Automotive Air Conditioning Information Forum (Archives)

rastoma on Sun June 05, 2011 1:25 AM

Year: 1993
Make: Cheverolet
Model: S10 Blazer
Engine Size: 4.3
Refrigerant Type: R12
Country of Origin: United States

On a stock 1993 S10 Blazer 4.3 with 4WD, where is the location of the orifice tube and how is it removed? Does anyone happen to have a video link or pictures showing the location and removal process?

Second, I want to convert over to R134a. Is there an alternative orifice tube to replace it with when going to R134a?

Edited: Sun June 05, 2011 at 1:26 AM by rastoma

bright41 on Sun June 05, 2011 4:11 AM

r12 you can still get keep it factory oem and you wont have problems and you wont have to flush and drain all the mineral oil out and change over to pag 150 and with 134a you need to add a high presserue cut out swtich plus you have to change your low pressure to a adjustable one the r12 low pressure swtich isnt setup for 134a so it will be cycleing too soon

rastoma on Sun June 05, 2011 7:41 AM

The reason I was going to convert it is because there is a very slow leak in the system. The compressor is still good though but I do not know yet where the leak is. I don't see any obvious oily/greasy looking areas at any of the connections.

If I keep it R12 I'm sure the factory orifice tube would need replacing wouldn't it?

I would still like to weigh both options. This 93 Blazer has 108k and doesn't use or leak a drop of oil and runs like a champ. Transmission shifts like a new one (after running AutoRX through it It get's driven once or twice a week. I put about 11k miles a year on it. I hope to continue driving it another 5+ years. The one thing I would see going out, since there's a leak somewhere, is the compressor. So I'm just trying to figure out what would be the most economical in the long run and hoping to do most of the work of myself.

Edited: Sun June 05, 2011 at 7:48 AM by rastoma

GM Tech on Sun June 05, 2011 9:27 AM

Compressor shaft seal is most likely the leak source.

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......