XM Heater Blower

Sailing · Unread post by **Sailing** » 21 Nov 2004, 21:28

XM 98 SX non aircon heater blower not working. Pre-failure symptons were delay in motor starting for a few seconds after lever set, then it kicked in. Sadly it no longer wants to start. Removed motor and no apparent damage; tried scrap replacement without success. Fuses seem ok. Any clues?

adzbaby · Unread post by **adzbaby** » 21 Nov 2004, 22:43

There is also a resistor hooked up for the heater blower, maybe thats dead? Have you checked that the reolacement is fine and working ok?

Robin · Unread post by **Robin** » 22 Nov 2004, 02:12

Problem with the control slider/knob contacts?

crooser · Unread post by **crooser** » 22 Nov 2004, 02:17

check the output transistors in the heater control module,it is quite common for one of these to fail.they are easily obtainable from maplin and easy to fit.they can be checked with a voltmeter.the cost of replacing them is only a couple of pounds compared to the price of a new module.

Sailing · Unread post by **Sailing** » 23 Nov 2004, 03:34

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by adzbaby

There is also a resistor hooked up for the heater blower, maybe thats dead? Have you checked that the reolacement is fine and working ok?
<hr height="1" noshade id="quote"></blockquote id="quote">Reply by Sailing
Thanks - I will check both over again

Sailing · Unread post by **Sailing** » 23 Nov 2004, 03:35

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Robin

Problem with the control slider/knob contacts?
<hr height="1" noshade id="quote"></blockquote id="quote">Reply by Sailing
Can I get access without taking the steering wheel off (as per Haynes?)

Sailing · Unread post by **Sailing** » 23 Nov 2004, 03:37

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by crooser

check the output transistors in the heater control module,it is quite common for one of these to fail.they are easily obtainable from maplin and easy to fit.they can be checked with a voltmeter.the cost of replacing them is only a couple of pounds compared to the price of a new module.
<hr height="1" noshade id="quote"></blockquote id="quote">reply by Sailing
Thanks - is this the module on the blower unit, and if so are they on the underside of the PCB?

Niek · Unread post by **Niek** » 24 Nov 2004, 02:04

I believe the Xm uses resistors to vary the blower speed instead of transistors. They are located on the blower unit, on the PCB. While you have the motor out, also check the brushes. My blower had been sort of stuttering for the past few months, took it out and found the brushes to be very thin. Used two little pieces of wood to increase the spring pressure on the brushes as a temp fix, still working well.