thanks for the advice but when is it considered to be on time to change the timing belt?

Also i am having problems with the ac again. when it is realy hot the compressor turns on (cold Air comes out) turns of (warm humid air comes out) that is so annoying.

What could be the cause is it a presure valve that is malfunctioning. if so where do i find it and is there a known site or explaination on hor they look or work?

Thank you

Ronny