Refills Multi
Refills Multi
Car Air Conditioning and Refrigerant Question?
This is a multi-part question. Thanks in advance for help.
Every now and then the A/C on my 2001 Hyundai Elantra with 70k makes a whirring or high-pitched whining noise. I’m told that this may be because of low r134 refrigerant. And I may be imagining but I think it used to blow colder.
So, here are my questions:
1) How are A/C systems supposed to be maintained? Do you dump (legally, at a mechanic, of course) and refill the refrigerant every few years or do you just top it off when it’s low?
2) Is this something I should do myself? Most mechanics offer A/C recharges but if it’s as simple as picking up a can and doing it yourself, who would pay to have it done?
3) How is it done? I know I need r134. Looking at the AutoZone site I see they have a 12lb and 37lb container. Do I need one of those? Or can I use one of those 1 lb cans?
4) Can I check if I’m low before I make an investment in the stuff?
Thanks and PLEASE ANSWER ALL 4 PARTS OF MY QUESTION.
1) AC Systems are sealed, service (system being evacuated) is only necessary when a component is being replaced (Orifice tube, TXV thermal expansion valve, compressor, condensor, accumulator etc) If the system is low it is topped off.
2) Yes topping off a system is easy, however if You Are a novice you might want to leave this to a professional. Yes Walmart sells a low side (vacuum) gauge and a charging hose, however the high side is also critical to knowing overall system performance. In essence a Manifold at the minimum is required to properly service any AC system, a charging station is optimum.
3) Yes you need R-134, the question is how much do you need AC systems typically hold between 2 and 3 pounds. If you only have one car to charge then cans are fine, the cans are generally 12 ounces and run $6 at wal-mart. I have never seen a 37 lb canister, just 30 lbs the can and outer box weighs about 6lbs There are also 50LB canisters and 20 LB canisters but they are rare.
4) You need at least a low pressure (vacuum) side gauge. The way your question reads does not instill me with confidence in your abilities… but… you should also examine all hoses, fittings and the manifold on the back of the compressor for signs of oil, this would indicate a leak. EPA states that under their service guidelines that a 1lb leak over a 12 month period is permissible, seems excessive to me but hey I don’t write policy for them. If you have a minor leak recharging the system is what I would reccomend.
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