hot air? - BMW M5 Forum and M6 Forums
E34 M5 Discussion 1988-1995 Sedan and Touring

 
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 9 Old 3rd November 2006, 09:34 AM Thread Starter
hoyleyboyley
Member, Sport: Off DSC: On (>50 posts)
 
Join Date: Dec 2005
Location: blackfen, SE london
Posts: 78
Thanks: 0
Thanked 0 Times in 0 Posts
hot air?

had my a/c regassed, new compressor, fan etc in the summer (to the tune of £500) all good - air is ICEY cold. 8-)
thing is, now the weather taken a turn, if i turn the heat on both sides up to max (28°) it doesnt seem to get that hot... now it wasnt uncomfortably cold in the car (3° external), but TBH i'd expect the air coming out the vents to feel warm/hot.
anything it could be?

ta
hoyleyboyley is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 3rd November 2006, 10:11 AM
M540i LE
m5board.comoholic (>1000 posts)
 
M540i LE's Avatar
 
Join Date: Jun 2004
Location: Hobart, Tasmania, Australia
Posts: 1,748
Thanks: 10
Thanked 31 Times in 24 Posts
make sure the wheel in the middle of the 2 central air vents is turned to maximum red.

Quote:
Originally Posted by hoyleyboyley
had my a/c regassed, new compressor, fan etc in the summer (to the tune of £500) all good - air is ICEY cold. 8-)
thing is, now the weather taken a turn, if i turn the heat on both sides up to max (28°) it doesnt seem to get that hot... now it wasnt uncomfortably cold in the car (3° external), but TBH i'd expect the air coming out the vents to feel warm/hot.
anything it could be?

ta

David B
Register of the 524 RHD 3.6 E34 M5's made - http://autos.groups.yahoo.com/group/E34M5RHD-register/
Register of the 70 540iLE's made - http://autos.groups.yahoo.com/group/BMW540iLE/
M540i LE is offline  
post #3 of 9 Old 3rd November 2006, 10:22 AM Thread Starter
hoyleyboyley
Member, Sport: Off DSC: On (>50 posts)
 
Join Date: Dec 2005
Location: blackfen, SE london
Posts: 78
Thanks: 0
Thanked 0 Times in 0 Posts
hoyleyboyley is offline  
post #4 of 9 Old 3rd November 2006, 10:39 AM
M540i LE
m5board.comoholic (>1000 posts)
 
M540i LE's Avatar
 
Join Date: Jun 2004
Location: Hobart, Tasmania, Australia
Posts: 1,748
Thanks: 10
Thanked 31 Times in 24 Posts
Above the radio - the 2 vents - there should be a wheel between them. I find that if this is on cold, it doesn't matter what temp it is set on.

David B
Register of the 524 RHD 3.6 E34 M5's made - http://autos.groups.yahoo.com/group/E34M5RHD-register/
Register of the 70 540iLE's made - http://autos.groups.yahoo.com/group/BMW540iLE/
M540i LE is offline  
post #5 of 9 Old 3rd November 2006, 10:39 AM
Wane Ramsay
Senior Member (>500)
 
Wane Ramsay's Avatar
 
Join Date: Jan 2003
Location: east london, england
Posts: 518
Thanks: 69
Thanked 24 Times in 22 Posts
In the middle of the top air vent(the one just above the computer/radio)there's a knurled wheel that controls the temp to face vents. turn it towards the red marking and that should do it.I think thats what M40i LE meant.
Wane.
Wane Ramsay is offline  
post #6 of 9 Old 3rd November 2006, 10:54 AM Thread Starter
hoyleyboyley
Member, Sport: Off DSC: On (>50 posts)
 
Join Date: Dec 2005
Location: blackfen, SE london
Posts: 78
Thanks: 0
Thanked 0 Times in 0 Posts
aah - understood. did try this, but no effect.

got this reply on another bm forum

"This would normaly be either the thermostat or, more likely and air lock, which seems to be a problem on most 5 series at some time or other.

Bleed he system by getting up to running temp and opening the bleed screw near the filler cap, taking care as it is all very hot (105c) and let the air fizz out. It may help to jack the offside front up (use the jacking point only) to raise the filler to be the highest point, so it helps the air to escape. Give her a few 3000rpm 30 sec revs and then close the bleed screw down. Check the coolant level when it's cooled right down, which can take a few hours, then you should get toasty warm "

cheers.
hoyleyboyley is offline  
post #7 of 9 Old 3rd November 2006, 11:02 AM
M540i LE
m5board.comoholic (>1000 posts)
 
M540i LE's Avatar
 
Join Date: Jun 2004
Location: Hobart, Tasmania, Australia
Posts: 1,748
Thanks: 10
Thanked 31 Times in 24 Posts
Ah well...I was hoping for your sake it was something simple. Good luck with the bleed!

