I have a newly-rebuilt engine, including a new engine block heater, on
my W123 300D. As it is no getting cold at night, I plugged the block
heater in, it worked splendidly ONE night, the engine started smartly
the next morning, and the block heater hasn't worked since.
Is there anything to look for or consider other than just a
prematurely failed block heater unit. Everything was new on this,
heater unit and wiring.
I'm quite familiar with the Benz block heater.
Get out your volt-ohm meter and start checking. I think the heater element
drawsa bout 500 watts, so the resistance of the heater should be around
The power cord attaches to the block unit using a knurled threaded collar.
It's possible that wasn't made secure on assembly. I've seen the power cord
develope an internal break too.
Also, in deference to an earlier poster, I want to correct myself on
an earlier post--the Mercedes Block Heater cord DOES detach from the
back of the unit, and I did not see this until I removed the air
cleaner pan and was able to get at the actual block heater unit.
Sorry for the mis-statement.
The block heater was the last component on the engine to be replaced.
Everything under the hood, except for the radiator cap, has been
replaced, and I'm hoping to get at least 200-300 miles out of the car
before I have to start replacing things again...
200 to 300 miles? Your expectations seem exceedingly low. I have been
following your travails with astonished incredulity. I thought Der Klunker
was bad. I was about to abandon it the other day when the battery turned
up dead. But the dome light had been left on for several days.
Nonetheless, the next time I am facing a $400+ bill I will simply hand
over the keys to whomever wants to charge me that. Totally undependable
transportation is no transportation at all.
Did I tell you about the gear shif lever separating itself from the
transmission? I think I did. A vise-grip wrench worked very well.
While I was joking, of course, about the 200-300 miles, it makes it
even more ironic that, when I went out to the car this morning, the
radiator had failed, spilling and emptying its contents during the
night. The only mileage I got out of the car was the 3 miles from the
shop to home.
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