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E34 (1989 - 1995)

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  #1  
Old 09-06-2013, 01:44 PM
Doktor Bert's Avatar
Doktor Bert Doktor Bert is offline
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Location: Palm Springs
 
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E34 A/C Temperatures & Auxilliary Fan Function:

As many of you know, this E34 has been sitting for 3 years. I recently got it going and am slowly starting to work all the bugs out.

Today it is 106F (40% humidity) and I charged the A/C system. This is an expansion valve system, which I do not like nearly as much as CCOT, but nonetheless, I ended up with 48F in the vent idling in traffic (no aux fan) and 40F in the vent @ 45mph.

I may need to do some troubleshooting on the aux fan, but I feel the temps are pretty good...not as cold as my 34F vent temps in my 2001 Mustang with a .047" orifice (CCOT system) but it doesn't vary much and even with no supplemental air it feels good.

Your thoughts on how this compares to the average E34 system would be appreciated...
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Last edited by Doktor Bert; 09-06-2013 at 01:47 PM.
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  #2  
Old 09-06-2013, 01:51 PM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Mein Auto: 1992 525i
E34 A/C Temperatures & Auxilliary Fan Function:

My concern would be your engine temp with AC on, but with a non-functioning aux fan.


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1991 735i - Sold
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  #3  
Old 09-06-2013, 01:52 PM
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E34ZombieHunter E34ZombieHunter is online now
Nothin like an E34
Location: Lillington NC
 
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Mein Auto: 95 540i B/B
Quote:
Originally Posted by Doktor Bert View Post
As many of you know, this E34 has been sitting for 3 years. I recently got it going and am slowly starting to work all the bugs out.

Today it is 106F (40% humidity) and I charged the A/C system. This is an expansion valve system, which I do not like nearly as much as CCOT, but nonetheless, I ended up with 48F in the vent idling in traffic (no aux fan) and 40F in the vent @ 45mph.

I may need to do some troubleshooting on the aux fan, but I feel the temps are pretty good...not as cold as my 34F vent temps in my 2001 Mustang with a .047" orifice (CCOT system) but it doesn't vary much and even with no supplemental air it feels good.

Your thoughts on how this compares to the average E34 system would be appreciated...
Thats about the temps i get. I replaced my fan so it works.
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  #4  
Old 09-06-2013, 01:57 PM
Doktor Bert's Avatar
Doktor Bert Doktor Bert is offline
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Location: Palm Springs
 
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Quote:
Originally Posted by BMR_LVR View Post
My concern would be your engine temp with AC on, but with a non-functioning aux fan.


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Around 177F to 182F today in traffic via a mechanical gauge...
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  #5  
Old 09-06-2013, 01:59 PM
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Most likely the blower resistor...
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  #6  
Old 09-06-2013, 02:57 PM
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Doktor Bert Doktor Bert is offline
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Quote:
Originally Posted by 95-540sport View Post
Thats about the temps i get. I replaced my fan so it works.
I thought that 40F-48F on a 106F day with 40% to 45% humidity was acceptable form an expansion valve system.

Thanks for your input!!!!!
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  #7  
Old 09-08-2013, 06:21 PM
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The E34 must be well insulated as 40F in the vent feels colder than it is!!!!!!
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