SL/R230 2008 sl550 r230 A/C not cold and blowing hot air

Jun 11, 2018 | 10:53 PM

vinhtrandinh

Thread Starter

Newbie

Joined: Mar 2009

Posts: 13

Likes: 5

From: houston, tx

sl550

2008 sl550 r230 A/C not cold and blowing hot air

My A/C is blowing hot air not cold? any advise

thank u

Jun 11, 2018 | 11:28 PM

Rudeney

MBworld Guru

Joined: Dec 2009

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NO LONGER ACTIVE

It could be many things. First of all, set the temperature controls to their coldest setting. See if it changes based on top open vs. closed. If you set the temperature dials to the warmest setting to verify that you get heat. If none of that helps, then my question is, "Are you going to DIY this repair?" If not, take it to a mechanic. If you are going to DIY, the next step is to put gauges on it and read the pressures.

Jun 12, 2018 | 11:05 AM

bobterry99

Banned

Joined: Jan 2006

Posts: 1,982

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From: Atlanta, unfortunately

'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55

I would check high and low side pressures as Rodney suggested. If you haven't got a set of gauges, then consider investing in a diagnostic tool. Among useful statuses Star Diagnosis can display the high side pressure and the control signal the in-dash climate controller is sending to the A/C compressor.

Last edited by bobterry99; Jun 12, 2018 at 09:40 PM.

Jun 12, 2018 | 11:06 AM

bobterry99

Banned

Joined: Jan 2006

Posts: 1,982

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From: Atlanta, unfortunately

'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55

Last edited by bobterry99; Jun 12, 2018 at 09:41 PM.

Jun 12, 2018 | 11:54 AM

57staff

Member

Joined: Mar 2018

Posts: 187

Likes: 34

From: Henderson, NV

2008 CL550

My Mini Cooper would do this almost annually as the clutch on the compressor would go bad. That was the one issue I had with the car. I think since 2009 I went through 4 compressors.

Jun 12, 2018 | 08:06 PM

Aussiesuede

Senior Member

Joined: Jan 2015

Posts: 389

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From: Seattle, WA

SL500

They say a picture is worth a thousand words:

Jun 12, 2018 | 10:01 PM

Rudeney

MBworld Guru

Joined: Dec 2009

Posts: 10,782

Likes: 1,011

NO LONGER ACTIVE

I know a lot of people bad-mouth those recharge kits, but if you know what you are doing with them, they are fine. I will say that the gauges on them tend to be of fairly low quality.

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Jun 13, 2018 | 12:29 AM

Aussiesuede

Senior Member

Joined: Jan 2015

Posts: 389

Likes: 113

From: Seattle, WA

SL500

Quote:

Originally Posted by Rudeney

I know a lot of people bad-mouth those recharge kits, but if you know what you are doing with them, they are fine. I will say that the gauges on them tend to be of fairly low quality.

Yep. Also worth noting for the OP, Is your AC Off button illuminated? When you press it, does the red light extinguish and then relight itself a few seconds later? That's an almost sure sign that you need refrigerant. If the system is just low, then recharging is as simple as adding refrigerant via the port on the left side of the engine bay near the ABC Resevoir. . Just remove the black cap and attach the hose to the port. The can will become very cold to the touch when it's filling That's how you know the refrigerant is indeed flowing. But if it's too low or out, then the climate control computer has to be reset which can be accomplished either with STAR or ICarsoft MBII (I'm uncertain if the iCarsoft i980 can reset the climate control. I know it can read the fault, but don't know if it can cycle & reset it? The MBII & Star definitely can do both)