| oconn329 Member
 
 Date registered: May 2011
 Location: McDonough, Georgia
 Vehicle(s): 1987 300 SDL, 99 Quest, 96 Prism
 Posts: 5
 
 
 | coolant change 87 300 sdl 
 What am I doing wrong? Had to drain radiator to change vacuum pump, now that I've refilled coolant tank, runs hot. Radiator is cold, engine is hot. What did I not do.
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| BenzLover Member
 
  
 Date registered: Nov 2008
 Location: Vancouver Canada and Darwin Australia
 Vehicle(s): 123,126
 Posts: 18
 
 
 | RE: coolant change 87 300 sdl 
 
 You havent done anything wrong.  There is air in the coolant system that needs to release.When refilling the antifreeze always have the front end of the car on ramps,this will help the air evacuate.Always keep an eye on the temperature gauge to make sure it doesn't over heat.It takes a few minutes but air will evacuate and the temperature will return to normal.  Keep us posted  Cheers |