I'm putting a new thermostat in my car every 1-2 weeks. It's getting rediculous. Everytime I take a old thermostat out it is stuck open. Every time. It's getting too cold to ride around with no heat.

She's got a new waterpump, radiator, all new hoses, new coolant temp sensor and coolant switch, 50/50 coolant mix, and I've tried every grade thermostat and it's the same story every time.

It's turbo, on 8lbs, a lot of aftermarket goodies but none of which would mess with the thermostat like that. Coolant remains a neon green.

Any ideas?

I CONTRIBUTED TO THE WIKI!
ah... turbo. I love the turbo, the boost, the speed, the sound.
and its all better when you do it yourself. cheaper too.