Last month the A/C in my 95 blazer stopped blowing when the setting was on high, but worked in all other settings.
I switched relays with others and even bought a new one but no change so I returned it.
I replaced the setting control switch cause the one installed looked worn. still no go
I then replaced the resistor and nothing,
I then replaced the blower motor and it worked on all settings.

Now a month later, the A/C at random times just stops blowing at any setting. Sometimes just for a second, sometimes a minute but would come back on. A day or two later it again would not blow high but still blows on all other settings and would stop blowing at random times. I thought it may be the blower motor again so I returned it for another new one and worked on high for half the day.

Air blows cold, vacum hoses are all in place and connected it just wont blow when setting on high and stops working at random times. Compressor seems to be working fine and dont see any fuses need replacing also switched around the relays again.

Any suggestions? I live in Phoenix and it is hitting over 110 lately and medium high isnt cutting it. Any suggestions would be appreciated. Thanks in advance

 

Sounds like you have a loose connection somewhere. The resistor only controls the slower speed settings. The relay feeds high speed only.

 

thanks for replying. I just printed out a page to a link that explains how to test to see if relay is getting power. Im going to try it out now. We'll see how it goes. Thanks again