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  #1  
Old 11-13-2007, 04:51 PM
300SD81's Avatar
1981 Mercedes-Benz 300SD
 
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Less heat after block heater install?

I recently installed a tank style block heater, with hose from the engine drain plug to where the coolant goes to the block from the heater next to the oil filter. I'm feeling less heat than before at the vent. Would the coolant prefer this path rather than going to the heater core? Or could it be the Y fitting is too restrictive?

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Old 11-13-2007, 05:00 PM
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Did you burp the engine?
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Old 11-13-2007, 05:00 PM
C Sean Watts's Avatar
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You have

An air bubble in the system - I'm guessing somewhere in the heater core.
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  #4  
Old 11-13-2007, 05:02 PM
ForcedInduction
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The coolant is bypassing the heater through the block heater. You should install a valve in the line with the block heater.

If you look through the parts yards you can find vacuum operated valves. You would be able to T it into one of the ACC vacuum lines to close the valve anytime you turn on the heater.

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