My A/C works just OK. I want to refill the gas. Do I need to vacuum pump, or can I just refill?

Asked by Jul 27, 2016 at 12:30 AM about the 2005 Mazda MAZDA3 S Hatchback

Question type: Maintenance & Repair

I have a 2005 Mazda 3, hatchback. My A/C has never been maintained, refilled
or
checked. It works just OK, doesn't cool as much as it used to. I imagine the
amount
of refrigerant gas gone down and I need to add some.

Do I need to vacuum pump the gas that's already in the A/C, or would it be OK
to
just add some gas as it is? Also, would I need to add oil? What's the best
practice?

4 Answers

87,075

You really need to get a low and high pressure readings first then if it needs it add the 134 till it comes back too specs. Normally you won't add any oil unless the system is pulled down for repairs and flushing.

When the A/C system is vacuum pumped, does it not need oil afterwards?

I've read in many forums that the A/C systems needs to be vacuum pumped to get rid of the moisture that builds over time. Topping off the A/C with 134 is generally not the best practice they claim. Just curious what others think?

87,075

You only have to replace the oil that is caught by the catch basin on the vacuum pump. You can just top off the 134 once in a couple of years for sure, after that you should have it checked cause there must be a leak.

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