Make a donation
« previous next »
Pages: [1]   Go Down

Author Topic: Temp gauge dropping when heaters on  (Read 371 times)

Offline R88TTD

  • Newbie
  • *
  • Thank You
  • -Given: 0
  • -Receive: 0
  • Posts: 2
Temp gauge dropping when heaters on
« on: November 29, 2024, 12:29:34 pm »
Hi guys

I started experiencing new problems with MK5 gti
The temperature gauge drops from 90 to 75 then 50 gradually as soon as I turn my heaters on

Now the heaters are blowing hot air as normal
I asked about and some tell me the battery , some tell me the temp sensor and some are telling me the thermostat, water pump was changed about 15k miles ago so that ruled out

No head gasket issues , no over heating

Just wondering if anyone had this issue before Thanks
Logged

Offline ZoliWorks

  • Always Involved
  • ****
  • Thank You
  • -Given: 5
  • -Receive: 13
  • Posts: 159
Re: Temp gauge dropping when heaters on
« Reply #1 on: November 29, 2024, 03:55:04 pm »
If you want to find out if it's the thermostat or not, go on the highway, drive at a constant 130-140kph without the heater and see if the temp drops. If it does, it's the thermostat.
Logged
Mk5 Jetta 2.0 TFSI BWA | Manual | Mk6 GTI Front | BorgWarner K04 Turbo | Sachs X-Tend OEM+ Clutch Kit | Ta-Technix Air Intake | Ta-Technix 200 Cell Downpipe | Ta-Technix Intercooler | Stock Injectors | Vis Motorsport 175 bar HPFP | 300hp

Offline Octoparrot

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 8
  • -Receive: 102
  • Posts: 1002
    • Email
Re: Temp gauge dropping when heaters on
« Reply #2 on: November 29, 2024, 04:39:27 pm »
I'd put my money on the thermostat.
Logged

Offline mjmallia

  • Won't Shut up.
  • *****
  • Thank You
  • -Given: 3
  • -Receive: 54
  • Posts: 711
Re: Temp gauge dropping when heaters on
« Reply #3 on: November 29, 2024, 06:18:03 pm »
Thermostat for sure
Logged
Mike

South Coast

S3 8L ---- Golf Mk4 GT TDI ---- Lupo GTI ----  A4 B6 Sline ---- Golf Mk5 GTI
Pages: [1]   Go Up
« previous next »