data reading of measuring blocks is far far more useful
--- End quote ---
Sorry to resurrect this, but which blocks show the water temp sensor readings?
Am going through the same process and I have the error code P1285 (engine coolant sensor 2 circuit high, lower limit not reached) with fans running constantly.
I’m hoping this is just an over cooling issue with fans running maximally all the time, but would really appreciate guidance of which blocks to check for sensor data.
Thanks
Ollie
pudding:
What scan tool do you have? You can't miss coolant temp with VCDS under advanced measuring blocks, it's one of the first ones in the list.
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