BMW E36 heater matrix pipes replacement.
This guide will help to show you how to replace the plastic pipes that go through your bulkhead to your heater matrix on your BMW E36. Over time the plastic goes brittle and the pipes can snap and/or fail suddenly.
Broken pipe sticking out of the bulkhead.
Remove the plastic heater grill and the rubber seal.
Remove the two Philips screws.
Remove the 3 x 7mm bolts/screws from the bulkhead panel.
Pull out the heater panel.
Pull out the plastic motor cover panel.
Here you can see one of your two pollen filters. These have been in a long time(Filthy). Pull your pollen filters out and replace them while you are here if they are bad.
Here's the heater rheostat.(Non air con, Compact model)
Here you can see the plastic pipe housing you are replacing, remove the 10mm nut and pull the pipe housing out.
Make sure there is no broken plastic left in the matrix metal pipes and you have removed the old O rings.
Here's your new housing with new O rings fitted.
Bolt it back up.
Here's the new pollen filters fitted.
The rest of the job is a reversal of removal. All that is left at the end is bleeding the cooling system, which can be found here.
1. Jack the front of the vehicle up onto stands as high as possible,
2. Turn the ignition on to Aux 2, Engine OFF, heater on fan setting 1 and temperature fully hot,
3. Remove the rad cap/expansion cap and remove the bleed screw from the radiator,
4. Fill the radiator/expansion tank up and keep pouring till there are no more air bubbles coming out from the bleed, using a funnel that fits tight in the expansion tank neck and filling it full of water will help push any troublesome air out, when good you can then install the bleed screw and tighten it down(don't snap it), ensure the rubber O-ring/seal is still on the screw/on the bleed hole.
5. Suck some water out so it's not full to the brim, start the car up and check coolant shoots out of the small hole on the inside of the expansion tank neck when the revs are held up, if it does then run the car up for 30 seconds, then switch it off and repeat steps 3 onwards to ensure no more trapped air is in the system,
6. Refit your radiator cap and run the car up, check for heat from the vents when the car is warm, then carry on and check if over heating still persists. You may have to bleed troublesome cars again afterwards.(but very rare).
7. If all is good then check the water level again in the morning when cool.