Xjs recirculation knob
#1
Xjs recirculation knob
Hello everyone
I just have to say thank you to everyone. Your help has been much appreciated. Here's another little issue ( I hope it is )
My ac system. I have the delenair 3 system. My recirculation knob when pulled out does not engage the flaps at all. It seems as if the button is dead. It does however working when I change the temperature settings. Everything else seems to work ok. Defroster works correctly heater works fine, AC works good but not cold enough. My guess is that the recirculation flaps are not closing causing fresh air to enter the cabin. If I wedge a screwdriver into both bottom flaps the air cools perfectly. So the big question is How do I get that button working aside from keeping the screwdriver in there. Is there a fuse for just the recirculation flaps? This is driving me crazy.
Thank you.
Evan
89 Xjs convertible
I just have to say thank you to everyone. Your help has been much appreciated. Here's another little issue ( I hope it is )
My ac system. I have the delenair 3 system. My recirculation knob when pulled out does not engage the flaps at all. It seems as if the button is dead. It does however working when I change the temperature settings. Everything else seems to work ok. Defroster works correctly heater works fine, AC works good but not cold enough. My guess is that the recirculation flaps are not closing causing fresh air to enter the cabin. If I wedge a screwdriver into both bottom flaps the air cools perfectly. So the big question is How do I get that button working aside from keeping the screwdriver in there. Is there a fuse for just the recirculation flaps? This is driving me crazy.
Thank you.
Evan
89 Xjs convertible
#2
Join Date: Mar 2008
Location: Pacific Northwest USA
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to clarify a bit....
There is no *driver controlled* recirculation function or knob.
Pulling the temp control knob outward will provide manual control of temperature but does not specifically or exclusively control the recirculation flaps. Of course, if you dial-in the max cold setting the recirculation flaps should close.
So, I guess your recirc flaps are NOT closing under any circumstances, yes?
Cheers
DD
There is no *driver controlled* recirculation function or knob.
Pulling the temp control knob outward will provide manual control of temperature but does not specifically or exclusively control the recirculation flaps. Of course, if you dial-in the max cold setting the recirculation flaps should close.
So, I guess your recirc flaps are NOT closing under any circumstances, yes?
Cheers
DD
#3
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The recirc flaps are held closed by vacuum and open without vacuum.
So, it sounds like there is no application of vacuum to close your recirc flaps.
On/off vacuum supply comes from a solenoid on the left side of the climate control case, down low. Look for the *blue* vacuum line. The solenoid is electrically controlled by the climate control ECU. It will have a red/blue wire and a green wire.
I guess the easiest place to start to be checking if the solenoid is connected and and the vacuum hose attached.
You could pull the blue vacuum hose and apply vacuum with a hand pump to see if the recirc flaps close.
Assuming they do, I reckon....
A) The solenoid is not being commanded by the ECU or
B) The solenoid is faulty or
C) There is no vacuum supply to the solenoid
Near as I can tell, when max cold is asked for the ECU should provide 12v to the solenoid on the red/blue wire (most of the system components work on 5v, by the way). The solenoid then allows vacuum to the recirc door actuators, closing them.
Hope this is enough to be helpful and/or get you headed in the right direction.
Cheers
DD
So, it sounds like there is no application of vacuum to close your recirc flaps.
On/off vacuum supply comes from a solenoid on the left side of the climate control case, down low. Look for the *blue* vacuum line. The solenoid is electrically controlled by the climate control ECU. It will have a red/blue wire and a green wire.
I guess the easiest place to start to be checking if the solenoid is connected and and the vacuum hose attached.
You could pull the blue vacuum hose and apply vacuum with a hand pump to see if the recirc flaps close.
Assuming they do, I reckon....
A) The solenoid is not being commanded by the ECU or
B) The solenoid is faulty or
C) There is no vacuum supply to the solenoid
Near as I can tell, when max cold is asked for the ECU should provide 12v to the solenoid on the red/blue wire (most of the system components work on 5v, by the way). The solenoid then allows vacuum to the recirc door actuators, closing them.
Hope this is enough to be helpful and/or get you headed in the right direction.
Cheers
DD
#11
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Location: Pacific Northwest USA
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I don't have in an e-format. But here's a couple of many sources
Jaguar #42 Delanair Mk 3 Air conditioning unit manual, Language: English, Category: Owners manuals
Collection Car
Cheers
DD
Jaguar #42 Delanair Mk 3 Air conditioning unit manual, Language: English, Category: Owners manuals
Collection Car
Cheers
DD
#12
Is there a relay inside the blower housing that could've failed or is it just run on vacuum? Everything checked out fine. The solenoid is providing vacuum to the blue line. I even unplugged both lines going to the blower house diaphragm and there is vacuum going to them. Could it be a faulty vacuum diaphragm? Would it effect both housings? Another problem is that when I have a/c on full cool the is no vacuum going to the heater valve. Can't seem to find where that small black hose connects to comming from the heater valve. I follow it thru the firewall both cant seem to find it on the other side. Does is change colors inside the cabin. I'm suspecting the line may be disconnected.
#13
Another problem is that when I have a/c on full cool the is no vacuum going to the heater valve. Can't seem to find where that small black hose connects to comming from the heater valve. I follow it thru the firewall both cant seem to find it on the other side. Does is change colors inside the cabin. I'm suspecting the line may be disconnected.
If you look at the panel (which might involve you removing the windscreen washer reservoir first, depending on your model) you will see that TWO vac lines go through it. One comes from the vac source on the inlet, and another comes out from the heater unit and back to the heater valve. One of the lines, I think the vac source one, has a non-return valve in the line, which may well be jammed, and causing problems.
Worth checking the vac reservoir is holding vac, they very rarely go wrong, in fact nobody knows they are there!
Greg
#14
There is either in jag-lovers (an old thread) or possibly in "the BOOK" ) a fix for this where in effect you wire in an extra relay and find a suitable place for an extra switch to control the flaps at will. If you cannot find it it will consist of a relay which when de-energised allows the original system control the vacuum solenoid for the flaps, but when activated cuts the connection to the system and applies 12V directly to the vacuum solenoid for the flaps. Just do make sure you do not feed 12V to the system ECU instead
Last edited by Per; 10-06-2012 at 03:09 PM.
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