I am a farmer and i have all the airconditiong equipment.

I fill the air conditiong up on the farm and i was wondering if someone could telll me how to do it on a 97 gm pickup.

It is a r134 system, I cam see where the blue hose goes ect. However on a tracker there is a window that you use to fill the r134, I was wondering how much pressure i should run.

Or is it better to just bring it to the dealership.

Thanks.

HG

Way safer,and better to go to someone that does it for a living(IMHO)Proper pressures for that truck in the heat of summer would be 30-35psi low side(blue side,and 175 to 250 high side(red valve).A full system would read outside air temp ie 90 psi on a 90 degree day.Chec to make sure the plug on the cycling switch(which is on the rec-drier)does not have loose terminals,very common on that model.should go to the shop though,just be safe.

Is the system empty? If so there should be a spec on the evaporator housing (like 40 onces for example) just fill it up to the specified amount on the low side (blue)

im sure if you do a let's just handle this as a do it myselfer type of repair it could land you in jail.

Originally posted by paul yarek@Aug 10 2005, 12:59 PM
im sure if you do a let's just handle this as a do it myselfer type of repair it could land you in jail.
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Is it illegal to charge your own A/C in Canada?

It not in the states you can buy R134 at any auto parts store.

Yep, it's illegal! Have to gave a certified license to buy the refrigerant.

Originally posted by CORY9@Aug 10 2005, 07:47 PM
Yep, it's illegal! Have to gave a certified license to buy the refrigerant.
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i know and we really don't need the ozone layer anyways. :huh:

Originally posted by CORY9@Aug 10 2005, 07:47 PM
Yep, it's illegal! Have to gave a certified license to buy the refrigerant.
427400

i forgot and along with the licence you are to have all the up to date recapture equipment before you can just up and buy a bottle of refrigerant.

The new style refrigerant is R-134A , not Freon based and non harmfull to the enviroment. If the evaporator has to come off 2 ounces of refrigerant oil should be addded as well. The dodges are notourious for getting pin holes in the evaporator. A sealer can also be used that will work as long as your system will hold pressure for at least a day. I hear this will VOID warranty though. They also have a dye that it can be pumped with that can be seen with a black light, to find where the leak is. It didnt work for me, :(

There is a new product up here in canada that you can by at any parts store it is called "DURA-COOL" It is a propane based product so no special license is needed to buy it or use it. It is compatable with the old R-12 and R-134.

Originally posted by mr670@Aug 12 2005, 04:32 PM
There is a new product up here in canada that you can by at any parts store it is called "DURA-COOL" It is a propane based product so no special license is needed to buy it or use it. It is compatable with the old R-12 and R-134.
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Yes, its compatible BUT, the system must be prepared to handle it. Any system should be recovered first, the contents weighed and compared to fill specs to see just how much refrigerant has been lost. If the system is dead empty, refilling it won't last very long. Just "topping it up" is not a safe service routine for the system. Over charging it can blow the compressor up, under cgarging a 134 system can starve the compressor of PAG oil and wiper it out as well. Just stuffing some Hydro carbon based refrigerant into a partially charged 134 system or r12 system is begging for a complete system disaster.
Before charging any system, it needs to be recovered, then evacuated on a proper vacum pump to 25 inches vacum minium for at least 30 mins to remove moisture from the system. Then and only then should the proper weight of refrigerant be installed in the system.

Remember, if switching to a hydrocarbon based gas, approximately 1/3 of the total weight charge of refrigerant is used. Any more and the system will freeze up or explode the weakest component in the system. The old PAG oil needs to be removed and mineral oil added to spec as well.

Although r134a ia not a chloroflourocarbon( ozone depleter) it is suspect of being carcenogenic( MAY CAUSE CANCER) SO DON'T GET COMPLACENT WITH IT.

Originally posted by permafrost@Aug 11 2005, 07:41 AM
The new style refrigerant is R-134A* * , not Freon based and non harmfull to the enviroment.* If the evaporator has to come off 2 ounces of refrigerant oil should be addded as well.* The dodges are notourious for getting pin holes in the evaporator.* A sealer can also be used that will work as long as your system will hold pressure for at least a day.* I hear this will VOID warranty though.* They also have a dye that it can be pumped with that can be seen with a black light, to find where the leak is.* It didnt work for me,* :(
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AVOID SEALERS LIKE THE PLAGUE unless you are getting rid of the vehicle and want a/c to enhance sale price. Most shops will test for a sealer in the system and refuse to service the a/c ever again if its found to be in the system. The sealer destroys recovery equipment.