That unit is very similar between D2 and D3 and incorporates the auxiliary water pump, which has a habit of failing and getting very noisy.
On both my D2's I've had to disconnect power to it as the noise got excessive, BUT the heating still works though takes a little longer to warm up in the cabin.
However, the main point of this is that the pump also drives the circuit for the "Rest" heating function, which I have never ever found a use for.
BUT it's worth testing - get the engine warm, turn off ignition and then try the Rest heater. The HVAC should start up; see if it's warm or cold in that scenario.
As noted above, it's a bit of a mission to change the unit (and expensive) so you do need to be sure that's absolutely necessary.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 30th April 2014 at 09:47 PM.
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