AAN Coolant Temperature Sender Info - AudiWorld Forums

Go Back  AudiWorld Forums > Audi Models > Audi Original "S" Cars
Reload this Page > AAN Coolant Temperature Sender Info
Notices
Audi Original "S" Cars Discussion forum for the Audi Audi Ur S4, Ur S6, S2 & RS2

AAN Coolant Temperature Sender Info

Reply

 
 
Old 03-13-2011, 10:08 AM
  #1
AudiWorld Super User
Thread Starter
 
UrS4boy's Avatar
 
Join Date: Feb 2001
Posts: 18,792
Default AAN Coolant Temperature Sender Info

This applies mostly to the C4 UrS4/S6 AAN but likely crosses over to the ABY and ADU. There are four coolant temperature senders of interest, each with its own unique purpose and function (be sure to follow the hyperlinks):

1. The ECU gets its coolant temperature signal from the G62 sender at the back of the head.

2. The Automatic Climate control gets its temperature signal from a separate sender located in a "T" at the back of the head. This temperature signal can be read through Channel 51 of the automatic climate control faceplate.

3. The multifunction temperature switch (MFTS) that sends the temp signal to the gauge cluster. This reading can be compared to the Ch. 51 reading to help diagnose whether you have a MFTS problem or a thermostat problem.
Note: this MFTS switch is supposed to have a rubber boot ("grommet") over the connector (Item 29 below) and exposed switch portion, as shown as Item 27 in the diagram below.

4. The after-run pump climate control switch - this is one that triggers the after run pump.

Last edited by UrS4boy; 07-13-2011 at 10:56 PM.
UrS4boy is offline  
Reply With Quote
Old 01-04-2018, 01:22 PM
  #2
AudiWorld Newcomer
 
Join Date: Oct 2015
Posts: 3
Default

thanks for the info. my UrS6 comes up to temp fine in cool and warm weather, but wont come up to temp in freezing temps or stay there on long drives/long downhills in warmer weather. a new thermostat and MFTS are in the mail, but is there anything else i should be replacing which could be causing this, would rather not have to run codes and such.
Bulletcar95 is offline  
Reply With Quote
Old 01-06-2018, 07:58 AM
  #3
AudiWorld Super User
Thread Starter
 
UrS4boy's Avatar
 
Join Date: Feb 2001
Posts: 18,792
Default

Your thermostat might be broken and stuck open, causing the results that you are seeing.
UrS4boy is offline  
Reply With Quote
 
 
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
iowaan
A6 / S6 (C5 Platform) Discussion
18
12-30-2017 08:56 AM
Avdwaal1
A8 / S8 (D3 Platform) Discussion
36
02-17-2016 06:33 PM
sszyma
Q5/SQ5 MKI (8R) Discussion
19
09-14-2015 12:36 PM
9552T500
Audi 90 / 80 / Coupe quattro / Cabriolet
3
09-08-2015 06:41 AM
ECS Tuning-Audi
A4 (B7 Platform) Discussion
0
09-01-2015 10:16 AM


Thread Tools
Search 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 02:14 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: