All Things Mk5 > Mk5 General Area
new mk5 owner
mjmallia:
in-line stat PN is 4E0 121 113
ZoliWorks:
I'll get under my car again and check. What exactly does the inline thermostat do? I've changed the other one since my car was cooling down to 50 degrees when driving at highway speeds but when it comes to heating up, if I idle for 7 minutes or drive for 3, it's already at 90 degrees.
mjmallia:
My understanding of it, is that it allows the turbo to warm up quicker and or the DSG box if you have one, but when they are stuck open it cools the car quicker as everything is free flowing............or if stuck closed overheats.
They are more prone to failing than the main one and often overlooked.
ZoliWorks:
Alright, checked today as I was changing my coolant. I only have the main thermostat, no inline thermostat behind the AC unit or on-top of the gearbox. Car is a 2006 BWA. Looked on the forums a bit and saw that 2006 was when they stopped putting 2 thermostats on manuals and 3 on automatics. 2006+ manuals have only the main thermostat while automatics get an inline thermostat on-top of the gearbox.
mjmallia:
On my ETKA the GTI up to 2007 had the inline. Below is a Golf BWA 2006. The Octavia BWA 2006 has the later Golf 2008 layout weirdly
Near the end of the Mk5 GTI era 2008 it changed the plumbing
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