Block heater change question
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Posting Guru
Joined: Aug 2006
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From: Perry Georgia
Block heater change question
I'm changing the block heater on my 1987 F250 with a 6.9 Diesel N/A. The old one quit years ago and since I'm down for a couple things like IP and injector change thought I'd go back to using the block heater. Any suggestions when I change the element of what to do and what not to do? I got the block heater from NAPA and it looks like the one I need so now the fun begins. Any suggestions will be appreciated.
Post Fiend
Joined: Nov 2005
Posts: 7,437
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From: Charles Town, W bygod Va
Check continuity with an ohm meter. At the plug that you plug into the ext cord, you should have continuity between the 2 flat terminals if tbe cord and heater are good. If not unplug the cord from tbe heater then check for cont between each of the flat terminals and the other end of the cord. You can also check the block heater itself but its hard to access.
Lead Driver
Joined: Oct 2003
Posts: 8,476
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From: Madison, WI
You actually want to measure the RESISTANCE at the plug. The resistance between the two flat blades should be about 14 ohms. Then measure at the element (round terminals). Should be very close to the same. If it's "open" (infinite resistance) right at the element, the element is bad. If you get something close to 14-15 ohms at the element, the element is good. If so, and you get a lot higher resistance at the grille plug, or "open" (infinite) at the grille plug, the cord is bad.
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immastrokinnow
1994.5 - 1997 7.3L Power Stroke Diesel
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Feb 23, 2008 10:43 PM
