Mercedes Benz repair: heater 1987 mercedes 300SDL, number search results, mercedesshop

Question
87 mercedes 300SDL the heater does not blow any hot air. The ac works great. All controls seem to work but no heat just ambient temp or cold with ac on. One other problem when 1st start the tach does not work, after a couple of minutes the tach kicks on with an increase of engine speed.
       your advice will be appreciated, dave

Answer
Issue should be one or both of these parts.

PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1987 Mercedes Benz 300SDL
Part: Auxiliary Water Pump
 Note:  
This unit has 12" lead wire. Bosch 0.130.002.070     

G3050-12429 Auxiliary Water Pump Bosch IN STOCK $209.31  
  
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc...


PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1987 Mercedes Benz 300SDL
Part: ACC Mono Valve

 Note:  Heater Valve
Electromagnetic heater valve.     

R3022-11892 ACC Mono Valve IN STOCK $153.86  
  
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc...