Jaguar XJ40 GUIDE to: Replacing the Heater Controls

JSeaman

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The heater control panel is in the centre console of the car. This guide will show you how to remove and replace the fan controls but is also useful if you need access to the stereo etc at any point

Step 1 - Open the centre console storage box lid

HCStep1.jpg


Step 2 - Remove the two Philips screws on the outer edge

HCStep2.jpg


Step 3 - Ensure the ashtray is in the closed position

HCStep3.jpg
 

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Re: GUIDE : Replacing the heater controls

Step 4 - Lift the ash tray unit out and tip it forwards towards the dash, be careful not to pull on the wiring

HCStep4.jpg


Step 5 - Slide off the two spade clip connectors

HCStep5.jpg


Step 6 - There is a small black plastic piece of trim, this should slide out towards the rear of the car and has two tabs (you can see one by my thumb) so don't pull it upwards until you've removed it completely

HCStep6.jpg
 

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Re: GUIDE : Replacing the heater controls

Step 7- Slide the gear shifter into N or D to get some room to work in (you will obviously need to turn the ignition on and press the brake pedal for the transmission lock)

HCStep7.jpg


Step 8 - Remove the outer surround which is simply pulled up

HCStep8.jpg


Step 9 - Now to the inner black plastic surround, this is also squeezed to release the clips and then lifted up. Be careful because this is only thin plastic

HCStep9.jpg
 

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Re: GUIDE : Replacing the heater controls

Step 10 - You will find two nylon wing nuts on the underside of the wood trim, remove both of these and catch the wingnuts as they fall

HCStep10a.jpg

HCStep10b.jpg


Step 11 - Lift the trim directly upwards to allow the threaded bars to clear the holes as shown

HCStep11.jpg


Step 12 - Now slide the whole wooden piece towards the rear of the car and it should pull out with little resistance. Be careful not to tug on the wood at any point or you risk cracking the lacquer

HCStep12a.jpg

HCStep12b.jpg
 

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Re: GUIDE : Replacing the heater controls

Step 13 - There are 6 Philips screws holding the dash electronics in place, two on either side and then two at the top, remove all of them

HCStep13.jpg


Step 14 - You should now be able to slide the whole unit forwards, be careful not to damage the tabs for the screws

HCStep14a.jpg

HCStep14b.jpg


Step 15 - Depress the multiplug connector on the back of the fan control unit and remove it

HCStep15.jpg
 

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Re: GUIDE : Replacing the heater controls

Step 16 - Four screws remain (two at the top and one either side) before the control panel comes out completely. The picture shows the unit removed so you can easily see screw positions

HCStep16.jpg


Step 17 - I suggest you move to a spot where you have access to a solvent cleaner, soldering iron, good lighting etc if you are going to work on the existing panel

HCStep17.jpg


Step 18 - Slide off the two rotational controls - they simply pull forwards (the second picture shows the back of the dial, it is keyed so reassembly is easy)

HCStep18a.jpg

HCStep18b.jpg
 

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Re: GUIDE : Replacing the heater controls

Step 19 - Press the back of the plastic as shown to release the hooks holding the two parts of the fan control box together, it's a little bit fiddly but you don't need a lot of force

HCStep19a.jpg

HCStep19b.jpg

HCStep19c.jpg


Step 20 - Familiarise yourself with the layout of the boards and start to look for any signs of water ingress, damage or corrosion

HCStep20.jpg
 

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Re: GUIDE : Replacing the heater controls

Step 21 - Remove the two red board-to-board connectors which are multi pin ribbon cable

HCStep21.jpg


Step 22 - Slide the front board forward and lift it clear of the box

HCStep22a.jpg

HCStep22b.jpg


Step 23 - A single small Philips screw holds the second PCB (printed circuit board) in place, remove this

HCStep23.jpg
 

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Re: GUIDE : Replacing the heater controls

Step 24 - Pushing the sides of the box outwards, you should be able to remove the board from the box. Again, this is a little fiddly but no real force is required. Inspect and look for signs of damage

HCStep24a.jpg

HCStep24b.jpg

HCStep24c.jpg


Step 25 - Any staining such as that shown on the picture will need to be cleaned up before reassembly, this sort of corrosion can cause short circuits and unpredictable behaviour

HCStep25.jpg
 

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Re: GUIDE : Replacing the heater controls

Step 26 - Use solvent cleaner to remove any deposits and then re-touch all the solder joints

HCStep26a.jpg

HCStep26b.jpg


Step 27 - Once you have finished reworking the PCB, place it back into the enclosure

HCStep27.jpg


Step 28 - Refit the small Philips screw through the plastic surround

HCStep28.jpg
 
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