Block Heater Recall Replacement - Page 12 - Chevy and GMC Duramax Diesel Forum
L5P TSB (service bulletins, recalls, updates) Postings of Tech Service info for any New L5P engine issues.

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post #111 of 142 (permalink) Old 12-14-2019, 07:58 AM
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Originally Posted by mizterwizard View Post
I've had block heaters on several vehicles I've owned. It usually isn't about being able to start but more about having a heater that works right off the bat and making life easier for the engine. Besides, a warm engine gets better fuel economy than a cold one so the cost of heating the block is somewhat offset by the improved economy.

For this use I would want a heater that worked any time it was plugged in, not just when the temps are below a certain trigger temp. Maybe it would be a problem with the programming in the ECM that expects a certain coolant temp drop relative to the OAT over time but if that was the case I think it could be fixed with a tune. Of course tuning the L5P is not easy or cheap but if I was getting a tune I'd ask for this change.
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But I have to say the 2019 high idle is much more efficient and eng up to temp far superior than my 2013
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post #112 of 142 (permalink) Old 12-17-2019, 07:51 PM
 
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Called service today to see if parts were in yet and have an appt tomorrow to finally get it fixed.
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post #113 of 142 (permalink) Old 12-18-2019, 02:42 PM
 
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How many of you that have already had your engine block heater fixed have had to go back because the engine coolant low warning came on because the dealership didn't put in enough fluid?
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post #114 of 142 (permalink) Old 12-18-2019, 06:47 PM
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Got my letter today my parts are in and have an appointment for the heater replacement on Friday. Thanks for the heads up on the coolant, I will make sure to remind them to fill it. Is there something special about filling/venting on the Duramax engines?

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post #115 of 142 (permalink) Old 12-18-2019, 06:53 PM
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Anytime you open up the system and refill, there's always a small amount of air left that will purge as you drive. Service will burp and fill as much as they can.

It's quite common to have to add a bit of coolant the next day or so as the level stabilizes.

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post #116 of 142 (permalink) Old 12-18-2019, 07:28 PM
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Originally Posted by Hook'em_Horns! View Post
Anytime you open up the system and refill, there's always a small amount of air left that will purge as you drive. Service will burp and fill as much as they can.

It's quite common to have to add a bit of coolant the next day or so as the level stabilizes.
Actually the problem is compounded because the air gets introduced and then subsequently trapped down low on the engine because that's where the heater is located.

If you're just filling up an open container then air wouldn't be getting trapped. Unfortunately it's all the twists and turns of the plumbing that causes air to get trapped.

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post #117 of 142 (permalink) Old 12-18-2019, 07:49 PM
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Heater.....as in the heater core, not the block heater.

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post #118 of 142 (permalink) Old 12-19-2019, 10:55 AM
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Originally Posted by bkool5 View Post
How many of you that have already had your engine block heater fixed have had to go back because the engine coolant low warning came on because the dealership didn't put in enough fluid?
It's not uncommon the dealer try's to burb all the air out but sometimes it has to be driven a few hundred miles before all the air gets out no big deal just add a little coolant and your good to go

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post #119 of 142 (permalink) Old 12-19-2019, 08:14 PM
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I threw a Phillips & Temro oil heater and P&T transmission fluid heater on her this summer, realizing "winter is coming" and it would take a while for GM to sort things out. I also have P&T battery heaters. I tied all of this stuff together into one Noco shore power outlet mounted in the bumper valence (see picture). Once I get the block heater recall done, I will add it to this circuit. Total amps will be ~10.7.

Also threw a Noco waterproof marine grade battery charger on her, powered on a different circuit through a second Noco shore power outlet through the bumper valence. I built a bracket and mounted the charger behind the front bumper.
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post #120 of 142 (permalink) Old 12-22-2019, 01:52 PM
 
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Originally Posted by bkool5 View Post
How many of you that have already had your engine block heater fixed have had to go back because the engine coolant low warning came on because the dealership didn't put in enough fluid?
Yep. They brought my truck around and the low coolant light was on. The mechanics had left so I went home and topped it up the next day. Two weeks later it's down again so I topped it up again. By quite a bit this time. I'm going to take it back tomorrow to see what's going on.

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