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Sounds like the thermostat is not closing completly if
at all. When you're driving or running it up to 2000 rpm. the engine is working and gets warmer, at idle
no work no heat. replace the thermostat and I think
that will warm things up. Hope this helps.
you have to refer to the owner's manual. that is where they list the fuse/relay locations. if not there, you may need to refer to the diesel supplement book. but i think it will be in the owners manual. i have a 2002 f250 and that's where mine are.
glow plugs run off the battery . the plug is for a block heater that you may or may not have . if you have a plug it is behind the grill on pass side , it has a cap over the prongs so you might not think of it as a plug untill you pull the cover off . if you ask nice any shop in your area will show you where it is or where its not . good luck
It sounds more like the glow plugs, the older models had trouble out of the module, but the 6.0 is pretty safe from all those problems. And don't forget to use the correct fuel additive for diesel engines, it helps .
Bad glow plugs most probably or the glow plug controller. to check your glow plugs remove wire and check with ohm meter to ground. if they are working you should get a low ohm reading if one has a high ohm reading it is bad. if all injectors check good make sure your fuses are ok, also check and see if you hear the controller click when you turn the key to on. Does the wait to start light come on?
The block heater is already installed in your 6.0. The cord may not be there as it is an option in some states and standard equipment in others. The best way to see if your cord is there is to crawl under and look up by the # 4 cyl and you will either see 2 prongs sticking out for the cord or you will see the cord. The cord should end in the front bumper behind where the front tag would be. If you dont have the cord Id suggest getting it off ebay as it should be cheaper than the dealer. Hope this helps.