Author Topic: TDi running cold  (Read 517 times)

0 Members and 1 Guest are viewing this topic.

Offline RGolf

  • *
  • *
  • Posts: 116
TDi running cold
« on: April 27, 2018, 05:27:17 pm »
Hey tech folk,

I have a 2012 Passat TDi and since itís recent annual service (vw dealer) it has started running cold, circa 65c or around the quarter mark on gauge.

Have had heard this is often more likely the DSG thermostat than coolent, anyone have any experience here?

Thanks heaps

Offline Gordo

  • ##
  • **
  • Posts: 3760
Re: TDi running cold
« Reply #1 on: May 14, 2018, 02:38:44 am »
That would normally be a faulty coolant thermostat - is the heater putting out less heat than normal?
These are my thoughts and opinions - sometimes I'm wrong, but not often ;-)

Offline The Red Warrior

  • **
  • **
  • Posts: 371
Re: TDi running cold
« Reply #2 on: May 14, 2018, 01:58:29 pm »
Also, does the temperature slowly rise if youíre sitting in traffic (or just parked up with the engine running) and then drop again when moving again? Especially moving at motorway speeds?

Offline Alfashark

  • ****
  • ****
  • Posts: 988
Re: TDi running cold
« Reply #3 on: May 14, 2018, 05:01:35 pm »
Hey tech folk,

I have a 2012 Passat TDi and since itís recent annual service (vw dealer) it has started running cold, circa 65c or around the quarter mark on gauge.

Have had heard this is often more likely the DSG thermostat than coolent, anyone have any experience here?

Thanks heaps

Plenty of threads on the Briskoda forum of TDI owners having this issue and 9/10 times it is indeed the thermostat in the DSG coolant circuit.
Oddly enough, most of the dealership spanner monkeys aren't even aware there is such a thing...
'14 Octavia RS TDI
'06 Fabia VRS
'93 CitiGolf 1.6