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Old 01-01-2013, 01:55 AM   #1 (permalink)
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grid heater cycle?

just wondering how long the grid heater cycles.
when i start my truck in the cold, it turns on and warms the plenum and incoming air, then turns off to allow enough juice to start start the motor, then it cycles itself on and off while the truck idles and runs for a bit.

im wondering at what point the grid heater sees that the engine is warm enough and stops its cycling..... or does it?
from what i can tell, it seems to cycle for about 5 or 10 minutes once the truck is running. ???
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Old 01-01-2013, 02:18 AM   #2 (permalink)
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Yes the grid heaters will continue to cycle until the ECM reads a certain air temp in the intake. Unsure what it is tho. Moparman will tell us for sure. They will shut off at 15 MPH. Yes they will continue to cycle when the engine is running. Watch your amp gauge or turn your headlights on. They will DIM then go BRIGHT. As for the amp gauge the grid heaters will pull the gauge down while running from 14 volts down to around 9-10. Then shut off. Then recycle again until the proper intake air temp is reached and then they are shutoff. Either by the IAT or SPEED.
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Old 01-01-2013, 09:33 AM   #3 (permalink)
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Quote:
Originally Posted by theturbominivan View Post
just wondering how long the grid heater cycles.
when i start my truck in the cold, it turns on and warms the plenum and incoming air, then turns off to allow enough juice to start start the motor, then it cycles itself on and off while the truck idles and runs for a bit.

im wondering at what point the grid heater sees that the engine is warm enough and stops its cycling..... or does it?
from what i can tell, it seems to cycle for about 5 or 10 minutes once the truck is running. ???
Based on time or vehicle speed.

I think its like 3 minutes of idle time then it cancels. Or its reaching 20 MPH and cancels.
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Old 01-01-2013, 12:23 PM   #4 (permalink)
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Read THIS THREAD for information on intake air heater cycles.

John L.


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Old 01-01-2013, 06:16 PM   #5 (permalink)
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thanks guys. just wondering because i got so sick of never having good heat in my truck with these canadian winters that i bought a 1500w inverter and wired it in so i can plug in a 900w-1500w portable space heater next to me! hahahahah!
i just wanted to know when the grid heater finishes its thing so im not bogging down the battery with 2 heavy draws at once.

thanks guys!
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Old 01-01-2013, 08:16 PM   #6 (permalink)
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Originally Posted by theturbominivan View Post
thanks guys. just wondering because i got so sick of never having good heat in my truck with these canadian winters that i bought a 1500w inverter and wired it in so i can plug in a 900w-1500w portable space heater next to me! hahahahah!
i just wanted to know when the grid heater finishes its thing so im not bogging down the battery with 2 heavy draws at once.

thanks guys!
Be careful...

1500w = 12 Volts x 125 Amps

900w = 12 Volts x 75 Amps

Why not fix your failed thermostat and gain some block heat. Or even install a 6.7L Cummins 200*F thermostat for the winter time. Yes. It should fit.
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Old 01-01-2013, 08:22 PM   #7 (permalink)
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i did a new thermostat and all that. its COLD up here. im sick of waiting 25 minutes for my block to be warm enough to even begin to get some heat, and then have a crappy heater fan on top of that.
i wont need to be using the 1500w setting. its only a truck cab.
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Old 01-01-2013, 09:07 PM   #8 (permalink)
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Originally Posted by theturbominivan View Post
i did a new thermostat and all that. its COLD up here. im sick of waiting 25 minutes for my block to be warm enough to even begin to get some heat, and then have a crappy heater fan on top of that.
i wont need to be using the 1500w setting. its only a truck cab.
Huh? I can drive 5-10 minutes and be fully warmed up. 25 minutes? What are you doing idling waiting for the engine to warm up before driving? I just jump in and go and the heat coming with in a few miles. Even with my high idle mod I can be fully warmed up from sub zero weather in about 10 minutes.

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Old 01-02-2013, 12:47 AM   #9 (permalink)
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i WISH mine did that. ever since i bought the truck it takes forever to warm up. ill start it and let it idle on a cold morning for about 10min. on a colder morning it will high idle, but even then, as i drive, it takes forever to get to temperature in any kind of cold, even down the highway. i even have a piece of cardboard over the rad on colder mornings and its the same thing.
after changing the thermostat and rad cap a few weeks ago things got a bit better (temps more stable) but its still slow to warm up, and especially blow heat in the cab.
clogged heater core maybe?
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Old 01-02-2013, 10:08 AM   #10 (permalink)
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Quote:
Originally Posted by theturbominivan View Post
i WISH mine did that. ever since i bought the truck it takes forever to warm up. ill start it and let it idle on a cold morning for about 10min. on a colder morning it will high idle, but even then, as i drive, it takes forever to get to temperature in any kind of cold, even down the highway. i even have a piece of cardboard over the rad on colder mornings and its the same thing.
after changing the thermostat and rad cap a few weeks ago things got a bit better (temps more stable) but its still slow to warm up, and especially blow heat in the cab.
clogged heater core maybe?
All right here...
Mopar1973Man's Dodge Cummins Articles - High Idle Modification

And the TSB
Mopar1973Man's Dodge Cummins Articles - TSB 18-019-01 - Cold Idle Engine Warming

As for HVAC and heat cores
Mopar1973Man's Dodge Cummins Articles - Air Conditioning Evaporator Core / Heater Core Replacement
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Old 01-03-2013, 11:53 PM   #11 (permalink)
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sweet thanks! ill need those references now..... i decided the inverter and heater might be a real bad idea and took them back. hahahaha! it took me one day to decide that.
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