heater stoped working!

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garryh69

New Member
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31
I have a 1996 Defender 90 and the heater stopped working, i bought a secondhand heater box from fleabay and it still dont work? i cant get my head around why it wont work but took a direct current to the fan ind all is fine, All fuses look ok but dont know which one the fuse for heater is exactly?

i have even replaced the switch on the dash and still nothing,

Is there anything i am missing?

How do i do a check to see if theres a blown fuse?

Does it run of a relay of some sort?

Please help it's bloody freezing driving without heat.:confused:

Thanks
 
Surprised you'd notice the difference:D

Fuses are best checked with a multi meter - or a battery, bulb and length of wire

Wonder if the wire from the switch to the fan has broken or chaffed. Might be worth a quick continuity check from the dashboard switch to the connector in the engine bay
 
Your fuses are shown on the back of the panel so you should be able to see which it is..are you sure the cable hasnt slipped off...even if its off you should still feel some heat if the lever is on 'hot'...
 
no i replaced the switch on the left, all mechanical cables work fine.

could do with knowing the path of the wires from the switch to the heater, does it go to a relay?
 
Even if the fan isn't working he should get some warm air thru the vents...may take a few miles though...my heater is either off or hurricane...no in-between. I'd check/clean the bullet pack connectors that lead from the box to the cab via the bulkhead..
 
Station House said:
From the OP, I took it that the fan wasn't working

Does the fan work but it is just blowing cold air, or is there no fan noise?
Click to expand...

The fan motor is not running, all manual cables work fine eg hot and cold.

I routed a wire from the battery directly to fan and it fires up no problem
 
Well then you need to trace the fan wire back all the way til you find where its broke/disconnected....or wire something direct from the fan to the battery via a fuse and switch..eek...electrickery.
 
Right then - there's no relay. Just two wires from switch to the heater - one is green/yellow, one is green/slate. The feed from the fusebox is purple/green.

So, check you've got power at the switch (purple/green) wire - if not, that's your problem. If you do, check continuity between switch and heater.

Hope that helps.
 
Got stopped by a guy driving a new defender once and he told me the heater wasn't working, I did the normal, checked the pipes were hot at the matrix, checked all the connections and cables were okay, no problems,

Then I lent into the cab and pulled the lever for the fan, his face lit up, went on to explain that it was his first Landy whilst I tried not to laugh too much.

Lee
 
I would take the heater leaver apart on the dash, and join up the wires and see if the fan goes. you might have a bad connection there?

It's just a few screws holding the instrument panel part of the dash on, which you can then move enough, and then two screws holding the heater level in, which you can then pull out and pull the wires off and check all of your connections and stuff.

there are two different live wires, one which sends current directly to the heater fan, and another which sends the current through the resistor on the heater fan, so it's a pretty simple set-up :) the lever simply links up one or other of the live wires to the earth, and there is also a cable which opens the vent which is operated by the same lever.

I'm not very good at electrics, so take anything I say as something which I've just tried muddling through myself, probably badly ;)
 
You're spot on, tombardier. And the fella says his fan does work when connected directly to the battery. So it shouldn't be too tricky to work out where the break is.
 
tombardier said:
I would take the heater leaver apart on the dash, and join up the wires and see if the fan goes. you might have a bad connection there?

It's just a few screws holding the instrument panel part of the dash on, which you can then move enough, and then two screws holding the heater level in, which you can then pull out and pull the wires off and check all of your connections and stuff.

there are two different live wires, one which sends current directly to the heater fan, and another which sends the current through the resistor on the heater fan, so it's a pretty simple set-up :) the lever simply links up one or other of the live wires to the earth, and there is also a cable which opens the vent which is operated by the same lever.

I'm not very good at electrics, so take anything I say as something which I've just tried muddling through myself, probably badly ;)
Click to expand...

Good idea. By the way, are you refering to the 'on/off' lever, or the 'hot/cold' lever?
 
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