Thread: Defender Heaters

Hi David,

Probably the first thing to check is that the flaps in the heater box are moving as they should. Sometimes the outer cables can slip through the clamps on the heater box and then the flap won't move it's full travel. From memory the cable (and therefore lever) on the top of the box controls a flap which directs the incoming air either around the matrix or through it. Disconnect the inner cable and move the lever by hand to make sure it feels like it's moving full travel. Perhaps mark or take note of the lever position at either end of the travel and then reconnect the cable and adjust to the same limits.

Another possibility is that your matrix is blocked (or maybe the hoses running to it), but I think they are more prone to leaking than blocking. If this is the case, or you can't work out if the flap/flaps are operating correctly you might have to pull the whole box out and open it up to have a look inside. It's a very simple, self explanatory process, but allow about two hours.

A new matrix will cost you about $130 here or GBP35 + freight from the UK.

James.

Hi David.

I agree with all above but have just replaced the heater unit complete on mine. If yours has A/C allow time to remove the under dash evaporator unit to get at the two bolts at the back of the foot well. The bracket that holds on to the A/C unit is too long and I couldn't undo the bolts. And of course allow $100 or so to re-gas the system.

i have a spare heater matrix in good nick if you want it.

Nino

Thanks Niño mine is not air conditioned so it could be an easier job but I will check all of the flaps and their operation in the first instance and see how that goes. If it is not successful then I will contact you again about the heater matrix.
Regards
David

Agree with other comments.

Also... Reach under the heater box, grab the rubber bung and rip it out! Instead of letting water drain, it often just silts up and then clogs everything else up.

M

Defenders have heaters

Martyn

Originally Posted by Bushie

Defenders have heaters

Martyn

Yes, all Defenders have radiant heaters in the form of the transmission tunnel. Some even have additional fan forced units.

Cheers,

Tim

Originally Posted by Bushie

Defenders have heaters

Martyn

Back in the UK SWMBO used the 90 to drive 3 miles to work and the only way she would do this in winter was for me to "pre-heat" the cab with a portable 240v fan heater before I left for work! Extension cord through the back door and 10 minutes on full heat to de-ice the inside and outside of the windscreen!

I recently went all the way with mine.

After disconnecting hoses, and undoing 3 or four bolts the heater box wiggles out without too much trouble. I drilled out the rivets and peeled back the lid (maybe not required on newer verions), cleaned out all the innards and put in a fresh heater matrix. The flaps usually have some foam on each side to help them seal when shut, this had all perished so stuck some fresh stuff on. The seal between bulkhead and heater box had also badly perished so changed that along with the one that mates to the wing intake. Put it all back in and set the cable controls to shut the vent flaps hard. oh and I silicon sealed the seams of the box also where I could feel air leaks.

Toasty as can be and much stronger flow through.