Automotive Air Conditioning Information Forum (Archives)

jfranciose on Tue June 07, 2011 8:30 PM

Year: 1997
Make: buick
Model: lasbre custom
Engine Size: 3.8
Refrigerant Type: 134a
Country of Origin: United States

Have 1997 buick lasabre need to know if there would be power running to compresser i freon level was low

Cussboy on Tue June 07, 2011 9:37 PM

Quote
Originally posted by: jfranciose
Have 1997 buick lasabre need to know if there would be power running to compresser i freon level was low

No. Low pressure switch prevents compressor from getting voltage.-

And your 1997 uses R134a, not freon (R-12).

jfranciose on Wed June 08, 2011 8:43 AM

thanks how would you get the freon to go in if the commpresser doesnt come on due to low freon also have the rightfreon thanks

mk378 on Wed June 08, 2011 9:46 AM

When new parts have been installed, the lines will be full of air, which must be removed using a vacuum pump. Then connect a supply of refrigerant and allow it to flow into the vacuum with the engine off. It will do that just because of the pressure difference-- it works best to turn the tank of new refrigerant upside down and charge as liquid (which is safe as long as the engine is off). That will build enough pressure in the system to close the switch and then the compressor can be started to complete the charge.

jfranciose on Wed June 08, 2011 10:59 AM

Thanks I see what your saying but if you dont have vacume pump can this still work by butting refrigerant in upside down without vacuming it or do you have to vacume it

Cussboy on Wed June 08, 2011 2:35 PM

The air must be pulled out of the system with a vacuum pump before filling with refrigerant for the AC to work decently.

jfranciose on Wed June 08, 2011 3:08 PM

thank you very much ill have a shop do that or can you rent the vacume part from a auto parts store

mk378 on Wed June 08, 2011 5:01 PM

Often you can rent vacuum pumps. You will also need a real gauge manifold and a can tapper. After spending all that money on new parts, it makes sense to get rid of the cheesy hose with the color coded dial gauge and use real pro tools.

jfranciose on Wed June 08, 2011 5:53 PM

ha true thank goodness for warrenties without naming because the compresser that was on was ffairly new parts store replaced everything free only had to buy condenser but defently looking to buy the right tools