HOW TO: Heater Matrix Repair

conaero

Forum Owner
Messages
29,425
With thanks to John Emment / Maverick for his in-depth guide below:

Pictures to follow...

Heater matrix replacment

Step 1: Sseats removal

  1. Move seats forward and remove the 2 bolts

    DSC00995.jpg
  2. Move the seats as far back as you can and remove the 2 bolts

    IMG_0527.jpg
  3. Disconect the sockets under each seat 1 pasenger 2 driver
Step 2: Battery isolate

  1. Open both doors so that the windows drop . The reason for this is to allow you to open and shut the doors with out damaging the glass with the power off.
  2. Isolate the batery by turning the switch in the boot.

    IMG_0528.jpg
Step 3: Armrest consol removal

  1. Remove the rear vents by carefully pulling them out and than remove the 2 screws.

    DSC00997.jpg
  2. Remove the ashtry and disconect the conector and then the coin tray rubber matt and remove the 2 screws.

    DSC00999.jpg
  3. Pull the hand brake up and unpop the popper on the hand brake gaitor.
  4. Carefully lift up the year of the consol and unplug the nti unit and the electric mirror control connector.

    DSC01005.jpg

    DSC01003.jpg
  5. Lift the consol out being carefull to ease the hand brake though the gaitor.
Step 4: Roof side covers removal

  1. These just pull off

    DSC01007.jpg
Step 5. A pillar cover removal

  1. Remove screw and lift out

    DSC01009.jpg
Step 6: Dash top centre vent removal

  1. Remove the 2 screws and lift out.

    DSC01010.jpg
Step 7: Dash top removal

  1. Remove the 2 screws under the centre dash top vent.

    DSC01011.jpg
  2. Remove the 2 srews 1 at the top of each end.

    DSC01012.jpg
  3. Lift the dash top off and disconect the sensor.

    DSC01086.jpg
Step 8: Reverse lever panel removal

  1. Remove the 2 screws.

    DSC01013.jpg
  2. Lift out and disconect the conector.
Step 9: Lcd screen removal

  1. This just prizes out use a soft prizing tool.
  2. Disconet the connectors.

    DSC01014.jpg
Step 10: Clock

  1. Unplug the clock though the opening left by the lcd screen.
Step 11: Heater control panel removal

  1. Remove 5 screwsand lift out slightly.

    DSC01016.jpg
  2. Disconect the connectors.

    DSC01017.jpg
Step 12: Pasenger airbag removal

  1. Remove the 4 bolts from the top of the module.

    DSC01018.jpg
  2. Very carefully pull out the airbag modual towards you and remove the 3 torx screws and unplug the connector.

    DSC01019.jpg
  3. Remove and store somewhere safe (explosive)
Step 13: Glovebox light and petrol release removal

  1. This just pulls out and than disconect the connectors and push cable back though hole.

    DSC01084.jpg
Step 14: Steering wheels clams removal

  1. Remove 5 srews from underneath.

    DSC01024.jpg
  2. Remove the 2 screws from the sides 1 at 9.00 oclock and 1 at 3.00 oclock , do this by rotating the streering wheel by 90 deg both ways.

    DSC01025.jpg
Step 15: Speedometre removal

  1. Remove the 2 bolts on the steel bracket at the top.

    DSC01026.jpg
  2. Remove the 4 screws 2 on top marked with arrow and 2 underneath.

    DSC01027.jpg

    DSC01028.jpg
  3. Pull forward and disconect very cafefully all the connectors.

    DSC01032.jpg
Step 16: Steering wheel removal

  1. Remove the two torx screws on the rear of the steering wheel this will release the airbag than unplug the conector please. Handle with care.(explosive)
  2. Unplug the white conector and earth.
  3. Remove the 4 bolts holding the streering wheel on.

    DSC01052.jpg
  4. Remove streering wheel
  5. Remove the 4 screws holding the padles on.
  6. Remove the 5 screws and the centre nut.
  7. Carefully remove the copper horn ring.
  8. Using a three legged puller remove the alloy boss again be carefull and feed the wires though .
  9. Remove the black ring ,this just pulls off.

    DSC01053.jpg
  10. Disconect all the conectors at the back of the indicator assy.

    DSC01056.jpg

    DSC01057.jpg
  11. Remove the 5 screws holding the stalk on and remove.

    DSC01055.jpg
Step 17: Diagnostic port removal

  1. Remove the 2 screws holding it on. Located to the right underside or the dash drivers side.

    DSC01035.jpg
Step 18: Headlight switch and height conectors removal

  1. Disconect the connectors.

    DSC01040.jpg
Step 19: Internal temp sensor disconect

  1. Disconect the white conector though the centre consol. Sensor is located on the dash to the left of the steering wheel.

    DSC01050.jpg
Step 20: Sat nav receiver

  1. Remove the right centre dash air vent and carefully push the reciever down behind the dash to the opening in the cenrter consol.
Step 21: Airbag deactivation switch removal

  1. Prize out the switch and disconect the connector.

    DSC01085.jpg
Step 22: Dash removal

  1. Remove the 3 bolts alond the top of dash.

    DSC01044.jpg

    DSC01045.jpg

    DSC01046.jpg
  2. Remove the 2 bolts either side of the centre ventstowards the back.

