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7 Series - E38 (1995 - 2001)

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  #1  
Old 09-19-2010, 10:51 AM
cop203 cop203 is offline
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Location: nj
 
Join Date: Aug 2005
Posts: 6
Mein Auto: 1998 740il
a/c blowing hot

1998 740 il blowing hot ,I vacumed system no leaks , installed new R134 still hot, also my compressor will stay on even if there is not or very little charge???
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  #2  
Old 09-19-2010, 11:15 AM
balance balance is offline
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Location: NC
 
Join Date: Feb 2009
Posts: 758
Mein Auto: 97 740iL
In between the two vents on the dash is a circular switch that looks like a vent control. Is it turned to the blue side, or is it in the red?
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  #3  
Old 09-19-2010, 11:19 AM
cop203 cop203 is offline
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Location: nj
 
Join Date: Aug 2005
Posts: 6
Mein Auto: 1998 740il
a/c

blue now but switched them to see if there was a change, also checked the ac lines under hood all hot
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  #4  
Old 09-19-2010, 11:35 AM
balance balance is offline
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Location: NC
 
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Posts: 758
Mein Auto: 97 740iL
If your low side and high side pressure lines in the a/c system are both hot, then I'd guess that there either a clog in the system, or the compressor isn't making pressure. But these are just guesses as I'm not too familiar with a/c systems. What I do know is that the low pressure sensor should cut the compressor off if there is low pressure, so if it is staying on even with no charge, then that is odd.

You should take it to a shop that has the pressure guages (if you don't have them) and see what they're reading.
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  #5  
Old 09-19-2010, 02:17 PM
clemaire clemaire is offline
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Location: Apple Valley, MN
 
Join Date: Jan 2010
Posts: 1
Mein Auto: 2000 BMW 740iL
push the snowflake

I had the heat-while-trying-to-cool problem. It went away by pressing the snowflake button so its light goes on, and press the recirculate button to the right of the snowflake until all its lights go out. Let us know if that works for you too. (I think it may "trick" the car into closing the valves from the hot water.)
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