Pressure in the coolant tank

[bayleif]

Hi All:
I was checking coolant level this morning and I was surprized that when I took the cap off that it had been under pressure. I haven't driven the car in about a week so it was room temp. Is this normal?

Chuck Bartlett
1969 Signal Red 4 Speed

[CarlG]

I don't know if it is normal, but mine did exactly the same thing yesterday when I checked it under the same conditions.  The coolant level was a little low, but the tank bottom was covered.

1967 230sl (stick)

[Raymond]

Indicates you have good caps.  I'd call it normal.  If it was cold when you added your coolant, or when you last opened the cap, there's probably a bit of pressure just because it isn't near freezing now.

Ray
'68 280SL 4-spd Coupe