Headlights keep misting up

[Bumwah]

I have changed the expansion tank and the headlights still mist up.
Any suggestions would be much appreciated

[bigwinn]

I had the same- I’d not replaced the backing covers on the lights properly and it constantly steamed up

Took them off the car and dried them fully

Swapped the left cover seal for the right and vice versa

Worked a treat

[Zulu4]

Or pull the seals out and turn them upside down. I also placed a length of thick string under the seal to pack it out a bit.