Individual temperature control intermittant

[colo525i]

More likely a sticky heater valve. Have someone adjust the controls from hot to cold over and over and rap on the heater core with something (hammer pliers etc...) Mine would stick on until i did that, now no problems.

[525SEI BRIT]

More likely a sticky heater valve. Have someone adjust the controls from hot to cold over and over and rap on the heater core with something (hammer pliers etc...) Mine would stick on until i did that, now no problems.

I have have a very simmaler problem, witch bit should i be hitting exactly? sounds like an easy fix as ive already pulled the controls all apart to no avail!