Air condition blowing warm air

2000 MERCEDES BENZ 430E

164,000 MILES • 4.3L • V8 • 2WD • AUTOMATIC

JEEPLYFE

MEMBER
11 POSTS

Air Condition was decently cooling, but I may have possibly (hypothetically) overcharged the A/C system with Freon, it now blows out warm air. Just recently after I noticed that the Cooling Fans were not turning on, I replaced the "aux fan" relay and the fans did turn on again. Now (a few days) after I just put a New relay in, the cooling fans are not working again. Is it a possible "open wire", or maybe the fans are going out, etc.?

Sep 14, 2021 at 4:40 PM

ASEMASTER6371

✓ASE Certified Mechanic
52,796 POSTS

Good evening,

The first thing I need is the Freon pressures for the high and low sides while the engine is running. I need those pressures to see if there is an issue with any of the components.

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Since you added Freon without knowing it was low or not, I would start by recovering all the Freon, evacuating the system, and charging it to the proper amount. I attached a guide for you of the procedure below.

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Let us start here and see if that takes care of the issue. The fans may not be coming on due to low Freon.

Once we get the Freon system working correctly we can continue if there are any other issues.

Roy

Sep 14, 2021 at 4:51 PM

JEEPLYFE

MEMBER
11 POSTS

Alright, I will have to get a Mechanic to check it out, or actually purchase that Pressure kit myself. will be in contact. Thanks

Sep 15, 2021 at 10:59 AM

ASEMASTER6371

✓ASE Certified Mechanic
52,796 POSTS

You are welcome.

Keep us updated so we can continue to help.

Roy

Sep 15, 2021 at 12:27 PM

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