S-Type / S type R Supercharged V8 ( X200 ) 1999 - 2008 2001 - 2009
Sponsored by:
Sponsored by:

The Ghost of A/C past (PLEASE HELP)

 
  #1  
Old 08-12-2018, 05:26 PM
Senior Member
Thread Starter
Join Date: Sep 2012
Location: Atlanta
Posts: 169
Liked 3 Times in 3 Posts
Default The Ghost of A/C past (PLEASE HELP)

Ok I got my 2001 S-Type. About 4 years ago I changed the A/C compressor and Dryer at a a friends shop using aftermarket parts and the air started working OK. After it going in and out I decided to take it to a reputable A/C shop this summer and they told me that the compressor was bad and had to be changed. They changed it and it blew cold air like it was winter time in Minnesota.

Fast Forward 2 months (maybe 3) and I thought I felt the air warm sometimes but it would always get cold again. Then 2 days ago I'm driving down the street and I notice the car overheating. No smoke I just got the warning lights and noticed the gauge. I turned off the A/C and it immediately went back to normal. 10 minutes later I turn the A/C back on and everything is working just fine until today the air is NOT cool at all.

I can obviously take it back to the A/C place as its under warranty but since its sunday and its closed I thought I would check to see if anybody in the forums had any thoughts.

Thanks
 
  #2  
Old 08-12-2018, 07:00 PM
Veteran Member
Join Date: Oct 2012
Location: Oregon
Posts: 1,788
Liked 624 Times in 481 Posts
Default

Originally Posted by mikchek View Post
I thought I felt the air warm sometimes but it would always get cold again.
I keep one of these inexpensive thermometers in the center vent. It really helps keep an eye on the actual temperature, versus what I think the AC might be doing at any particular moment:






Originally Posted by mikchek View Post
Then 2 days ago I'm driving down the street and I notice the car overheating. No smoke I just got the warning lights and noticed the gauge. I turned off the A/C and it immediately went back to normal.
For the moment, I'd suggest putting the AC on the back burner. Figure out exactly why the engine got hot and correct that. It may be related to the AC issue, but who knows.

Lack of AC = Nuisance, still driveable
Engine melted down = Expensive paperweight

I'd highly suggest running a pressure test on the cooling system. Also, make sure the radiator cooling fan is running properly. How fast were you going when the temp shot up? If below 30mph, the radiator fan may be the culprit. Above 30mph or so, you will generally have adequate ram airflow through the radiator.


Originally Posted by mikchek View Post
10 minutes later I turn the A/C back on and everything is working just fine until today the air is NOT cool at all.
Once you get the overheat diagnosed and corrected, look through this Proust-like masterpiece:

https://www.jaguarforums.com/forum/s...ol-how-185002/


For all we know, the current fault may be totally unrelated to any of the previous work. You can do a LOT of the steps in that guide with nothing more than a cheap pocket thermometer. For even better results, beg, borrow, or steal an infrared thermometer for checking the temperature of the coolant lines to the heater. In the guide, please start by first doing the steps in post #2, which makes sure the DCCV is operating properly. After that, use a thermometer in the dash to determine if you're getting some cooling (duct temp lower than ambient, even if not fully cold), or no cooling (duct temp equal to ambient). Also try playing around with the system in manual mode, which bypasses some automatic functions and is a boon for troubleshooting. Don't convince yourself the problem is related to past work. Go in with an open mind and troubleshoot based on the present symptoms.

One thought that could account for the overheating AND erratic AC is crud in the cooling system. Debris may be blocking the radiator's internal passages and also jamming the DCCV open. The test of the DCCV in my troubleshooting guide will quickly rule out a problem affecting the DCCV. It's not a test of the cooling system itself, but it could help narrow down some possibilities.
 
The following users liked this post: kr98664
mikchek (08-13-2018)
  #3  
Old 08-13-2018, 08:45 AM
Senior Member
Thread Starter
Join Date: Sep 2012
Location: Atlanta
Posts: 169
Liked 3 Times in 3 Posts
Default

Originally Posted by kr98664 View Post
I keep one of these inexpensive thermometers in the center vent. It really helps keep an eye on the actual temperature, versus what I think the AC might be doing at any particular moment:








For the moment, I'd suggest putting the AC on the back burner. Figure out exactly why the engine got hot and correct that. It may be related to the AC issue, but who knows.

Lack of AC = Nuisance, still driveable
Engine melted down = Expensive paperweight

I'd highly suggest running a pressure test on the cooling system. Also, make sure the radiator cooling fan is running properly. How fast were you going when the temp shot up? If below 30mph, the radiator fan may be the culprit. Above 30mph or so, you will generally have adequate ram airflow through the radiator.




Once you get the overheat diagnosed and corrected, look through this Proust-like masterpiece:

https://www.jaguarforums.com/forum/s...ol-how-185002/


For all we know, the current fault may be totally unrelated to any of the previous work. You can do a LOT of the steps in that guide with nothing more than a cheap pocket thermometer. For even better results, beg, borrow, or steal an infrared thermometer for checking the temperature of the coolant lines to the heater. In the guide, please start by first doing the steps in post #2, which makes sure the DCCV is operating properly. After that, use a thermometer in the dash to determine if you're getting some cooling (duct temp lower than ambient, even if not fully cold), or no cooling (duct temp equal to ambient). Also try playing around with the system in manual mode, which bypasses some automatic functions and is a boon for troubleshooting. Don't convince yourself the problem is related to past work. Go in with an open mind and troubleshoot based on the present symptoms.

One thought that could account for the overheating AND erratic AC is crud in the cooling system. Debris may be blocking the radiator's internal passages and also jamming the DCCV open. The test of the DCCV in my troubleshooting guide will quickly rule out a problem affecting the DCCV. It's not a test of the cooling system itself, but it could help narrow down some possibilities.
Thank for the insight Karl.

I was only going about 30mph and had only been on the road 5mins. I'm gonna stop back by the A/C shop this morning before I look into it myself.
 
  #4  
Old 08-13-2018, 10:47 AM
Senior Member
Thread Starter
Join Date: Sep 2012
Location: Atlanta
Posts: 169
Liked 3 Times in 3 Posts
Default

Just got confirmation that the A/C is fine! Its also blowing cool right now so well see what happens
 
  #5  
Old 08-13-2018, 10:57 AM
Veteran Member
Join Date: Oct 2012
Location: Oregon
Posts: 1,788
Liked 624 Times in 481 Posts
Default

Originally Posted by mikchek View Post
Just got confirmation that the A/C is fine! Its also blowing cool right now so well see what happens
Do you have the V6? The early V6 models have a special failsafe cooling mode. If the engine coolant temperature rises above a certain threshold, some protective features kick in automatically, including turning off the AC.

If you have the V6, the apparent AC problem may have been a normal response to the engine overheating. Sorry I forgot to mention that yesterday.
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Lothar52
XK / XKR ( X150 )
9
08-21-2018 07:49 PM
lizzardo
F-Type ( X152 )
17
12-18-2017 12:27 AM
allenward
S-Type / S type R Supercharged V8 ( X200 )
13
11-02-2016 12:43 PM
reb1999
XK8 / XKR ( X100 )
13
11-08-2014 07:55 PM
flyrr100
X-Type ( X400 )
11
12-16-2012 02:17 PM

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

Thread Tools
Search this Thread
Quick Reply: The Ghost of A/C past (PLEASE HELP)


Advertising
Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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: