My Mk1 running warm

[brackie]

Thermostats are essential. They enable quick warmup and keep the engine running within it's optimum temperature range. If you look at a temp vs engine wear graph you'll understand why the thermostat should never be removed (if you want your engine to last and get optimum fuel economy and performance from it).
Chopping out the centre of the thermostat is an old trick that will increase water flow (slightly) while at the same time giving the restriction that's essential to allow the coolant to stay in the water galleries of the head for long enough to do its job.
If your temp gauge is reading high, then check the gauge's accuracy before you do anything. Use a thermometer in the top of the radiator or degassing tank (whichever) and monitor temp increase against time. This will also tell you if and when your thermostat's opening. If the thermometer confirms overheating with the thermostat open then the most probable cause (as Loon says) is a blocked radiator. Take it out and get it cleaned. While you're at it, put the thermostat in a pan of water on the stove and check its opening temperature.
With all overheating problems it's a process of elimination. Check the easy and cheap things first

[h100vw]

Have a look on ecstuning.com they sell lower temp stats. I am sure they must be available in Australia too. A rad with more capacity will help matters but ultimately VW state that the needle being anywhere on the gauge and the warning light being out is OK.

Gavin

[ausgolfer]

personally am not sure if any aussie mk1's (non gti's) had temp warning lights?? could be gravely mistaken though.