Block heater heat output? What does your temp. ga. read? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 01-15-2007, 03:03 AM   #1 (permalink)
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Block heater heat output? What does your temp. ga. read?

Does the block heater need replacing every few yrs. like a hot water heater element in your home water heater? I could swear mine used to do a better job and show a warmer temp on the gauge when I first turned the key on after an overnight plug in. I use a 12 ga. 3 wire cord 75 ft. long. (closest outlet to my truck)

Just curious what everyone's temp. gauge shows after an overnight plug in, and at what outside air temp.?

Jim
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Old 01-15-2007, 03:10 AM   #2 (permalink)
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Re: Block heater heat output? What does your temp. ga. read?

I don't think I've ever seen the temp gauge register when plugged in. Of course it's usually below 20F when it's plugged in, and I typically only run it for 2-3 hrs.

I'd guess that's a touch colder than where you are. [img]/ubbthreads/images/graemlins/phoney.gif[/img]

Unless you have some real crap in your cooling system, the block heater won't go south on you like the one in your water heater. It gets coated with a new batch of calcium coming from the water entering the heater.

If your block heater is working at all, it's most likely pretty close to the output (1000W) it had when new.
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Old 01-15-2007, 11:16 AM   #3 (permalink)
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Re: Block heater heat output? What does your temp. ga. read?

Around freezing my gauge starts just below the bottom of the normal running range, runs quiet and the heater works immediately. It has been around 0 the last few nights. The gauge starts on the peg and the truck rattles a little. The heater still warms me up lightyears ahead of my wifes Subaru on a cold start. I think I read somewhere that the block heater will keep the water about 50 above ambient?
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Old 01-15-2007, 01:21 PM   #4 (permalink)
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Re: Block heater heat output? What does your temp. ga. read?

My transmission gauge always registers above the coldest tick mark when I have mine plugged in ( below 40F I like it to warm up faster [img]/ubbthreads/images/graemlins/wink.gif[/img]

The engine temp rarely moves from it's lowest post but I always know it is working based on the trans gauge.
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Old 01-15-2007, 02:00 PM   #5 (permalink)
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Re: Block heater heat output? What does your temp. ga. read?

I use block heaters on several engines. Most are industrial though. Ive never had one that would warm the engine up enough to register on the temp gauge. If you feel the side of the block with your hand it may feel just barley warm depending on the ambient temp.
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Old 01-15-2007, 02:30 PM   #6 (permalink)
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Re: Block heater heat output? What does your temp. ga. read?

Turn the heat on when you first start it. If you get air that is
warmer than outside, Then it is working. I think its a case of
work's or doesnt work. But I have been wrong before.
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Old 01-15-2007, 03:21 PM   #7 (permalink)
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Re: Block heater heat output? What does your temp. ga. read?

Depending on the ambient temperature, I have seen as high as 100 after 10 hours of block heater use. That was on a night when the temperature was in the 30s rather than dipping to the predicted temp of below 20 (My daughter unplugged the cord from the timer so she could plug in her stereo while working on her dirt bike. Forgot to plug it back into the timer. Grrrrr). Normally, I plug in for 3-4 hours and when it is 20 outside, I will see a coolant temperature of about 70. BTW, I have a digital coolant temp sensor plugged into the drain plug in the driver's side of the block. I do not think the OEM gauge moves until you are over 100 but I may be wrong, I do not look at it anymore.
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Old 01-15-2007, 03:22 PM   #8 (permalink)
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Re: Block heater heat output? What does your temp. ga. read?

The actual measuring range of your temp gauge is way too high to register anything when you use your block heater under normal conditions.

My pyrometer will show 50*F to 70*F depending upon how cold it is outside. That's not the water temp, but it tells me the heater is working when it's -30*F, like this last Thursday & Friday.
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Old 01-15-2007, 03:26 PM   #9 (permalink)
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Re: Block heater heat output? What does your temp. ga. read?

Thanks to all. By your input, I guess mine is still doing all it's supposed to do.

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Old 01-15-2007, 04:14 PM   #10 (permalink)
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Re: Block heater heat output? What does your temp. ga. read?

If I plug in for a few hours - it will register on the lowest mark of the range, as well after a few seconds )I guess it needs to circulate...

Check your electric meter plugged in vs. not - it should spin pretty well - I think it will either work or not.

There is probably a resistance measurement I could take and post (with the ambinet temp today). It's actually 27 just outside of Austin!!!
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