adding a/c freon
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Advanced
Joined: Apr 2016
Posts: 89
Likes: 22
From: Forest, VA
Had that problem with a Cadillac. Turned on the engine and A/C early in the morning in a cool temperature with the hose connected to the fill valve. Immediately pumped freon into the system and it took the charge up to "normal" operating range before the system shut down.
Attempting to fill the system in the heat of the day cycled off the A/C too quickly for it to accept a charge.
Attempting to fill the system in the heat of the day cycled off the A/C too quickly for it to accept a charge.
Melting Slicks
Joined: Jan 2009
Posts: 3,275
Likes: 739
From: Miami FL
with the previous posts. I just want to add that you shouldn't recharge the system blindly to avoid the risk of overcharging it.Get a set of A/C manifold gauges. Doesn't have to be top-of-the-line and uber expensive. One from Harbor Freight would be fine (or get a free loaner from an auto parts store).
Although not essential, a thermometer will give you a better idea of the A/C system health. You can get for around 5 bucks:
Check both pressures to have an idea of how things are. Take a look at this post. It has detailed instructions to check/add refrigerant.
-These are the CliffsNotes:
Check your pressures against the chart below. Make sure you take your readings with:
- Engine @ 2000 rpm
- A/C in coldest setting
- Fan at maximum speed
- Both windows down
- Thermometer in center air vent
When adding refrigerant, pay attention to both pressures, otherwise you might end up with the high side sky-high trying to get the low side to the chart's value.
Let us know how it goes.
