7.3 2001 Engine Block Heater - Ford Powerstroke Diesel Forum
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Old 01-27-2011, 06:10 AM
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7.3 2001 Engine Block Heater

Can anyone give me some insight on how to determine if the factory engine block heater has crapped out? Its been pretty cold lately and it seems like the block heater is not doing its job anymore. It used to warm the coolant up off of the cold end on the guage. It seems like it is not doing anything anymore. is there a fuse somewhere between the plug and the heater? is the heater removeable and replaceable? We are getting a snow melt over the next couple days and it may be a good time to crawl under and get this problem undercontrol. its been tough to get the beast going in the morning.

thanks
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Old 01-28-2011, 03:23 PM
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As far as i know there is know fuse and i have been all over mine.. (96 f250 7.3) what i did was plug it in and get under truck put your hand on the heater and feel if it is getting warm. i plugged mine in and by the time i got under it it was warm to the touch. also when you plug it in you should be able to hear the coolant gargling/sizzling quietly.
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Old 01-28-2011, 03:59 PM
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With mine:

-When I plug it in, I see the spark on the plug.
-After its on for a while, the cord is warm.
-When it's quiet, I can hear a humm/buzz sound with the hood up.

And it runs A LOT better on a cold morning that a cold/cold start.

Thats all the "help" I can offer.
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Old 01-28-2011, 04:14 PM
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sounds like glow plugs or the Glow plug relay not working. had the same problem. ended up being bad glow plugs but relay is more common, by all the forums i have read... i have replaced two gpr's on mine it 6 years. and gp 2 in 6 years so i cant tell you for sure what is more common out of experience. take a meter that measures DC Volts, find your relay (should be on top of motor behind fuel bowl) find the hot terminal on it should measure around 12v have some one turn the key on and read the other big terminal and see if you get 12v as well if not replace gpr. should take about 2mins to test.
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