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My AC wasn't working so I thought I needed more freon but when I tried to fill it the gage was in the red. What's wrong with it?

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D Aubrey
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  • Cars & Trucks Master
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On your gauge,is "red" high pressure or low pressure?
If you are seeing a high pressure on your low side connected gauge and the compressor is not running,that is a "full charge" or better stabilized in the system.If your compressor is not "kicking in" you may have a defective electrical component in the A/C system.With the engine running,you can jump 12v power the the compressor clutch momentarily just to see if it is working.Don't leave it jumped to long as the system is designed to cycle with pressure from the low side pressure switch which is the next place to check and the compressor can also be jumped at the low side switch.
If your "red" is low or no pressure,then you have a leak and repairs to the system to stop the leak will have to be made.You can add 134a at this time with the engine running and A/C requested,and as pressure rises in the A/C system,the compressor should "kick in" and cold air should start flowing in your dash vents.45 degrees at the dash vent airflow temp usually equals a full charge.
DO NOT add any aftermarket "134a" that shows an EXPLOSIVE label on it.These are not 134a and are usually butane and/or propane mixes that you MAY NOT want spraying on you in a collision/any situation where the A/C system has become ruptured/compromised.

Posted on Apr 24, 2017

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1 Answer

Refilled air conditioning gage read a little low but when I filled it with less than a quarter of a small can it read in the red now the car wont turn over at all
Try turning off the ac and then try to start the car. If it starts then you have too much freon in the system. If not you may have plugged in to the fuel rail.

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Assuming there are no leaks, you could just need a little freon. But, If the fan (on the radiator) is not kicking on then your compressor may not come on either as it needs the fan to run to help keep the compressor cool. Typically it stems from being low on freon though and Autozone sells freon you can self administer but I would advise asking someone familiar with adding freon to help you so that you don't over fill or try to fill it from the wrong port.

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Hello i have a question i just bought a 2000 ford expedition and the person i bougt it from didnt run it for about 4 months and when we crack it up the ac didnt work we put atifreeze and still didnt work...
add R134a freon and use a fill hose with a gage and keep in safe range. Keep can upright to fill system as a gas. Inverting will send a flood of liquid freon in - not good.
Can you hear the a/c clutch engage and disengage a few times/minute?

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AC compressor works but cool air does not come out.
it sounds like you are low on freon. to check this you will need to follow the ac lines until you find one with a cap on it you will need to take off the cap and attach a gage that will tell you if your freon is low you can usually get a gage when you get the freon. make sure you don't over fill the system if you so the compressor still won't work and you could wreck something in the system.

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My ac went out on my 98 cadi deville a few month ago. It just tells us low refridge. we tried to put some more in and the gage to fill it up says it is still full. but since then my econ/vent; heater; rear...
on those caddys you disconnect the battery and wait a few seconds and reconnect and it will reset ac system. when it goes into service mode the system just shuts down. the battery procedure is how to reset. when the ac compressor is not engaging you will not get an accurate reading on your gauges. it might be low but the compressor must be engaged for the system to take more freon.

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Air conditioner gets hot on passenger side while drivers side is
either your R134a is leaked out ore you need add and also add a dye see if leaks.
Add to the low side the car while running with gage with ac cranked on high follow metter dont over fill it loc the ac up. Easy 20 minute job wallmart sells the gage and R134s and so do auto zones

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Not blowing cold air !!
You need check the level with a gage while its on and blowing high on the low side the ac.
either it need R134a added ore you might have leak. Best thing is check the level first and if low add the dye to see where leaks out and then top off the ac until full but you cant over fill it ore it loc up the ac pump

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A/C is only throwing warm air. Where do I put
check the low side of the jeep while it running and see what reads with a gage for R134 dont over fill it put correct amount in if that dosent work the compressor got problems. R134 eats seals and cause major problems in the compressors
If you over fill locs up the ac compressor ok

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My ac doesnt work in my 2001 tahoe. i bought freon for it. the compressor is not kicking on when i turn the ac on, but the gage shows in the red when i hook it up to try and put freon in it. i shot a...
the a/c system needs a minimum pressure before the system will run. the system must have a leak so just buying freon may last a day or a few months depending on the size of the leak. also leaking freon into the air is ozone depleating, it should be recovered properly.

the system needs to be recoved of all freon. vacuum to -30psi held checked for leaks. (uv dye or nitrogen and soapy water). leaks fixed. vacuum to evacuate moisture and air. refilled with proper amount of freon (too much or too little make the air not as cold).

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