318ti.org forum

Go Back   318ti.org forum > Technical, Maintenance and Modifications > HVAC


HVAC Heating, ventilation and air conditioning.

» Recent Threads
wtb 4.45 lsd
Yesterday 11:37 PM
Last post by joek84
Yesterday 11:37 PM
0 Replies, 73 Views
Midnight Tuning...
02-08-2012 05:38 PM
Last post by E3X318is
Yesterday 07:19 PM
195 Replies, 92,627 Views
Fuel pump keeps running...
08-06-2020 05:33 PM
Last post by Texas98ti
Yesterday 06:25 PM
6 Replies, 381 Views
new engine build. dasc +...
01-02-2016 01:28 AM
Last post by andakn
Yesterday 04:07 PM
209 Replies, 120,405 Views
318ti Is closing down??
07-31-2019 11:26 PM
Last post by BlackBMWs
Yesterday 08:18 AM
51 Replies, 72,358 Views
Torque wrench...
07-28-2020 08:01 PM
Last post by J!m
Yesterday 04:36 AM
5 Replies, 718 Views
96 M-Sport Slick-Top
08-05-2020 07:34 PM
Last post by BRADESTAR
Yesterday 04:12 AM
5 Replies, 393 Views
318ti parts
06-09-2020 12:00 AM
Last post by dudecati
08-06-2020 08:58 PM
18 Replies, 4,026 Views
Can I bleed the brakes...
08-05-2020 02:56 AM
Last post by Mad A
08-05-2020 02:27 PM
2 Replies, 273 Views
reinforcement plates
04-13-2012 03:54 PM
Last post by BimmerBum
08-05-2020 03:45 AM
17 Replies, 3,593 Views
Reply Share/Bookmark
Thread Tools Display Modes
Old 07-13-2020, 01:13 AM   #1
Junior Member
Join Date: Feb 2015
Location: Albuquerque, NM
Posts: 6
iTrader: (0)
Default Troubleshooting AC - Compressor works, low side pressure good

Hi all,

Well, after driving 2 hours in 106 degree weather yesterday, my wife has finally convinced me to tackle fixing the AC in my 1998 318ti.

I first checked the compressor and the clutch was not engaging. Long story, short, the system was empty and therefore the pressure switch (I think in the dryer) was not allowing the AC relay (#14 in the fuse box) to activate the clutch.

FYI - when working the relay closes to allow a 12 V DC signal to pass through fuse 39 and engage the electromagnetic clutch on the compressor. I trouble shot this by jumping the relay to show the clutch worked, and then refilling the system, and putting the relay back in place.

The clutch now engages when I hit the AC button inside and I have 35 PSI on the low side when the AC is compressor is running. But I still have hot air at the vents.....

I've hit the limit of my Bentley manual which mostly covers the non-ti HCAV systems.

Any thoughts why? Is there some flap that needs to be opened to allow air to come in from over the evaporator? I have fixed the boden cable that controls the heat flap, but is there something else that I'm missing for the AC? I see there is an "AC control module" listed in realoem. (#3 in attached image). Anyone know what this does?

Any thoughts or help appreciated. Thanks!!
Attached Thumbnails
Click image for larger version Name:	Screen Shot 2020-07-12 at 6.06.50 PM.jpg Views:	15 Size:	46.5 KB ID:	17898  
Boston_Green_m42ti is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Misc parts CenCoast CA: Trade Interior Parts for Good Beer Strawman Parting out & Parts (US) 12 09-04-2017 04:24 PM
WTB - Ti low miles good condition not a project Scoot US and North America 0 04-24-2012 07:34 PM
PA Three Style 22 (DS1) Wheels - 2 Good, 1 not so good zboot US and North America 2 10-05-2010 05:09 PM
SAP (Secondary Air Pump) Repairs cali-ti Knowledge Base 5 01-23-2010 10:10 PM
Good parts, Low Price, Garik Garuntee M3_KILL3R US and North America 1 07-29-2008 03:50 AM

All times are GMT +1. The time now is 09:10 AM.

Powered by site supporters
vBulletin Version 3.8.8
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright ©1999 - 2020, 318ti.org
© vBadvanced CMPS v3.2.2
[page compression: 66.02 k/75.52 k (12.57%)]

318ti.org does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information or products discussed.