hi, can some one help please?, my truck is a discovery 200tdi 1992, the heater blower has packed up, fuse is fine. when you push the slider across the dash lights go dim so I assume the power is getting to the switch, can anyone help. thanks.

 

One step would be to remove the heater fan (drops down with three bolts after you remove some trim to get at it). They can become packed with leaves, pine straw, hood insulation, mouse nest, etc. You would then be in a position to do electrical troubleshooting. The RAVE set of shop manuals has electrical drawings.

The switch is a frequent offender, many times you can tap it with your finger straight into the dash and have everything come back to life (in my case the AC and fan shuts off, tap it and it is good for a few days).

 

Remove the HVAC panel, remove the switch, clean it with electrical parts cleaner, rough up the contacts with emery cloth or a light steel wool, clean with electrical parts cleaner.
Once dry put it all back.
There is a copper ribbon behind the switch, the switch has contacts on it, they get corroded and electricity can no longer travel through them thus no fan, or the fan only works when you wiggle the switch.
Takes 15min.

Turn all ***** all the way to the left, pull them off, remove 2 screws, remove HVAC panel, follow instructions above.

 

hi again, thanks for advice. my truck has sliding controls on the heater, no *****. its an original disco1. since asking I have removed switch and put a wire from the live terminal on the block to other terminals on the block and still no joy, do you think its kaput.
thanks again.

 

Electrical troubleshooting without a meter is a problem. Checking voltage across the fan terminals and working back thru the schematic may yield more info for the exact problem.

You'll see in attached schematic from the RAVE that there is a 60 amp fuse under the bonnet, it sends power thru a fan relay, to the fan motor, and thru a series of speed control resistors to chassis ground. High speed setting is fan motor direct to ground.

So you could have a break anywhere along that path, like blown fuse, fried relay contacts, motor windings open, resistor not connected to ground, etc.

As an early model yours may be slightly different, but this is the basics of the fan system.

 

Yeah I forgot that you have the "hard" dash, same as the Range Rover Classic.
You dont need to have the rotary *****, its the fan switch thats bad.
Check the blower motor, make sure it works, then replace the switch on the dash.

 

thanks spike555 and thanks savannah buzz for all your advice its been a great help.
I can get out there now and have a good look at it. its good to know there is good old fashioned help out there thanks again.

 

re: its good to know there is good old fashioned help out there

I'll carry the water on the "old" part and Spike totes the "help" part. BTW, you are in a scenic area, the real country at the coast.

 

you are right, and its a great place to live, and a great place for seeing what a land rover was made for. thanks again.