Heater Hose Blew Out

[Joseph Garcia]

I was unable to post this photo of the connector that I had to cut out in my previous post as an edit, so I'm posting it here in a new post.

 

[Rocket Man]

Once the hoses are installed, what are your recommendations for preferred methods for refilling with coolant and purging of trapped air? Any concerns that I need to be aware of that are unique to these trucks?

Use Dexcool mixed 50/50 with distilled water.
From the service manual: (you don’t need to pay attention to the use of special tools or repositioning the clamp, they just mean to install it)


Filling Procedure

Notice: The procedure below must be followed. Improper coolant level could result in a low or high coolant level condition, causing engine damage.

1. Install the lower radiator hose to the radiator.
2. Using the J 38185 , reposition the lower radiator hose clamp.

Notice: Refer to Fastener Notice .

1. If the left and right engine block coolant drain plugs were removed, perform the following:

1. Apply pipe sealer to the drain plugs.
2. Install the drain plugs.

Tighten the drain plugs to 60 N.m (44 lb ft).

1. Install the engine block coolant heater, if equipped. Refer to Coolant Heater Replacement (LH6, LY2, LMG, LY5, and LY6) (See: Engine\Engine Block Heater\Service and Repair\Coolant Heater Replacement (LH6, LY2, LMG, LY5, and LY6))Coolant Heater Replacement (L76, L92) () .
2. Lower the vehicle.

Important: Use a 50/50 mixture of DEX-COOL antifreeze and clean, drinkable water.

1. Slowly fill the cooling system with a 50/50 coolant mixture. Refer to Approximate Fluid Capacities .
2. Install the coolant pressure cap.
3. Start the engine.
4. Run the engine at 2,000-2,500 RPM until the engine reaches normal operating temperature. Engine should reach an operating temperature of 90°C (194°F) and the upper radiator hose should be HOT.
5. Allow the engine to idle for 3 minutes.
6. Shut the engine OFF.
7. Allow the engine to cool.
8. Top off the coolant as necessary.
9. Inspect the concentration of the engine coolant using the J 26568 .
10. Rinse away any excess coolant from the engine and the engine compartment.

 

[Joseph Garcia]

Use Dexcool mixed 50/50 with distilled water.
From the service manual: (you don’t need to pay attention to the use of special tools or repositioning the clamp, they just mean to install it)


Filling Procedure

Notice: The procedure below must be followed. Improper coolant level could result in a low or high coolant level condition, causing engine damage.

1. Install the lower radiator hose to the radiator.
2. Using the J 38185 , reposition the lower radiator hose clamp.

Notice: Refer to Fastener Notice .

1. If the left and right engine block coolant drain plugs were removed, perform the following:

1. Apply pipe sealer to the drain plugs.
2. Install the drain plugs.

Tighten the drain plugs to 60 N.m (44 lb ft).

1. Install the engine block coolant heater, if equipped. Refer to Coolant Heater Replacement (LH6, LY2, LMG, LY5, and LY6) (See: Engine\Engine Block Heater\Service and Repair\Coolant Heater Replacement (LH6, LY2, LMG, LY5, and LY6))Coolant Heater Replacement (L76, L92) () .
2. Lower the vehicle.

Important: Use a 50/50 mixture of DEX-COOL antifreeze and clean, drinkable water.

1. Slowly fill the cooling system with a 50/50 coolant mixture. Refer to Approximate Fluid Capacities .
2. Install the coolant pressure cap.
3. Start the engine.
4. Run the engine at 2,000-2,500 RPM until the engine reaches normal operating temperature. Engine should reach an operating temperature of 90°C (194°F) and the upper radiator hose should be HOT.
5. Allow the engine to idle for 3 minutes.
6. Shut the engine OFF.
7. Allow the engine to cool.
8. Top off the coolant as necessary.
9. Inspect the concentration of the engine coolant using the J 26568 .
10. Rinse away any excess coolant from the engine and the engine compartment.

Super! Thank you.

 

[Rocket Man]

Super! Thank you.

You’re welcome. I just did mine in my 08 Silverado after a cam swap and the first time I started it it ran hot until I shut it down and let it cool, then when I came back and checked the coolant level was down by a lot because it had burped. I refilled it to the cold line and all is well.

 

[kbuskill]

In the real world having the nose of the truck up in the air helps to purge the air from the system.

The top of my driveway is quite steep, like 10% grade, and it works quite well if you back the truck in. Alternatively you could back down into a ditch ( just don't get stuck) or put the front wheels on ramps.

 

[camarolvr11]

The easiest way to do deal with that is to snap those small flat tabs off of each side and then you can either pull the connectors off or or keep snapping some more of the plastic part off until you can get them off, I would replace both hoses and "T"'s with new oem ones seeing those lasted over 10 years. the problem is common due to age and from heat/cold.

View attachment 249381

Does anyone know THE OEM part numbers for those quick connects at the heater core? I couldn't find them on gmpartsdirect.com

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[Doubeleive]

Does anyone know THE OEM part numbers for those quick connects at the heater core? I couldn't find them on gmpartsdirect.com

Sent from my SM-N970U1 using Tapatalk

These are the correct hoses and "T"s

 

[camarolvr11]

These are the correct hoses and "T"s

View attachment 249498

Thanks for the reply. So does the denali only have the t-fittings? Or does it also use the straight connector too?

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[Doubeleive]

Thanks for the reply. So does the denali only have the t-fittings? Or does it also use the straight connector too?

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all the suv have the T only the silverado's/sierra's use a straight connector, unless it's a older 2 door or something pre 00

 

[new2yukon]

So why not use the dorman replacement T?

Hmmmm....I replaced my oem about 4yrs ago with dorman. So far no issues....

Just wondering.