    DSC01043.jpg
  3. Remove the 2 outer vents and remove the 2 screws 1 from each side.

    DSC01042.jpg
  4. Remove the 2 screws at the back of the steel box where the pasenger airbag was situated.

    DSC01047.jpg
  5. Slacken off the nuts but dont remove from down by your feet both sides lower a pillar.

    DSC01039.jpg
  6. Remove the 2 screws down by the bottom of the centre consol by the hand brake.
  7. Now its time to remove the dash, caefully remove the whole dash out of the car by pulling towards you.
  8. You car should nowlook like this weel done!

    DSC01058.jpg
Step 23: Heater matrix box removal

  1. Remove the 18 screws holding all the pipes on and remove the pipes.

    DSC01059.jpg
  2. Unlpug all these connectors.

    DSC01063.jpg

    DSC01064.jpg
  3. Remove the 2 screws on the steel bracket on the drivers side.

    DSC01060.jpg
  4. Remove the 2 screws and unplug the 2 connectors.

    DSC01065.jpg
  5. Pass the loom and conectors you have just disconected though this hole.

    DSC01066.jpg
  6. Remove 2 screws on passenger side.

    DSC01071.jpg

    DSC01072.jpg
  7. Remove these 2 srews on drivers side.

    DSC01073.jpg
  8. Remove these 2 screws at the to.

    DSC01069.jpg
  9. Its now time to drain your coolant using the drain plug situated on the near side of the radiator.
  10. Pull the matrix box towards you slightly and disconect the 2 coolant pipes , you now should be able to remove the matrix box from the car.
Step 24: changing the matrix

  1. Remove the 5 screws lift off the top of the box and remove the matrix.

    DSC01076.jpg
Congratulations you have sucsesfully changed your matrix now its time to put it all back.

Refit in reverse 24 to 1.
 

maverick

Centenary Club
Messages
1,982
Pictures have now been added thanks to matt for loading them on . Will be interesting to see if the guide works so .
 

FIFTY

Member
Messages
1,655
Thank you very much Mav, now I need to get my **** in gear and do the job

What would you prioritise, leaking cam covers or heater matrix (which is diverted so not leaking currently)? lol :)
 

mjheathcote

Centenary Club
Messages
6,526
Excellent guide, I'm sure this will be referred to for many years to come.
It is a bit of a rubbish design though, you put it all back together, and you can't tell if the **** thing is okay after you have refilled her up with coolant and ran her for a while.
From my experience on other cars you can always give the jubilee clips a tighten after a few heat/cool cycles.
While it was apart, did you change the rubber coolant hoses too?
 

maverick

Centenary Club
Messages
1,982
Excellent guide, I'm sure this will be referred to for many years to come.
It is a bit of a rubbish design though, you put it all back together, and you can't tell if the **** thing is okay after you have refilled her up with coolant and ran her for a while.
From my experience on other cars you can always give the jubilee clips a tighten after a few heat/cool cycles.
While it was apart, did you change the rubber coolant hoses too?
No I didn't as there looked to be in very good condition the matrix on the other hand was shot
IMG_0498.jpg
 

maverick

Centenary Club
Messages
1,982
Thank you very much Mav, now I need to get my **** in gear and do the job

What would you prioritise, leaking cam covers or heater matrix (which is diverted so not leaking currently)? lol :)
May be you cam covers as that will make a mess of your engine bay , don't forget to do a guide with pics .
 

Masera

Junior Member
Messages
76
This is awesome and much appreciated! Planning on doing this soon. Quick question, do you guys over here have a preferred replacement part?
 

Gp79

Member
Messages
974
Great guide thanks a lot everyone who contributed.
the current state of my GS while I wait for a new matrix.
Was leaking from both hose fitting and the matrix
Cheers Greg



CFF8A7E4-9F14-4F44-AFB7-5A5438A382AA.jpeg

29AB1527-15E7-4296-A395-3A6A11C87024.jpeg
 

TimR

Member
Messages
1,011
Is mine the only car that wont remove the trans tunnel like this...? Neither here or in David Howson's How To ( Whats inside the armrest etc...) does it describe where/how/what the front fixings are..?

Grrtzzz....!
 

MaserCoupe

Member
Messages
463
Wow!!....What a great write up!! Really, really impressive stuff. You've really done a great job here and thank you for sharing this. SportsMaserati and contributors a big shout out of thanks! What a genuinely great community this is! Thank you again.
 

Gp79

Member
Messages
974
Is mine the only car that wont remove the trans tunnel like this...? Neither here or in David Howson's How To ( Whats inside the armrest etc...) does it describe where/how/what the front fixings are..?

Grrtzzz....!
The GS centre console is slightly different but there are only 3 screws, 2 rear through the vents and 1 forward (under switches on GS) holding the console which will be the same, you’ll need to remove the armrest and NIT unit to get access, this must have been done by someone a few times before?
 

TimR

Member
Messages
1,011
Ive tried it....there are a couple on the front, sides apparently...(4200 manual) ?
 

jasst

Member
Messages
897
Ive tried it....there are a couple on the front, sides apparently...(4200 manual) ?
Yes there are, they are on the bottom near the front, you have to slide seat all the way back and pull the carpet back from transmission tunnel to find them.