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Mk5 General Area / Re: Heating.

« Last 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

Mk5 General Area / Re: Heating.

« Last 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

Mk5 General Area / Re: Temp gauge dropping when heaters on

« Last post by matius344 on December 03, 2025, 11:54:36 am »

Quote from: Mk5gti on August 28, 2025, 08:12:16 am

So my issue is the needle drops when I turn heaters on
Both thermostats have been done and temp sensors using genuine parts, while driving the needle doesn’t drop, the needle will only drop at idle with heaters on

I got the same issue.

Anyone ? Oher ideas than Thermostat or temp sensor ?

Mk5 General Area / Heating.

« Last 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 ?