David B
Register of the 524 RHD 3.6 E34 M5's made - http://autos.groups.yahoo.com/group/E34M5RHD-register/
Register of the 70 540iLE's made - http://autos.groups.yahoo.com/group/BMW540iLE/
M540i LE is offline  
post #8 of 9 Old 3rd November 2006, 05:26 PM
milesr3
Addicted Member (>300 posts)
 
Join Date: Dec 2005
Location: Suffolk, UK
Posts: 359
Thanks: 1
Thanked 1 Time in 1 Post
Quote:
Originally Posted by hoyleyboyley
Bleed he system by getting up to running temp and opening the bleed screw near the filler cap, taking care as it is all very hot (105c) and let the air fizz out.
I wouldn't do this if I were you. The valve on the coolant expansion tank near the filler cap isn't a bleed screw and doing the above will simply de-pressurise you cooling system, which isn't good.

The bleed screw is in one of the hoses connected to the heater solenoids by the bulkhead. It would be worth checking the two bleed hoses (one from radiator, one from temp sensor manifold) for flow into the coolant expansion tank by looking inside the expansion tank at fast idle with the engine cold. Replace the cap before it warms up too much - or at least remove and replace the cap when it is stone cold to allow it to repressurise when it warms up again.

You could then check the hoses into the heater control solenoids at the bulkead to see if they are warm and bleed air out of the bleed valve here if necessary. Set the heater controls to maximum.

If warm water is getting to the heater matrix, but warm air isn't coming out then it could well be electrical. You have climate control as I do and mine seems to have mind of its own sometimes, although more with the fan speed than the temperature and which vents the air comes out of. Could also be that your heater matrix is blocked, or the control solenoids have got stuck if it's been shut off (full cold) over the summer.

HTH
Richard

p.s. mine still blows cold(er) air out of the face vents regardless of whether the knurled wheel is set to red or blue. It isn't noticeable at first when the car is warming up as the 'auto' setting on the distribution blows warm air firstly to the screen and then to the feet as the car warms up, then when it has reached the desired temperature, it decides to let some air out of the face vents, which in my car always seem cold or at least colder than the other vents. I tend to close them because of this.

Last edited by milesr3; 3rd November 2006 at 05:30 PM.
milesr3 is offline  
post #9 of 9 Old 3rd November 2006, 08:14 PM
Simonal
m5board.comoholic (>1000 posts)
 
Simonal's Avatar
 
Join Date: Jan 2004
Location: United Kingdom
Posts: 1,872
Thanks: 41
Thanked 39 Times in 31 Posts
Ok one other problem could be the well known Microfilter replacement.

Although it may not sound like it the fan could be struggling to provide the full power and thus the full heat.

This was the cause of my heating failure last year after changing the filter all was well this needs to be done at least twice a year to provide the best performance.

Often this is the cause of the heating failure and since this is a reletavely easy fix that can be carried out at home there are instructions on the board try searching for "microfilter"

Hope this helps.

PS as for the central tempreture wheel in the centre air vent I find this works independantly so you can adjust the tempreture regardless of the heating controls so in summer you can provide warmer air to head even with the A/c on and the tempreture on cool.
Simonal is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW M5 Forum and M6 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
Can Nitromethane be used for our cars. Read on...... FAST 5 E39 M5 and E52 Z8 Discussion 21 25th September 2006 06:10 AM
Restrictive stock air intakes stu-e-boy E39 M5 and E52 Z8 Discussion 18 13th November 2005 02:39 AM
BMW M6 Press Release no 5: Body, Design, Equipment: Light and Safe, Sporting and... Gustav E63 BMW M6 Forum and BMW M6 Convertible | m6board.com 9 15th December 2004 09:25 PM
I NEED SOME HELP WITH AIR INTAKE SYSTEM Thunderbird E39 M5 and E52 Z8 Discussion 6 14th May 2004 11:42 PM
Some air filter info from BMWE34.net BKH E39 M5 and E52 Z8 Discussion 1 30th October 2003 07:39 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome