MkV GTI Cold Melbourne Mornings - Warming Engine Up

**9 iron** · 11-06-2010, 03:32 PM

how long does it take your car to warm up now with colder mornings?

is 25-30 mins too long?

Me thinking thermostat is stuck open.... especially as temp seems to be coming back from 90 on the freeway, to around 75-85.

**wokwn** · 11-06-2010, 03:42 PM

Are you looking at the temp gauge or the HVAC diag channel 19.2

The temp gauge is more of an idiot light, mine points to 90 from actual 75 - 95+ degrees.

But yeah, i'd expect heat from a petrol engine in under 5 minutes with normal driving. Idling, much longer.

**Idle** · 11-06-2010, 04:58 PM

Strangely, a stuck open/corroded away/missing thermostat can also cause overheating — the coolant circulates so fast it doesn't have time to cool properly.

**doink** · 12-06-2010, 11:32 AM

Once the engine warms up, my temp gauge on dash always indicates 90 degrees regardless of outside ambient temperature (40 degree ambient differential between summer/winter). Either the cooling system does a fantastic job of regulating temperature to 90 degrees, the ECU does some adjustment to give the driver piece of mind or my temp gauge is busted and doesn't go past 90 degrees. Is this normal?

**Idle** · 12-06-2010, 12:22 PM

Originally Posted by doink

Once the engine warms up, my temp gauge on dash always indicates 90 degrees regardless of outside ambient temperature (40 degree ambient differential between summer/winter). Either the cooling system does a fantastic job of regulating temperature to 90 degrees, the ECU does some adjustment to give the driver piece of mind or my temp gauge is busted and doesn't go past 90 degrees. Is this normal?

Seems to be — Mk6's do the same thing.

Probably a way to use a cheaper gauge. Presumably it'll go up if the coolant boils.

**Maverick** · 12-06-2010, 12:38 PM

Originally Posted by Idle

Seems to be — Mk6's do the same thing.

Probably a way to use a cheaper gauge. Presumably it'll go up if the coolant boils.

It's there because there are so many stupid owners that would worry if the gauge moved and you'd have posts all over the forums with people comparing their temperature with someone else's and so on. If people weren't so stupid and understood a little more about cars in general it wouldn't be a problem.

**manol** · 13-06-2010, 07:38 AM

Originally Posted by Maverick

It's there because there are so many stupid owners that would worry if the gauge moved and you'd have posts all over the forums with people comparing their temperature with someone else's and so on. If people weren't so stupid and understood a little more about cars in general it wouldn't be a problem.

Well put!!

**number 2** · 15-06-2010, 11:40 PM

Originally Posted by doink

Once the engine warms up, my temp gauge on dash always indicates 90 degrees regardless of outside ambient temperature (40 degree ambient differential between summer/winter). Either the cooling system does a fantastic job of regulating temperature to 90 degrees, the ECU does some adjustment to give the driver piece of mind or my temp gauge is busted and doesn't go past 90 degrees. Is this normal?

On a really really cold night if i sit in my car with the heaters on and at idle for an hour or so the temp gauge will go down. They (1.9TDI) dont make much heat, and after a hard acceleration the heat coming through the vents even with a hot motor is noticebly hotter.