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anyone else gettin horrible mpg with the ac on?

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  #1  
Old 08-18-2007 | 04:23 PM
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Default anyone else gettin horrible mpg with the ac on?

I use to be able to go a month on a full tank. now it seems im going through something like 20-30 every few days. i use to drive around with the windows down but lately its been so hot ive had the ac on. anyone encountering the same or similar thing? ive heard of the ac lowering the mpg but not by as much as im getting
 
  #2  
Old 08-18-2007 | 04:35 PM
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Default RE: anyone else gettin horrible mpg with the ac on?

My AC affects my MPG very little.
 
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Old 08-18-2007 | 04:45 PM
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Default RE: anyone else gettin horrible mpg with the ac on?




What are you getting and what engine do you have?


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Old 08-18-2007 | 04:48 PM
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Default RE: anyone else gettin horrible mpg with the ac on?

I don't care if I get worse mileage because of my AC... Here in Az it's either run your air, or die!
 
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Old 08-18-2007 | 06:21 PM
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Default RE: anyone else gettin horrible mpg with the ac on?

Sounds like your compressor is having to work harder for some reason. Maybe the pulley bearings are starting to stick or maybe the compressor is starting to crap out. Its hard to say, have to narrowed it down to the AC being the only factor?
 
  #6  
Old 08-18-2007 | 07:31 PM
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Default RE: anyone else gettin horrible mpg with the ac on?

Well, according to my scan gauge, at steady highway speeds I lose approximately 3.5 mpg with the AC on.
 
  #7  
Old 08-19-2007 | 08:08 AM
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Default RE: anyone else gettin horrible mpg with the ac on?

'Summer blend' gasoline also has less Btu per gallon
and gives worse MPG.

The Dodge Ram 'blend door' in the HVAC system
is also a wasteful way to control air temperature
where very hot air from the constantly running coolant lines
is blended with AC flow to adjust temp
 
  #8  
Old 08-19-2007 | 11:08 AM
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Default RE: anyone else gettin horrible mpg with the ac on?

ORIGINAL: HankL

'Summer blend' gasoline also has less Btu per gallon
and gives worse MPG.

The Dodge Ram 'blend door' in the HVAC system
is also a wasteful way to control air temperature
where very hot air from the constantly running coolant lines
is blended with AC flow to adjust temp
he never mentioned it not cooling properly...
 
  #9  
Old 08-19-2007 | 01:00 PM
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Default RE: anyone else gettin horrible mpg with the ac on?

Here in AZ you can't help but run your AC when ever you drive so you just deal with it
 
  #10  
Old 08-19-2007 | 02:18 PM
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Default RE: anyone else gettin horrible mpg with the ac on?

ORIGINAL: HankL

The Dodge Ram 'blend door' in the HVAC system is also a wasteful way to control air temperature where very hot air from the constantly running coolant lines is blended with AC flow to adjust temp
That's how virtually every import HVAC system has worked since the late 80s and probably every domestic starting a few years later.

The only alternative is a cable-controlled valve under the hood that sends coolant through the heater core. You want that back? They have to keep the AC running and add warm air to it so it continues to provide air at the temp you want that is also dehumidified. Cycling the compressor wouldn't accomplish that.
 


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