SOURCE: Replace Heater Core for Volvo S70 (1999)
It is your heater core. I fixed mine for $144. Ordered the new part on Ebay and followed these instructions http://www.volvospeed.com/vs_forum/index.php?showtopic=9717 It was very simple, I'm a middle age grandmother! The hardest part was cleaning up all the antifreeze. You will need a shopvac, a small one is $20 at WalMart.
SOURCE: 1998 volvo s70 heater smells strange and smoke fills the cabin
Your heater core is leaking. The smell and smoke is from the coolant evaporation.
SOURCE: diagram of timing belt on 2000 volvo s70
Sorry for the delay.
I am personally going back to answer your unanswered question. I do not know if you still need the answer, but I am going to answer it in case you still do.
Click on the following direct Link. It has the Timing Belt/MARK(S) Diagrams that you will need, complete with Instructional and Directional Diagrams.
Again my apologies...
Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
http://www.2carpros.com/car_repair_information/year/1999/make/volvo/model/s70/1999_volvo_s70_timing_belt_diagram_marks.htm
Alternator, Replace -> With Air Conditioning -> Without Air Conditioning
Vehicle: 1998 Volvo S70 2.3 L5 GAS
With Air Conditioning
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