To Those Who Have Had The Heater Box Apart...

[peterguk]

OK, so in my quest to get my heater fan working, i have established that my fuse and relay are good, and that i have volts to the appropriate pins on the plug which enters the N/S of the heater box.

I now suspect the resistor pack as opposed to the heater motor, so does anyone know whether the resistor pack is easily accessable, or is it mounted inside the heater motor???

TIA

[F.C.]

peterguk said:

OK, so in my quest to get my heater fan working, i have established that my fuse and relay are good, and that i have volts to the appropriate pins on the plug which enters the N/S of the heater box.

I now suspect the resistor pack as opposed to the heater motor, so does anyone know whether the resistor pack is easily accessable, or is it mounted inside the heater motor???

TIA

There is a small panel secured by a screw adjacent to where the plug goes in to the box the "resistor" pack (haha) is there.
F.C.

Edited by F.C. on Wednesday 13th February 00:05

[LOONER]

I have just done mine. It took about 45 mins to get the box out I then cut it open (very neatly) replaced the whole blower motor with a MK5 Escort one sealed the box again and installed it. You would never even notice the difference apart from now the heater works ! It was quite easy to do and took one evening - better than paying £650 plus labour for a new one !

[NobleGuy]

peterguk said:

OK, so in my quest to get my heater fan working, i have established that my fuse and relay are good, and that i have volts to the appropriate pins on the plug which enters the N/S of the heater box.

I now suspect the resistor pack as opposed to the heater motor, so does anyone know whether the resistor pack is easily accessable, or is it mounted inside the heater motor???

TIA

Yep, panel on the passenger side. When I took mine out recently and disconnected it, the fuse continued to blow with the swithes on Off. Does that indicate that the wiring before the fuse/relay is my problem? Also, can I ask if the relay for your heater (top right on the box?) is a different spec/configuration to the others? Mine is.....

[peterguk]

NobleGuy said:

peterguk said:

OK, so in my quest to get my heater fan working, i have established that my fuse and relay are good, and that i have volts to the appropriate pins on the plug which enters the N/S of the heater box.

I now suspect the resistor pack as opposed to the heater motor, so does anyone know whether the resistor pack is easily accessable, or is it mounted inside the heater motor???

TIA

Yep, panel on the passenger side. When I took mine out recently and disconnected it, the fuse continued to blow with the swithes on Off. Does that indicate that the wiring before the fuse/relay is my problem? Also, can I ask if the relay for your heater (top right on the box?) is a different spec/configuration to the others? Mine is.....

From memory, the relay was the same. Try unplugging the heater fan near where the wiring enters the heater box. N/S, under the wiper motor. Then see if your fuse blows. If it doesn't, then your problem lies inside the heater box (fan or resistor pack shorting).

[F.C.]

peterguk said:

NobleGuy said:

peterguk said:

OK, so in my quest to get my heater fan working, i have established that my fuse and relay are good, and that i have volts to the appropriate pins on the plug which enters the N/S of the heater box.

I now suspect the resistor pack as opposed to the heater motor, so does anyone know whether the resistor pack is easily accessable, or is it mounted inside the heater motor???

TIA

Yep, panel on the passenger side. When I took mine out recently and disconnected it, the fuse continued to blow with the swithes on Off. Does that indicate that the wiring before the fuse/relay is my problem? Also, can I ask if the relay for your heater (top right on the box?) is a different spec/configuration to the others? Mine is.....

From memory, the relay was the same. Try unplugging the heater fan near where the wiring enters the heater box. N/S, under the wiper motor. Then see if your fuse blows. If it doesn't, then your problem lies inside the heater box (fan or resistor pack shorting).

The resistor pack is laughable it cosists of two coils of wire that are not really supported in any way (not wrapped around ceramic insulators). This is what happened to mine, one of the resistors must have streched when hot and it actually melted its way through the plastic and into the fan impellar!!.
I also re-built my heater box with an escort fan blower, but then a complete original heater box became available so I modded that instead.
F.C.

[NobleGuy]

peterguk said:

NobleGuy said:

peterguk said:

OK, so in my quest to get my heater fan working, i have established that my fuse and relay are good, and that i have volts to the appropriate pins on the plug which enters the N/S of the heater box.

I now suspect the resistor pack as opposed to the heater motor, so does anyone know whether the resistor pack is easily accessable, or is it mounted inside the heater motor???

TIA

Yep, panel on the passenger side. When I took mine out recently and disconnected it, the fuse continued to blow with the swithes on Off. Does that indicate that the wiring before the fuse/relay is my problem? Also, can I ask if the relay for your heater (top right on the box?) is a different spec/configuration to the others? Mine is.....

From memory, the relay was the same. Try unplugging the heater fan near where the wiring enters the heater box. N/S, under the wiper motor. Then see if your fuse blows. If it doesn't, then your problem lies inside the heater box (fan or resistor pack shorting).

Hmmm. It does blow even when the heater is disconnected and completely removed. Should get the car back this week so I'll have to double-check the wiring at the fuse box and beyond.

[NobleGuy]

Just in case it's of interest, found that my relay configuration was wrong and was causing the fuse to go. I have 4 blue ones which are 30/20A (as opposed to the rest which are 30A) and need to be put in the correct slots. The wiring behind the fuse box looks like it interlinks the HVAC and cooling fan electrics (which require my blue relays in the row below) - must have been sending power to places where it shouldn't. Not sure how they got mixed up in the first place .

Least I'm not going to be frozen today with my new tunnel mod like I was yesterday...

Edited by NobleGuy on Saturday 16th February 11:24