2009 chevy silverado ltz block heater ?
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    jd1023epro's Avatar
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    2009 chevy silverado ltz block heater ?

    i have a 2009 Chevy silverado 4x4 ltz with the 5.3 lt vortex in it and it came with a factory block heater and im wanting to know how i can check to see if its working. i tried to touch were the block heater is but the exhaust pipe and the transfer case is in the way. i checked it with a volto meter and it jumped to the other side of the gauge. so i guess its working i plug it in when the temp gets below 30*f

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    If it's anything like my Cummins I can hear the coolant making noise soon after I plug it in. Once I hear the sound I know I'm good.


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    Captain Hook Kennyd's Avatar
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    You can check it with an Ohm meter if you have one. It should read near 0 ohms if its good.
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    Quote Originally Posted by Kennyd View Post
    You can check it with an Ohm meter if you have one. It should read near 0 ohms if its good.
    It shouldn't read near 0 Ohms. It should show resistance but not open. If it shows 0 it would be shorted out. Not sure how much resistance it should show though. It depends on the how many watts the heater is.

    I did a quick Google search and people are saying 500W to 1500W which is quite a swing which is odd. I would assume they would know what it is but maybe the range accounts for cars with a 4 banger and big V8s in trucks. Anyhow with those numbers I can give you a range of what you should see with an Ohm Meter by using Ohm's Law.

    So 500w and 115V are known. So lets first find Amps. 500/115 = 4.34783 Amps. Then take Amps * Volts = Resistance 4.34783*115 = 26.45 Ohms

    On the other end of the range we have 1500W

    So 1500W and 115V are known. So lets first find Amps. 1500/115 = 13.04348 Amps. Then take A*V=R 13.04348*115= 8.81667 Ohms.

    This tells us if you put your meter on Ohms (the setting that looks like a horseshoe) and put the probes on the two blades not the ground you should get a reading of between 26.45 to 8.81667 Ohms. If you get something outside of that range on the low side would mean it is shorted out and will blow your fuse. Above that range and it won't do much of anything.

    This also tells us something else. If you get a reading of around 8-9 you are going to be pulling nearly 15 amps on that circuit. If it is a 15 Amp breaker on that circuit and you have anything else plugged in, if it takes much of a load you will trip the breaker or pop the fuse.

    I could run out and put my ohm meter on my Denali but it is -3F out right now and pretty windy. Brrrrr
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    Quote Originally Posted by jd1023epro View Post
    i have a 2009 Chevy silverado 4x4 ltz with the 5.3 lt vortex in it and it came with a factory block heater and im wanting to know how i can check to see if its working. i tried to touch were the block heater is but the exhaust pipe and the transfer case is in the way. i checked it with a volto meter and it jumped to the other side of the gauge. so i guess its working i plug it in when the temp gets below 30*f
    jd1023epro: Does your truck not start without the heater?
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    Captain Hook Kennyd's Avatar
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    Quote Originally Posted by sennister View Post
    It shouldn't read near 0 Ohms.
    Yes, I was just trying to give him an idea on what the reading would be without overwhelming him, that's all. I guess it all depends on your definition of "near" also.
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    Kenny

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    My Vortec starts at -10 degrees F.,,, what temp do you have to get to that a gas engine needs heat?



    (SORRY,,, Virginia does not get below -10F. - ,,,, )

    Maybe it starts easy because the old cast iron 6.0 is worn and there is no internal friction,,,170K miles,,,,
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    Here how to check in 8 easy steps:

    1) turn key to ON ( do NOT start)
    2) note temp reading on gauges
    3) turn key OFF
    4) make sure outlet used has power
    5) plug in block heater to outlet used for step 4
    6) read posts on GTT for at least one hour
    7) turn key ON (do NOT start)
    8) note temp reading on gauges

    If temp reading in step 8 matches temp reading in step 2 it does NOT work

    If temp reading in step 8 is HIGHER than the temp reading in step 2 it DOES work
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    glc
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    I would think if the heater blows warm air, then it should be working.
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    Quote Originally Posted by CADplans View Post
    My Vortec starts at -10 degrees F.,,, what temp do you have to get to that a gas engine needs heat?

    (SORRY,,, Virginia does not get below -10F. - ,,,, )

    It is not that it won't start, it is a matter of how long it takes to warm up.

    Even though it would start, the engine will start happier if it isn't -10.

    We used a block heater in our Tundra when we lived in Montana. Started just as easy, but warmed up a whole lot faster.
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