my ac doesnt work nor does the heater. well actually it does when the engine is cold and u push the ac button then it works but not that much of cold air and then the heater works when the engine temp is down too but as the temp goes higher NOTHING works and i am really really in desperate need of ac =[ what could it be can it be? also i just noticed that my temperature thingi on my dash doesnt show nothing and when it does it just shows 136 degrees. can that also be a factor of the problem?? thanks guys for all your input!

oh and my car model and year is 87 300DT