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sprinkles08, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 22999
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Ml 320: , I'm having some issues with my air-conditioning

Customer Question

Hi, I'm having some issues with my air-conditioning on my 99Mercedes ml 320 , I'm not getting cold air , it blows only hot air , also notice my condenser fan is not working . also I checked the fuses box and notice the fuse of fan was burn so I replace it , I notice as soon I put it in it blows up . can you help
Submitted: 2 years ago.
Category: Mercedes
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to JustAnswer!
The fan is necessary to keep high side pressure down for cooling at stops and low speeds but the compressor would still engage and blow cold initially. It sounds as if the compressor isn't engaging, either due to the fuse blowing, a pressure sensor issue, possibly the control head, etc.
What was the reason for replacing the compressor?
Does the compressor ever engage? Did the old one engage?
If you leave the compressor unplugged does the fuse still blow?
You used a recovery machine to charge the system to the proper weight?