7.3 block heater - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 01-15-2011, 11:55 AM Thread Starter
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7.3 block heater

what do u have to do to replace the block heater on a 7.3. is it a hard job to do.
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post #2 of 7 Old 01-15-2011, 01:21 PM
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Na, it's pretty simple.

It's right next to the oil filter, just unplug it and take it out with a big socket.

I was just in there doing my oil cooler which was a PITA, probably easier with the truck on a lift but my father-in-law didn't think I'd need the one that the previous owner had in my shop before I moved in

The block heater is a pretty simple device though (think little electric charcoal starter), is yours leaking? I don't see how one could go bad but I could be wrong....

Good luck,

John Matthews
Heartbeat Power Products, LLC.
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post #3 of 7 Old 01-25-2011, 02:33 PM Thread Starter
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it duse not seam to keep the truck worm at all
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post #4 of 7 Old 02-07-2011, 06:43 AM
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Pull the cord off the heater and take a volt meter and check to see if you are getting 110v. I did this with mine and was only getting 50v. I replaced the plug and it works fine. If I remember right doesn't the heater sit in antifreeze ? It's been a looonnnnggggg time since I replaced mine and don't remember.
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post #5 of 7 Old 05-13-2011, 05:33 PM
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ya when i did mine i did my oil cooler as well..drain ur coolant and i think it was an inch and one quarter i could be wrong but u take the heater right out. i replaced my cord and heater. i replaced an end on it before and i said screw it i was gonna do it all cuz my meter said it was just my heater and i got a heater on ebay for 50 bucks brand new heavy duty with a cord so i replaced it all. what a differents i had heat on the way to work
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post #6 of 7 Old 05-13-2011, 06:47 PM
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Yup, as usual, test before replacing. Another test - Check resistance at the "wall" plug up front. Normally it's 14-ish ohms. Then unplug it at the heater as Pete suggests, and check the resistance at the heater itself. It should be about the same. If you get 14-ish ohms at the heater, but more at the plug up front, then the cord is bad. The cord is generic; I've seen listings for it on NAPA's web site.
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post #7 of 7 Old 11-10-2014, 06:04 AM
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stuck heater

I have been trying to change my block heater on a 1996 7.3 but it seems to be frozen. Any way to unfreeze it without damaging the fitting?
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