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Dead battery, A/C made horrible noise/smoke after getting started.

24893 Views 23 Replies 14 Participants Last post by  SailorMike
Went out yesterday to a dead battery. My '08 RTL has 200K miles now, and this battery is just 2 years old. Battery terminals were pretty corroded, so cleaned everything up, jump started the truck, and when it started, left it to run for a few minutes to charge battery up. After running for about 30 seconds, all of a sudden there was a horrible, loud screeching sound from the right (front) side of the engine, and what appeared to be a large amount of smoke came out. I quickly shut off the engine, let it sit for a few minutes, then restarted it. Same thing happened again, so I called my Honda dealership to have it towed in. I was afraid the alternator had frozen up (hence the dead battery) and I assumed the serpentine belt was slipping on the locked up alternator pulley.

My great Honda service advisor, whom I've gotten to know quite well over the 200K miles, stopped me in mid sentence and said he knew right away what the problem was. He told me he thought the A/C clutch relay was bad, causing the A/C compressor clutch to stay energized even when the key was off, which was what killed the battery, and that when I jump started it, the noise I heard was the A/C system over-pressurizing and blowing off the pressure, which appeared to be smoke but was in fact freon and oil from the A/C system. He advised me to pull the relay (middle of three small square relays about 1 inch square in the fuse/relay panel under the hood at the passenger side rear of the engine compartment near the firewall). Simple to pull the relay, which released the A/C compressor, drive to the dealership, spend $25 for a new, upgraded relay (Honda has apparently realized a problem exists with the O/E relay), plug it in, and good to go. No problems or noises since, and what great service from a Honda service advisor that could have let me spend $100 on a tow, and another $100 to diagnose. Big thumbs up here. I did not even need to recharge the A/C system, but I suppose that might have been a possibility had it lost too much.
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New part number is 39794-SDA-A05, which is the updated relay, and it cost me $26.71..
curry sells it for around 21, no shipping cost, no sales tax

http://www.trademotion.com/parts/in...&make=Honda&action=oePartSearch&siteid=214999
Wow I had the exact same thing happen to me!! lucky for me when I searched dead battery oud noise smoke

this page popped up otherwise I would have had no idea...

I had assumed that the alternator was going out adn seizing and the bel was being pulle dover a non moving wheel and creating friction and smoke about to catch fire!

and the belt looked like it was gettign rubbed hard as it wa all clean an d balc looking


turns out the smoke was freon and the oil that blew off cleaned the belt to make it look as if it had been rubbed....

what a relief that it is only this relay.....pulled out the offending relay and have had no more problems\

ordered the updated superior relay off the internet for $13 plus $8 shipping orm hondaparts.com or some place like that yo need to get the new and improved Mitsubi relay
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I have a 2009 honda civic EX-L. This post/thread saved me about an incredible amount of money. The A/C compressor clutch relay replacement fixed the issue. I was about to get the car towed in due to the smoke and noise.
Went out yesterday to a dead battery. My '08 RTL has 200K miles now, and this battery is just 2 years old. Battery terminals were pretty corroded, so cleaned everything up, jump started the truck, and when it started, left it to run for a few minutes to charge battery up. After running for about 30 seconds, all of a sudden there was a horrible, loud screeching sound from the right (front) side of the engine, and what appeared to be a large amount of smoke came out. I quickly shut off the engine, let it sit for a few minutes, then restarted it. Same thing happened again, so I called my Honda dealership to have it towed in. I was afraid the alternator had frozen up (hence the dead battery) and I assumed the serpentine belt was slipping on the locked up alternator pulley.

My great Honda service advisor, whom I've gotten to know quite well over the 200K miles, stopped me in mid sentence and said he knew right away what the problem was. He told me he thought the A/C clutch relay was bad, causing the A/C compressor clutch to stay energized even when the key was off, which was what killed the battery, and that when I jump started it, the noise I heard was the A/C system over-pressurizing and blowing off the pressure, which appeared to be smoke but was in fact freon and oil from the A/C system. He advised me to pull the relay (middle of three small square relays about 1 inch square in the fuse/relay panel under the hood at the passenger side rear of the engine compartment near the firewall). Simple to pull the relay, which released the A/C compressor, drive to the dealership, spend $25 for a new, upgraded relay (Honda has apparently realized a problem exists with the O/E relay), plug it in, and good to go. No problems or noises since, and what great service from a Honda service advisor that could have let me spend $100 on a tow, and another $100 to diagnose. Big thumbs up here. I did not even need to recharge the A/C system, but I suppose that might have been a possibility had it lost too much.
I think you just answered my problem - I'm off to get a new relay! Thanks for the very accurate description.
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