A/C Compressor Replacement '94 Suburban

[east302]

Try RockAuto for part numbers, I guess just select a 1994 K1500 pickup or K-Blazer/Yukon if you want to forego the rear a/c. The RPO code for non-rear air trucks was C60, so if the part says it is for C60 then that should work. C69 is for rear air.

It’d just have the compressor, the manifold hose to accumulator-compressor-condenser, the hose/line between the evaporator and condenser and the orifice tube (which is at the condenser connection on a 98, at least). I think it’s in a different spot on the rear air versions.

Be careful with that firewall connection between the evaporator and accumulator. It likes to seize and can twist the evaporator line apart on a bad day. Same with the line to the condenser. Either one puts you into a dash removal to replace the evaporator.

 

[JWOK]

There may have been some changes in the reman world since I was doing A/C work, but in my experience reman compressors had much higher failure rates than new compressors.

 

[name]

I got my new A/C compressor in, but it does not have a 2 wire sensor on the back (that I believe to be some kind of a pressure switch) like my old one has, It is simply blocked off.

Is this normal, do I have to buy and install this seperatly or Is it only for an R12 system ? this compressor is suppose to be for a 1994 suburban. Just wondering what to do here.

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[PlayingWithTBI]

do I have to buy and install this seperatly or Is it only for an R12 system ?

Yes you need to install the High Pressure Shutoff switch. If you still have the old one, you can use it but, I'd buy a new one IIRC it's off when above 430 PSI and on when below 250 PSI.

 

[PlayingWithTBI]

Here's one off 430, on 200 - my bad

https://www.oreillyauto.com/detail/c/murray-climate-control/murray-climate-control-2-terminal-pressure-switch/mry0/35961/v/a/3015/automotive-suv-1994-chevrolet-c1500-suburban-rwd?q=a/c+high+pressure+switch&pos=6

Edit: looking at your picture of the old one, I'd go new...

 

[name]

got the new cut of switch at AZ and now I am trying to figure out how much oil ( PAG 100 ? ) and how much R-134A to put into this system now that I am deleting the rear air. I am just going to use a block off kit for the rear lines .

 

[smdk2500]

To give you a baseline trucks use 2lbs refrigerant and 8 oz of oil. I am assuming you are basically making it the same set up as a truck correct?

 

[name]

To give you a baseline trucks use 2lbs refrigerant and 8 oz of oil. I am assuming you are basically making it the same set up as a truck correct?

Correct. Just going to use the front A/C only.

would I add all 8 oz of pag oil to the new empty R4 threw the suction port, then vacume down the system ? Would the vacume process draw any PAG oil out ?

 

[smdk2500]

very unlikely that vacuuming it will pull any oil out. I would check and see if your new compressor came with oil in it. I just put one on my 95 yesterday and it came with 7oz oil in it. I was not aware of that but it had a sticker on it telling me that it did. But you can add it through the suction port. I read somewhere that when you put the oil in turn the compressor over sevral times to get the oil moved around inside it. Are you

 

[PlayingWithTBI]

It's better to put 1/2 the oil in the compressor and 1/2 in the receiver/drier so you don't slug the compressor on startup.