SL/R231: Electric air control valve in engine bay
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Junior Member
Joined: Jun 2015
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1998 SL500, 2004 SL500, 1966 Mustang GT convertible, 2009 Jeep Wrangler 4 door limited X,
Electric air control valve in engine bay
There is an electric control valve on ht e drivers side by the strut tower than makes a clicking sound when the engine is running. My r129 does not make is quiet. What is the valve and what does it do? I believe it needs to be replaced due to the noise it makes.
Thread Starter
Junior Member
Joined: Jun 2015
Posts: 43
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1998 SL500, 2004 SL500, 1966 Mustang GT convertible, 2009 Jeep Wrangler 4 door limited X,
I was able to determain that the valve is fuel purge valve. I ordered a replacement, I do not know if the valve is suppose to make a constant clicking sound. At times it does stop clicking. Most of the time when the engine is running it constantly clicks on and off. It is noisy.
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Joined: Oct 2009
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From: Everett, WA
14 E63S Wagon, 16 GTS Edition1 (Sold), 17 SL450 designo edition
I don't know how far away your next nearest dealership is but I would at least give them a call and see what they have to say about it.
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AMG GTC Roadster, E63s Ed.1, M8 Comp. Coupe
The OP mentioned that he had a R129 SL. That would be a 1989-2002 SL. Different car.
That said, The ticking sound for a purge valve is normal behavior. Remember that from our older MB's. They tick for a little while and then stop...
That said, The ticking sound for a purge valve is normal behavior. Remember that from our older MB's. They tick for a little while and then stop...
Thread Starter
Junior Member
Joined: Jun 2015
Posts: 43
Likes: 2
1998 SL500, 2004 SL500, 1966 Mustang GT convertible, 2009 Jeep Wrangler 4 door limited X,
I own a R230 and a R129. I replaced the purge valve, the new one is not noisy like the old one. The old one you could hear from outside the car with the hood down.
