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This is a video tutorial on how to diagnose and fix a AC System in an automobile. We cover how A/C works and what happens when it goes wrong, then how to fix it.
How to Recharge a AC System Yourself:
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How to Jack up Your Car Safely:
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*Disclaimer: Please use all safety precautions
Local Forecast by Kevin MacLeod is licensed under a Creative Commons Attribution license (
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Likes: 6824
Views: 833125
Awesome, this video helped me fix my AC in 102410 minutes!
Forget this just have the mechanics take my money. 🥵. It’s too complicated.
First off, love the channel, and your easy to understand repairs and methods. THANK YOU AND KEEP THEM COMING. My 2002 Merc Benz S430 (W220) A/C stopped working after I replaced the windshield wiper hose (with the heater wire/ cable inside). The unit small red light is on indicating the system works, but will not blow cold air. The clutch does engage, on then off, constantly. The typical reset feature/ trick doesn't work for whatever this error is currently. I checked the relays/ switched and replaced them as well. Assuming the system may have been low on refrigerant, I filled it with what it took in, which appeared to be almost two full "tall" cans of AC Pro. Reset the system and the air came on "absolutely freezing cold" for about two minutes then shut off again. After resetting and attempting to make it stay on, it wouldn't reset anymore after four attempts. I noticed a clear liquid had leaked from the bottom center of the car down the driveway to the rear of the car, no smell or color, but thicker than water.
The next day, with the engine running and the air refilled and reset once more, I heard a loud hissing and bursting flow of air or spray from under the hood, front drivers side for about 40 seconds then stopped. I believe it was a pressure relief vale of some sort !!! Scared the &%$#@^& %$#%^&%#@ out of me to be exact. The clutch still engages, on then off, constantly. Whats wrong with the cars AC ????? What would you recommend I check or replace???? No AC for the past four months now…
Good video , but did not say anything about the drier and the evaporater !
Good posting! I am trying to diagnose the problem on my 2011 E350 Mercedes. Sometimes the AC will not start at all, but if I shut off and turn on the car again, it works fine. Any idea what it can be? Thanks.
I have a bit of an odd situation and thought you might shed some light on it. My wife's 01 Kia Rio at this point cannot accept the 22 ounce full recharge despite replacing the expansion valve and filter drier. I can get about 6 oz or so of freon in and the gauges are reading 30 on the low side and 150 on the high and anything above this reading the compressor starts cycling. There is some cooling but it's minimal. Everything else seems fine. My thoughts are a clogged condenser or weak compressor. The compressor readings do seem to react accordingly to the level of freon. Any help would be appreciated.
My AC stop blowing cold air after awhile of running in 80m/hr but it return after resting while no problem if im running below 60m/hr….. my motor and condenser is new. What might be my problem?
very good video. very thorough, Thank you.
Question: at first the ac light would blink 3 times and then over time it stopped blowing cold. Compressor is working, it’s full of freon, the actuators are not clicking so I don’t think it’s that either. The high pass tube is ice cold and sweating so for some reason it’s not blowing the cold air in the cab. Would the tube be clogged?
I have no no fans blowing air thru the vents