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very cold ambient

mak11 on Wed December 17, 2008 11:37 AM User is offline

Year: 1995
Make: Ford
Model: Taurus
Engine Size: 6 cyl
Refrigerant Type: R134
Ambient Temp: 42

What difficulties will I run into when trying to recharge a system in 42 degree temp?


GM Tech on Wed December 17, 2008 12:24 PM User is offline

As long as your tank or can(s) are warm- the refrigerant will flow with ease- you can put in the whole charge without even starting the system---The car's a/c will probably not have enough system pressure to make the low pressure system cut-off switch-or if it has outside temp sensor on a digital climate control- it won't allow a/c usually anything below 40 degrees- so do you intend to see if compressor comes on? or just want to charge it to get it over with?

I did one the other day for my buddy who replaced jis condenser on a 2002 suburban- I charged it in about 45 seconds- it was about 40 degrees outside and in my shop (doors were open) and the compressor never did come on- but it would if and when the truck sees warmer weather- he was happy- so was I- after I told him what to expect. It's no big deal if you charge by weight like I always do-- now if you charge by pressures- then you are in for trouble- you need to be sure to have some way of measuring in the specified amount of refrigerant.

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......

mak11 on Wed December 17, 2008 2:32 PM User is offline

GM Tech
Thanks for the reply.
It completely solved my problem!

mak11 on Wed December 17, 2008 2:43 PM User is offline

Just one more thing.
To charge by weight using a 30LB cylinder,
Do you use some kind of special set of scales to put the cylinder on to measure how much goes out ?
or is it best to just use 12 oz cans in cold weather?

Matt L on Wed December 17, 2008 2:54 PM User is offline

Something like this?

mak11 on Wed December 17, 2008 3:46 PM User is offline

Matt L
That answered my question.

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