E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 07-26-2014, 12:42 PM   #1
Parit Ghojal
Registered User
 
Join Date: Mar 2014
Location: UAE
Posts: 35
My Ride: 328i
Outside temperature sensor and A/C

Hey guys!

I'm having a problem with my outside temperature sensor. It seem - but I'm not sure yet - that every time I turn my A/C on the reading of the outside temperature drops to -25 degrees Celsius. Then when I turn it off, the reading starts to climb slowly to the real temperature. When I turn it on again, the reading drops. Is this just a coincidence or not?

Also, sometimes when I start the car, the reading of the outside temperature is already -25 degrees Celsius. So I don't know if the sensor is broken, or wires are bad or even if the A/C is somehow affecting the sensor. Could this be possible?

I need help ASAP. The compressor turns off when the reading drops to -25. It's hot out there.

Thanks in advance.
__________________
The magic of a BMW is always found in its chassis, embellished by its engine.
Parit Ghojal is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 07-26-2014, 01:38 PM   #2
jfoj
Registered User
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 9,644
My Ride: '06 330CiC, '03 M5
Quote:
Originally Posted by Parit Ghojal View Post
Hey guys!

I'm having a problem with my outside temperature sensor. It seem - but I'm not sure yet - that every time I turn my A/C on the reading of the outside temperature drops to -25 degrees Celsius. Then when I turn it off, the reading starts to climb slowly to the real temperature. When I turn it on again, the reading drops. Is this just a coincidence or not?

Also, sometimes when I start the car, the reading of the outside temperature is already -25 degrees Celsius. So I don't know if the sensor is broken, or wires are bad or even if the A/C is somehow affecting the sensor. Could this be possible?

I need help ASAP. The compressor turns off when the reading drops to -25. It's hot out there.

Thanks in advance.
Check the connections to the temp sensor under the front bumper.

If you cannot sort it out, I think you can just remove the sensor the the short term and put a jumper on the connector. This should force the reading to like 122F?
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
jfoj is offline   Reply With Quote
Old 07-26-2014, 01:54 PM   #3
Dirtybrd
Registered User
 
Join Date: May 2011
Location: Lakeland FL
Posts: 109
My Ride: 02 330ci
Just being unplugged should do that. Mine missing due to the previous owner, mine reads 122 all the time. Looking for a good used left inner lower with sensor and hardware
Dirtybrd is offline   Reply With Quote
Old 07-26-2014, 08:27 PM   #4
Parit Ghojal
Registered User
 
Join Date: Mar 2014
Location: UAE
Posts: 35
My Ride: 328i
Quote:
Originally Posted by jfoj View Post
Check the connections to the temp sensor under the front bumper.

If you cannot sort it out, I think you can just remove the sensor the the short term and put a jumper on the connector. This should force the reading to like 122F?
How to remove the sensor? Do I have to take out the wheel arch lining or the splash guard?
__________________
The magic of a BMW is always found in its chassis, embellished by its engine.
Parit Ghojal is offline   Reply With Quote
Old 07-26-2014, 08:28 PM   #5
Parit Ghojal
Registered User
 
Join Date: Mar 2014
Location: UAE
Posts: 35
My Ride: 328i
Quote:
Originally Posted by Dirtybrd View Post
Just being unplugged should do that. Mine missing due to the previous owner, mine reads 122 all the time. Looking for a good used left inner lower with sensor and hardware
I don't want to fool the A/C and force it to run at its maximum.
Also, what's the relation between turning on the A/C and the reading dropping?
__________________
The magic of a BMW is always found in its chassis, embellished by its engine.

Last edited by Parit Ghojal; 07-26-2014 at 08:29 PM.
Parit Ghojal is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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
Censor is ON





All times are GMT -5. The time now is 01:07 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use