All Things Mk5 > How to Guides / Troubleshooting
Coolant temp
lukemk5gti:
Definitely have the same problem. I really don't like paying vw to fix my car but judging by people's reaction to this work I might have to.
Did you just bring it into vw and they determined it was the main thermostat or is this a trial and error approach and you fix one part after another until you fix it?
v4rley:
Pleased you got it fixed :pomppomp: even at that cost :surprised: will be beneficial especially as winter approaches...
chris s:
I wasted my money by changing the coolant sensor first, but if your symptoms are like mine I'd advise going to vw and ask them to change it. I'd prefer to use a good Indy garage too but vw is next to my work now. They did say they had to diagnose themselves but surprisingly they agreed me.
lukemk5gti:
I'll take a look myself tomorrow and if it all looks too much I might just book it in.
My next question if I anyone can answer. Is this sensor not just to show when you get to the ideal operating tempwrature or does it actually cause your engine to operate differently.
For example I'm driving 6 hours but the temp still shows about 80degrees. Will my engine now pump more fuel in to get it up to operating temp?
Does it actually have any detrimental affects?
chris s:
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
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