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Does your unit come on at all or does it have to be "jump started" by pushing the defrost button?
If this is the case you may want to look at the temp interlock circuit. On my 84 SD the sensor is just above the thermostat.
This senses the need to turn the system on, that is ,once the unit calls for heat then makes sure that the coolant is warm enough to allow the fan to come on
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Ron
2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD 
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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