IPD sale XeMODeX - Experts in Volvo Electronics
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

Ac Problem

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
Anaivi0713
Posts: 2
Joined: Sat May 23, 2020 12:15 pm
Year and Model: 2007 xc90 3.2 awd
Location: Puerto Rico
Has thanked: 0
Been thanked: 0
Puerto Rico
Anaivi0713

Ac Problem

Post by Anaivi0713 » Sat May 23, 2020 12:26 pm

I replace the AC compressor, the expantion valve and the drier. After all the process of refrigerant etc. It worked for a few minutes then all the lines when from really cold to hot. What should I do?? What else can it be?

User avatar
June
Posts: 1753
Joined: Wed May 04, 2016 11:18 am
Year and Model: 2004 S80 T6
Location: Jacksonville, Florida
Has thanked: 306 times
Been thanked: 151 times
United States of America
June

Re: Ac Problem

Post by June » Sat May 23, 2020 1:04 pm

Check cooling fans/ clean condenser coils. Otherwise we need to know what the high and low refrigerant pressure is running to be more helpful. You did leave it at vacuum for five minutes at least once vacuum pump was off and closed to be sure no big leaks? June
My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

Anaivi0713
Posts: 2
Joined: Sat May 23, 2020 12:15 pm
Year and Model: 2007 xc90 3.2 awd
Location: Puerto Rico
Has thanked: 0
Been thanked: 0
Puerto Rico
Anaivi0713

Re: Ac Problem

Post by Anaivi0713 » Sat May 23, 2020 1:06 pm

Vacuum was done right. Coils are clean and fans are running...

jimmy57
Posts: 6573
Joined: Fri Nov 12, 2010 9:25 am
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas
Has thanked: 4 times
Been thanked: 237 times
jimmy57

Re: Ac Problem

Post by jimmy57 » Sat May 23, 2020 1:54 pm

The compressor is variable displacement. The evaporator in the case has a temp probe that reports air temp about 1 inch from evaporator. The climate control module gets this signal and then sends a signal to engine control module to request high, medium, or low compresor functioning. The engine control module pulses a solenoid inserted into side of compressor to control the compressor. The evaporator temp probe can cause poor cooling and if that is it the evaporator temp read out from the climate module will be wrong. On a 34C day before the car is run the climate control evap temp would be 34-38C. if it reports a much cooler temp like 13C then the compressor will not be commanded to higher output and it ill not cool well when everything else is working as it should. Another failure can be the solenoid inserted into compressor sticking. In that case the evaporator temp will be reported correctly and if you read a/c control signal from the ECM it wil be 75-90% but the low side and high pressure will be 95 and 115 respectively as the compressor will barely be moving refrigerant. VIDA or a scan tool that reads Volvo modules will have to be used.
These users thanked the author jimmy57 for the post:
June

User avatar
oragex
Posts: 4808
Joined: Fri May 24, 2013 6:20 am
Year and Model: S60 2003
Location: Canada
Has thanked: 95 times
Been thanked: 265 times
Contact:
Canada
oragex

Re: Ac Problem

Post by oragex » Sun May 24, 2020 8:01 am

Not necessarily related to the issue, but I found this interesting AC troubleshooting guide https://www.buyautoparts.com/howto/ac-p ... adings.htm

Post Reply
  • Similar Topics
    Replies
    Views
    Last post