87'300E Defroster

[papadude21]

Finally got the car inspected and on the road. I have a problem with the heat. Have checked other posts but can't find the answer.
1. The heat will come out of dash vents ok (not real hot) guage temp. only gets up to about 55C (probably thermostat)
2. I can't get any air to blow out of the defroster no matter what buttons I push (is it the climate control unit) or???
3. When I push the off button the fan doesn't turn off.
4. Alot of talk about the mono valve. where is it located I can't seem to find it to check the diaphram
Any help or insight's appreciated.