Hello
I have a 94 850 with air. The a/c blows cold until the compressor gets too hot. This trips the 'temp sensor' and lets the clutch out.
I have checked for R134a and there is plenty of gas in.
I know that the clutch might need adjustment. What is the minimum opening?
Thank you, Mark.
A/c Compressor.
Started by
Guest_Guest_MARK_*_*
, Feb 18 2005 02:33 PM
9 replies to this topic
#2
jda2000
-
- Members
-
- 1,027 posts
Level 3 Member
Posted 18 February 2005 - 02:50 PM
I believe min gap is .3 mm, max .7 mm
A gap greater than .7 will cause overheating of the compressor and shut the AC off until it cools down.
Do a search on this site, there was a post a couple of weeks ago how to adjust the gap by removing one or two washers from the compressor clucth mechanism, without disconnecting the AC.
A gap greater than .7 will cause overheating of the compressor and shut the AC off until it cools down.
Do a search on this site, there was a post a couple of weeks ago how to adjust the gap by removing one or two washers from the compressor clucth mechanism, without disconnecting the AC.
John, Sarasota, FL
'01 V70 T5, '07 S60 2.5T
'01 V70 T5, '07 S60 2.5T
#3
kenhoeve
-
- Supporting Member
-
- 2,617 posts
Level 3 Member
Posted 18 February 2005 - 04:10 PM
the temp sensor is located in the brass fitting on the non-belt side of the compressor. it has one black and one white wire. simply cut each line and tie them together to keep the loop closed.
there is no safety problem, later models deleted this sensor entirely.
there is no safety problem, later models deleted this sensor entirely.
2007 V70R
FMIC|iPd stage I|iPd sways|iPd endlinks|CAI|QBM|SSR GT-10|IMiV|Alpine|Rockford|Patchouli
Best wagon ever if the damn airbox would stop vibrating and it didn't have a Ford Escort headliner.
FMIC|iPd stage I|iPd sways|iPd endlinks|CAI|QBM|SSR GT-10|IMiV|Alpine|Rockford|Patchouli
Best wagon ever if the damn airbox would stop vibrating and it didn't have a Ford Escort headliner.
#4
jda2000
-
- Members
-
- 1,027 posts
Level 3 Member
Posted 18 February 2005 - 06:42 PM
bypassing the temp sensor MIGHT lead to premature failure of the compressor.
Remember the temp sensor was placed there for a reason, to protect the compressor from overheating and failure.
If you are handy with tools, I would try the approach of removing the washers from the clutch mechanism to shorten the gap.
ANYWAYS, proceed at your own risk...
Remember the temp sensor was placed there for a reason, to protect the compressor from overheating and failure.
If you are handy with tools, I would try the approach of removing the washers from the clutch mechanism to shorten the gap.
ANYWAYS, proceed at your own risk...
John, Sarasota, FL
'01 V70 T5, '07 S60 2.5T
'01 V70 T5, '07 S60 2.5T
#5
icelandic
-
- Members
-
- 245 posts
Level 1 Member
Posted 18 February 2005 - 06:55 PM
Mark,
I just had my 94 NA850 fixed for the same problem. I know that overriding the temp sensor might cure the problem, but the sensor is there for a reason ( for instance to detect overheating caused by a failing bearing that would lead to a compressor lock up that would cause by its turn a catastrofic belt failure and engine overheat)
So common sense told me to leave it alone, and I went to the clutch adjustment that solved the problem once and for all.
See this link at volvoclub.UK:
http://www.volvoclub.org.uk/dc/dcboard.php...id=&page=#13053
Good Luck!
Luis
I just had my 94 NA850 fixed for the same problem. I know that overriding the temp sensor might cure the problem, but the sensor is there for a reason ( for instance to detect overheating caused by a failing bearing that would lead to a compressor lock up that would cause by its turn a catastrofic belt failure and engine overheat)
So common sense told me to leave it alone, and I went to the clutch adjustment that solved the problem once and for all.
See this link at volvoclub.UK:
http://www.volvoclub.org.uk/dc/dcboard.php...id=&page=#13053
Good Luck!
Luis
1994 NA 850
Sao Paulo
Brazil
Soth America
Sao Paulo
Brazil
Soth America
#6 Guest_Guest_MARK_*_*
Guest_Guest_MARK_*_*
-
- Guests
Posted 18 February 2005 - 09:32 PM
Hello again.
I can definately get .7 maybe .75mm off my 'feeler guage' between the clutch and compressor. So I guess I definately need to drop it down to pull the clutch.
Does anyone have a diagram of a clutch puller - homemade or otherwise?
Thanks
Mark
I can definately get .7 maybe .75mm off my 'feeler guage' between the clutch and compressor. So I guess I definately need to drop it down to pull the clutch.
Does anyone have a diagram of a clutch puller - homemade or otherwise?
Thanks
Mark
#7 Guest_Guest_MARK_*_*
Guest_Guest_MARK_*_*
-
- Guests
Posted 18 February 2005 - 09:37 PM
QUOTE(kenhoeve @ Feb 18 2005, 04:10 PM)
the temp sensor is located in the brass fitting on the non-belt side of the compressor. it has one black and one white wire. simply cut each line and tie them together to keep the loop closed.
there is no safety problem, later models deleted this sensor entirely.
there is no safety problem, later models deleted this sensor entirely.
Thanks, I am tempted to bypass the temp sensor BUT
If the temp sensor is removed (bypassed) and the clutch is out of tolerance then surely it would eventually burn out the compressor? So perhaps I should adjust the clutch shims
Have you had any such effects since bypassing the temp sensor?
Mark
#8
KLS
-
- Members
-
- 727 posts
Level 2 Member
Posted 18 February 2005 - 11:05 PM
Mark,
Is the sensor you're looking at an emergency shut-down sensor? What is the device that should shut down (depower the clutch) in normal operation?...a temperature sensor in the evaportator (cooling coil)? Could that be the problem? The fact that the clutch disengages at all suggests that the clutch is not the problem.
Ken
Is the sensor you're looking at an emergency shut-down sensor? What is the device that should shut down (depower the clutch) in normal operation?...a temperature sensor in the evaportator (cooling coil)? Could that be the problem? The fact that the clutch disengages at all suggests that the clutch is not the problem.
Ken
#9
MrWinkey
-
- OH Moderator
-
- 4,759 posts
Am I drunk? You tell me!
Posted 18 February 2005 - 11:54 PM
Don't forget there are pressure switches as well...maybe your over charged or undercharged
"SMOKE TROUT NOT CRACK"
#10
kenhoeve
-
- Supporting Member
-
- 2,617 posts
Level 3 Member
Posted 19 February 2005 - 02:00 AM
I have had zero negative affects 1 year after doing this. I should qualify this by saying that the reason I did so was because outdoor temps above 90*F were causing the sensor to trip, so it was not the clutch.
2007 V70R
FMIC|iPd stage I|iPd sways|iPd endlinks|CAI|QBM|SSR GT-10|IMiV|Alpine|Rockford|Patchouli
Best wagon ever if the damn airbox would stop vibrating and it didn't have a Ford Escort headliner.
FMIC|iPd stage I|iPd sways|iPd endlinks|CAI|QBM|SSR GT-10|IMiV|Alpine|Rockford|Patchouli
Best wagon ever if the damn airbox would stop vibrating and it didn't have a Ford Escort headliner.
