Intermittent AC?
Thread Starter
Junior Member
Joined: May 2016
Posts: 36
Likes: 2
GL450
Intermittent AC?
2007 GL450 with 140K miles on it. I'm learning to take care of this vehicle myself as the cost of bringing it to the dealership with every problem would lead to bankruptcy 
My AC will blow ice cold when I'm driving down the highway or when engine RPM's stay up at 2000 or higher. Then when driving it from light to light, I smell an odd smell and it starts to blow warm.
Any thought or ideas as to where to start looking? Thank you so much for your opinions and knowledge!
My AC will blow ice cold when I'm driving down the highway or when engine RPM's stay up at 2000 or higher. Then when driving it from light to light, I smell an odd smell and it starts to blow warm.
Any thought or ideas as to where to start looking? Thank you so much for your opinions and knowledge!
Senior Member
Joined: Aug 2014
Posts: 336
Likes: 46
gl450 530i
i wouldn't necessarily jump the gun and say low on charge as he said it works when he is moving and not when he is stationary, i have never had this issue on mine and im at 170k but you see these alot more than i.
MBWorld Fanatic!
Joined: Dec 2004
Posts: 4,268
Likes: 253
low rpms - low pressure - high rpms - higher pressure. low charge - low pressure. low charge + low rpms - insufficient pressure.
attach manometer on low side shraeder valve. turn on ac to max. i bet donuts to dollars he will not see sufficient pressure - 35-40 psi at 70 degrees ambient.
attach manometer on low side shraeder valve. turn on ac to max. i bet donuts to dollars he will not see sufficient pressure - 35-40 psi at 70 degrees ambient.
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Member
Joined: Mar 2016
Posts: 87
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2010 GL350
low rpms - low pressure - high rpms - higher pressure. low charge - low pressure. low charge + low rpms - insufficient pressure.
attach manometer on low side shraeder valve. turn on ac to max. i bet donuts to dollars he will not see sufficient pressure - 35-40 psi at 70 degrees ambient.
attach manometer on low side shraeder valve. turn on ac to max. i bet donuts to dollars he will not see sufficient pressure - 35-40 psi at 70 degrees ambient.
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