99 blazer air conditioner cold air only after driving for awhile

[karahavingfun]

Hey Guys!

My 99 blazer's air conditioner blows air but only gets cold after driving on interstate for awhile. The ac button blinks red when you try to turn cold air on when going at low speed.

I had it checked with dye for vacuum leak and they claimed it had none?

Any help would be greatly, greatly appreciated!
Kara

[muddog321]

Blazer compressors all die around 80k - not a vac leak but the seals go. Also have had bad pressure switch, connectors with loose pins/fit, etc. If you don't have the smarts on these and I don't - go to an AC shop and save the haedache.

[MT-2500]

Originally Posted by karahavingfun

Hey Guys!

My 99 blazer's air conditioner blows air but only gets cold after driving on interstate for awhile. The ac button blinks red when you try to turn cold air on when going at low speed.

I had it checked with dye for vacuum leak and they claimed it had none?

Any help would be greatly, greatly appreciated!
Kara

Blinking light is usually loe freon.
Get the gauges on it and post back low and high side readings at idle aand at 2000 RPM with compressor running.
You wiill need one of these or one like it.
http://www.ackits.com/merchant2/merc...uct_Code=66773

And say no to them wall mart death kits and or blend freon kits.

Wal Mart DEATH KITS

You cannot properly and safely recharge an air condition system with them.

The one side stop and go gauge does not tell you what your system is doing or is over charged or undercharged.
A overcharged or malfunction air condition system can reach over 500 lbs of pressure.
Enough to blow up that can or system and freeze you at first and the burn you or blind you and if any propane /butane in there blow and light you up.

The stop leak crap and who knows what kind of oil in the kits there will stop your system for sure.
Just like pouring super glue in it.
And some kits even contain freon with a butane mixer.
Good for a big blast.

If you are going to do it do it right and safe.
Here is what you need to start with.
http://www.ackits.com/merchant2/merc...uct_Code=66773

In the older days you could just throw in a can and go.
But over the years just adding freon is getting harder to do.
Newer systems have to have the correct amount of freon down to the ounces.
Most will need pumped down and vacuumed down and the right and amount of oil and a set amount freon charge installed to get the air to cool right and the system to last.
If an air condition is low there is usually a leak that needs fixed and also a lose of lubricating oil from system.
Also air and moisture enters a low system
If you are going to try to do it get the proper type air condition gauge set with the low and high side gauges.
Hook up the gauges and get a reading with compressor running at idle and at 2000 rpm on the high and low side.
Post back pressure reading and we can help you.
MT

[BlazerLT]

Yea, you might need a recharge.

There are a lot of kits with a gauge that will allow you to recharge safely.

http://www.id-usa.com/product.asp?CID=27&PID=20

Has a gauge right on the product to allow the pressure to be checked while filling.

[Cloud Strife]

Well I thought I needed mine to be recharged myself as it was touch and go with the AC as I drove. I replaced my belt tensioner and it fixed my issues. Evidently I just wasn't getting enough tension on my compressor all the time to make it function correctly.

BTW, my 99 Blazer hasn't had anything blow up with the AC yet and I am at 129k miles. I did my own recharge using an Advanced Auto kit. So far so good.

[special tool]

Is your condenser clean? Be sure that when you add freon that you purge the lines so no air gets into the system. 134a likes moisture and when you don't purge the lines air and moisture gets in the system. Over time this amounts to a lot of air and moisture.