Hi all,

My S2 N15 sedan has started taking forever to warm up, generally speaking around 20 minutes of driving to even get to past a quarter on the temp gauge. Going down hills etc makes the temperature gauge drop a decent amount also. This has only really started happening after I did a coolant change on the car. I bled it properly using the bleed screws etc. I've done a little bit of reading and am thinking the thermostat may have something to do with it taking forever to warm up? Is there any way to test this without removing it from the engine? Is there anything else I should perhaps look at or test too?

Thanks in advance, Jarryd.