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Bubbling from expansion tank!

Old 11-08-2018, 02:01 PM
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Originally Posted by Panzer A4
Coolant cap bad? Maybe it's not allowing sufficient pressure an venting early.
When i tighten the cap on expansion tank, its turning nicely halfway, but the rest its very heave to turn. Can it be the cap or maybe the tank that is damaged from the heat ?
Same when i open the cap its very har to turn at the beginning..
Old 11-09-2018, 12:33 AM
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Sounds normal. But check the threads of both parts to be sure they are okay.
Old 11-11-2018, 02:23 PM
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Originally Posted by Fredrik Maartensson
When i tighten the cap on expansion tank, its turning nicely halfway, but the rest its very heave to turn. Can it be the cap or maybe the tank that is damaged from the heat ?
Same when i open the cap its very har to turn at the beginning..
The pressure relief mechanism has nothing to do with how easy it is to tighten/loosen the cap.
The cap is only ~$20.00.
Old 11-12-2018, 06:37 AM
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Originally Posted by Panzer A4
The pressure relief mechanism has nothing to do with how easy it is to tighten/loosen the cap.
The cap is only ~$20.00.
I have noticed a failure on the coolantflange (inlet beside the sensor) it half broken, can that cause air leakage ? im gonna change that tomorrow.
Old 11-13-2018, 09:12 AM
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Update: i changed the Coolant Temperature Sensor and the Coolant Flange. The change went well and i filled up with coolant and started again.
It took about 5-10 mins and it was up to 90C on the gauge, but no hot air.
Opened the matrix hose and bled the system. Sill no heat, i think its more air inside.

And upper/lower radiator hoses are about 35C.

After a while the gauge was about 110C, but 85 with a lasertemp at the tempsensor hose ?!
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