MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: matius344 on December 03, 2025, 09:04:31 am

Title: Heating.
Post by: matius344 on December 03, 2025, 09:04:31 am

Hello Everyone.

My GTI is not warming up when the climate control is turned on.
Every morning I have to turn off the climate control panel to get the engine up to temp and then once it reach 90 degrees I can put I can turn it back on and to Automatic.

I have changed the thermostat to OEM and its still same.

Any other ideas ? Blocked heater matrix ?

The car is manual 2005 ?

Title: Re: Heating.
Post by: mjmallia on December 03, 2025, 12:37:50 pm

You will also have inline thermostats being an early GTI.  Used to have the same issue and kept changing them as they failed every couple of years on me, until I re-plumbed the car to the later design where VW did away with the inline stats

Title: Re: Heating.
Post by: mjmallia on December 03, 2025, 12:40:19 pm

Change the inline stats (one extra one if you have DSG)

Here is my thread on the re-plumb
https://www.mk5golfgti.co.uk/forum/index.php/topic,134325.0.html

Title: Re: Heating.
Post by: matius344 on December 03, 2025, 01:10:56 pm

The problem is I cant find it.

I though they were only been fitted in DSG version of GTIs