Sometimes my car blows hot air...
I looked at it when it did this and the AC compressor was off, and then turned back on a few seconds later... Why??
I just checked the refrigerant and I have a good amount, I don't know why it'd be cutting off-also fan is on during this time as far as I know everything else is working.
I read that if the fan stops, the AC Compressor will also stop for safety issues to avoid high pressure build up but as far as I can tell everything else works just fine.
Any ideas??

 

As long as your sure you have good operating range preasures on both the High and Low side service ports, usually a short compressor cycle is due to a fouled accumulator and/or oraffice tube. The total repair bill will run you about $80, roughly $30 for the accumulator, $2 for the orafice tube, and about $45 for 32oz of 134-A.

Side Note;
If I were you, I would splurge on the orafice tube and get a self adjusting variable tube, this will allow for the coldest air possible reguardless of rpm.

Good Luck and report back.

 

Thanks, I haven't fixed it yet due to a limited budget... otherwise it'd be fixed by now... love my blazer... anyways it got worse and I think I need a new relay?
check out this video of it...
you can see that it cycles between on/off every 3 or so seconds...
also, that noise sounds kinda bad... but its harmless, right?

 

The noise is the clutch bearing, it will only get worse and fail tomorrow, or a few years from now.
I think it may be a plugged accumulator. Someone probably changed the AC compressor without changing the accumulator in it's past.

 

UPDATE:
1-3 days after that video the AC Compressor 100% seized.
went to the mechanic today...
car needs new ac compressor and receiver/dryer-OEM parts-$780 w/recharge
EBrake was hacked-they cut the backing plates to mount-New Ebrake shoes + Hardware + Labor=$315
New rear windshield wiper motor, estimated $400 plus labor.
The dude I bought the truck from cut the backing plates to mount them....
at least my e-brake works... Might go aftermarket on a lot of these parts, AC I guess I don't really need but when I got extra cash I'll get it anyway
so I have some saving up to do...

 

Receiver-drier? What year is yours, because I wasn't aware of the Blazers going to a thermal expansion valve AC system.

 

2000
Honestly, I don't know too much about the AC system, but I'm 99% Certain that I don't need both of those when the only problem is the AC compressor
also how could you cut the backing plates in half to mount them and have them still work?
edit: I do have a receiver though

 

normally when your compressor dies, such as yours, it puts a bunch of metal into the lines. rather than waste time cleaning everything out people just change them. its easier and this way if that stuff gets out of the drier and all that, it wont be able to plug up the orifice tube or go back through the compressor. thats why they are changing it. other wise you will be in and out of the shop with many of the same parts being changed again and again.

EDIT: if you are going to go that far with your air conditioner, you might want to look into changing the condenser as well. i know that its going to make everything cost about 1000 dollars, but then you basically have a completely new A/C system, plus now you would have better cooling because air can get through the condenser to the radiator easier. just my 2 cents, but with not a big pile of money to burn either, it might only leave you with 2 cents.....

 

I'm 99% in disagreement with you on that one. The purpose of a receiver-drier or an accumulator.... as the refrigerant goes through your AC system, it'll change states from vapor to liquid and back to vapor again. By the time it circulates all the way back around to the compressor, it needs to be a low pressure vapor. A receiver-drier (in the TXV system) and an accumulator (in a fixed orifice tube system) contain a desiccant to trap any refrigerant which is still in liquid form.
When you remove your compressor, you'll be opening up the system and allowing atmospheric air in. That's going to cause the desiccant to become fully saturated and useless.