V-DubLuv
Veteran Member
Finally got around to swapping thermostats in my Jetta after dealing with slow warm up times and little heat in the cabin. Bought oem parts and went for it.
Pulled the coolant ball and pulled the thermostat and housing. Popped the new parts back in, they can only go in one way, topped off the engine with coolant and went for a drive.
After the drive I noticed there was more coolant in the ball than when I started. I took off the cap and there was a very heavy vacuum/ suction on the tank and the coolant was bubbling. After removing the cap, the coolant began draining out of the ball and it sounded like crackling from coolant going into a sizzling engine block. I've tried burping the cooling system but the lower radiator hose remains empty like there is no coolant getting passed the thermostat.
Is there anything I'm overlooking? Or did I get a bad thermostat that is stuck closed? I've seen thermostats fail "open" as they should, but nothing like I'm experiencing.
Pulled the coolant ball and pulled the thermostat and housing. Popped the new parts back in, they can only go in one way, topped off the engine with coolant and went for a drive.
After the drive I noticed there was more coolant in the ball than when I started. I took off the cap and there was a very heavy vacuum/ suction on the tank and the coolant was bubbling. After removing the cap, the coolant began draining out of the ball and it sounded like crackling from coolant going into a sizzling engine block. I've tried burping the cooling system but the lower radiator hose remains empty like there is no coolant getting passed the thermostat.
Is there anything I'm overlooking? Or did I get a bad thermostat that is stuck closed? I've seen thermostats fail "open" as they should, but nothing like I'm experiencing.