Air handler duct assembly diagram

Tiny
ENGINEERINGDAD
  • MEMBER
  • 1999 JAGUAR VANDEN PLAS
  • 4.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 102,000 MILES
My wife's Jaguar XJ8 Vanden Plas blower motor sounds perfectly fine with plenty of force (cfm's) from sound but the dash vents produce little air discharge. I am assuming that when we purchased the car there might be an issue we were not aware of, like possibly a dirty or clogged EVAP coil or blockage in the ducts. Do you have a diagram of the air handler duct assembly for this year? If so, then I can further diagnose the issues. Air temperature differentials are fine in readings but what should my suction line pressure be? Note: I have all the AC equipment, gauges, vacuum pump recovery unit, etc.
Wednesday, September 5th, 2018 AT 4:23 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,068 POSTS
Hi and thanks for using 2CarPros. Com.

The only diagrams I was able to locate related to the system was for removal of the evaporator. It includes pictures of the box/vents. I will attach the directions so you can identify different parts. All attached pictures correlate with these directions.
___________________

Vaporator

Removal
1. Remove heater/cooler unit;
2. Remove air conditioning control module from heater/cooler unit.
- Slacken upper fixing.
- Remove lower fixings.
3. Remove evaporator pipe firewall seal plate.
- Remove screws.
- Remove plate.
4. Disconnect heater matrix temperature sensor.
- Detach beater matrix temperature sensor connector from unit.
- Disconnect connector.
5. Remove footwell servo motor from heater/cooler unit.
- Disconnect connector.
- Remove screws.
- Remove motor complete with bracket.
6. Disconnect evaporator sensor connector
- Detach heater/ cooler unit connector.
- Detach evaporator sensor connector.
- Disconnect connector.
7. Remove heater/cooler unit upper case from lower case.
- Remove screw.
- Remove 15 clips.
- Remove upper case from lower case.
8. Remove evaporator from case.
- Remove sensor and clip.
- Remove evaporator.

Installation
1. Installation is the reverse of removal
_______________________________

Let me know if this helps.

Joe
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Thursday, September 6th, 2018 AT 6:46 PM
Tiny
ENGINEERINGDAD
  • MEMBER
  • 35 POSTS
Thanks Joe, It was actually a missing relay under the fuse/relay panel rear passenger side. I noticed it missing during a random testing of all fused circuits. Installed a spare of equivalent that I retrieved from (jaguar xj8) the salvage yards. It's operating 100%.
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Tuesday, February 12th, 2019 AT 10:04 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,068 POSTS
Welcome back:

That's what I like to hear. It's fixed. LOL I'm glad it was a relay (not sure why it was taken out). I never would have thought to tell you to check if it was there, assuming it was. Regardless, I'm glad it's fixed. I was worried about taking everything else apart. You would have been calling me all kinds of names because it isn't an easy job.

Take care of yourself and let us know if you have questions in the future.

Joe
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Tuesday, February 12th, 2019 AT 6:36 PM

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