Hey everyone,
This forum is great and I have been searching through posts to see if I can find an answer but I am probably going to confuse myself. I can't get anything to work but the defroster. The ac wont kick on and the vents don't work. I have checked under the hood for broken vacuum lines and can't find any. I have pulled the control switch out and all the lines are connected. I really miss the vents and it is going into ac season. What do you think. Oh, the ac unit was replaced last summer and it worked.

 

Do you have vacuum at the control switch in the dash? If not, then you have a broken vacuum line...

 

Did you say you have no A/C or it just doesn't blow out the vents properly? You have defroster. When the A/C is on is it cold air at the defroster? Also what year is your truck?

 

I have a 95 blazer. The ac doesn't come on at all not even out of the defroster. I need a tool to check the vacuum at the control switch, right?

 

So... Does the air go to the appropriate vents when you switch the controls? If not, you still have a vacuum problem.

About the A/C not working, have you checked the level of charge in the system?

 

So, I found a broken vacuum line and repaired it. I still only have air coming out of the defroster. AC still doesn't kick on. I guess I still have a leak somewhere. When I turn the selector switch I hear clicking so I guess the controls work. Where can I find a vacuum diagram for my 95 Blazer?

 

The schematics posted in THIS POST for a '97 should be the same as your '95.

 

My personal weapon of choice for these things is a hand held vacuum pump/gauge. I have a Mity-Vac but you need one to pump up to around 15"Hg (mercury). You can remove the lines and check each actuator individually or find the main vacuum source and work the whole system (just takes a little longer) You should be able to do a leakdown check. Pump up the system to (recommended) 15" and once everythong settles down it should hold vacuum. If not then you can start isolatimg things for problems. You might check the vacuum tank (ball) for leaks or a loose line. As far as your A/C goes to see of your compressor is working turn on the A/C (engine running) and jumper the two pins on the low pressure switch at the receiver/drier in the engine compartment (disconnect before you start the engine). This puts power to the compressor magnetic clutch. These are quick tests and should point you in the right direction. Don't know how familiat you are with your system. Let us know.

 

Swartlkk, thanks for the schematic. Gimpy Blazer, thanks for the suggestion.