hi: i am not very good at electrical issues so bare with me as i try to explain my dilema and ask for help. i recently had full function of my climate control. i now do not have any function at my dash climate controls when i turn the right side dial to low/auto/high/defrost. nothing happens. i pulled any fuse that was related to a/c in the fuse boxes. they all appeared good. i then took the car to my ac guy and he confirmed that i had 80# in the system. he also confirmed that i had good fuses in the fuse box as well as the inline fuses on each side of the center console. what he did uncover is that i had no power at the wire that plugs into the harness leading to the compressor. if you look at the photo, i am referencing the disconnected male/female connectors resting on top of the two rubber hoses at the bottom right corner of the brown coolant overflow tank. could there be an inline fuse hidden somewhere under the coolant tank or anywhere else on its route to control unit inside the car? ren

 

maybe this photo shows better the female connector tipped red/white wire that disappears under the fender mounted fuse box. this is the wire that i was wondering: where does it go? and does it have any inline fuses that may have blown?

 

No a/c related fuses in the engine bay. Just the four in the cabin.

Not sure about the wire you've pictured; not familiar to me offhand. The compressor wiring has been altered but i can't see exactly how...and might not have anything to do with your immediate problem.

You might have a problem with the Ranco thermostat ....which kills the compressor circuit if the evaporator begins to ice-up. Possibly as simple as being disconnected. It's behind the console cheek panel, RH side

In this illustration the Ranco thermostat is part number AEU1675


Cheers
DD

 

Do you have a wiring diagram?

 

thanks doug. the ac guy checked all fuses inside the cabin and they were good. he did get the blower motors to come on and go through the low/auto/high/defrost modes successfully. i am close to taking it to a jag "specialist". my first decision is do i wait for 2 months for the local prima donna jag specialist to work on this issue or do i take the car to another european auto specialist that can evaluate it in 3/4 days? decisions upon decisions.....thanks again for your advice.

 

greg: yup, i have the official jag service manual that was written for jag service technicians with way more skill/knowledge than i have. so i kind of stare at the schematics and hope for some sort of devine intervention to reveal the corrective course of action. so far that ain't workin:}

 

hi doug, i didn't get a visual on the ranco thermostat. the jag service manual indicates that i have to remove the glove box liner? that seems weird. i'll dig into it tomorrow and let you know. i might also have a bad servo amplifier?

 

Hi,
I need to read my book again but I think the problem is inside the car. There are inline fuses hidden behind the cheek / vent panels, did you check those ? The compressor gets power from the amp / servo / ranco thermo conglomeration so the rest of the system should work = inside controls, heat, blowers, defrost vents opening etc just no cold air if the problem is with the modified under hood compressor wiring.

Let me reread my books again ( I've slept since them ! ), but I should be able to steer you in the right direction ( I removed my servo unit and found / fixed a bad solder joint inside ).

Cheers,
Brian

Too bad you're not closer, I bought a factory / dealer test box I've not had a chance to use yet !

 

Have you been to Jose's site and downloaded the Delinair Manual?

https://jagupgrades.webstarts.com/order

 

Bill and Doug, could it be the overpressure switch at the back of the compressor or the three-prong black fuse mounted to the bracket next to the compressor ?

 

To remove the Ranco it is perhaps required to removed the glove box. But I think you can see it, and check that there are no dangling wires, without removing the glove box

Select 'auto' on the dial and slowly rotate the temp knob thru its full range. You should hear a faint whirring and the and hear/feel the different air outlets opening and closing. If not, the servo isn't working. Power to the compressor is switched on-off by the servo, and the servo is commanded by the amplifier.

You might also simply check the wiring at the compressor to see if something has come undone.

The compressor and wiring is non-standard. However, the installer almost surely would have used the original power wire. Look for a green/brown wire attached to the compressor wires. That's your power wire from the cabin.

Earlier I said there were no a/c fuses in the engine bay. That's not quite true. There are no conventional fuses. But, as built, your car would have had the odd, three-prong thermal limiter fuse attached to the compressor bracket. These are typically discarded when going to a non-standard compressor....but perhaps not in your case. Take a peek. it looks like this

Cheers
DD

 

I spent one whole winter chasing why the compressor wouldn't work.
It already had a new Jag-Aire amp so I didn't even bother considering that.
However, I did change the Ranko.
And the mode switch.
And I got a rebuilt servo from Jag-Aire (that was a barrel of fun to change) and still no power to the compressor.

The only thing left was the relay that activates the clutch on the compressor.
Husband said, "It's OK because it clicks." But as it was the only thing left, I changed that too when he wasn't looking, and SCHAZZAAM!! I had cold air and lots of it.

Somewhere that at system has got to be a similar relay. You might want to check if it's actually passing power of it it's merely clicking, making a lot of noise but doing nothing.
(':')