6.0 Excursion - No heat, HELP?!

[il_duramax]

I work for a ford dealer, and were working on a customers excursion.

Its got a 6.0L and the original complaint from the customer was the rear heat was not working correctly.

After pulling it apart, inspecting the doors & motors in the air box all seemed okay, we replaced the heater core and did a thorough flush.

Result: Still no heat

We checked for any stoppage in the hoses and replaced the restrictor in the hose.

The coolant valve is functioning properly also.

Now that we replaced the restrictor, the front heat seems to be not as great either.

When your driving down the interstate it produces almost no heat, if your around town driving and the RPM's are high it does get warm and will heat the cab okay.

We replaced the control head (even though the blend doors and actuators seem to be working properly.)

-no air pockets (thoroughly bled)
-doors and actuators are working properly
-no blockage in coolant lines
- new heater core
-new control head
-blower motor works fine

The idea of blown head gaskets have been discussed (creating air pockets causing no heat) but I wanted to ask the guys at powerstroke forum for help.


Help getting the customers PS back to them and keep them warm in this chilling weather!

Thanks for any help in advance guys.

[dhanna6powerstroke]

Originally Posted by il_duramax

I work for a ford dealer, and were working on a customers excursion.

Its got a 6.0L and the original complaint from the customer was the rear heat was not working correctly.

After pulling it apart, inspecting the doors & motors in the air box all seemed okay, we replaced the heater core and did a thorough flush.

Result: Still no heat

We checked for any stoppage in the hoses and replaced the restrictor in the hose.

The coolant valve is functioning properly also.

Now that we replaced the restrictor, the front heat seems to be not as great either.

When your driving down the interstate it produces almost no heat, if your around town driving and the RPM's are high it does get warm and will heat the cab okay.

We replaced the control head (even though the blend doors and actuators seem to be working properly.)

-no air pockets (thoroughly bled)
-doors and actuators are working properly
-no blockage in coolant lines
- new heater core
-new control head
-blower motor works fine

The idea of blown head gaskets have been discussed (creating air pockets causing no heat) but I wanted to ask the guys at powerstroke forum for help.


Help getting the customers PS back to them and keep them warm in this chilling weather!

Thanks for any help in advance guys.

Hook the WDS scan tool to it and monitor your EOT and ECT values while driving down the road at full operating temp. If there is more than a 15* temp. difference between the two, you have a restricted oil cooler which in turn has probably ruptured the EGR cooler causing a no heat issue.

[il_duramax]

Ill give that a shot tommorow, wouldnt I have coolant spewing out the exhaust if the EGR Cooler was ruptured?

[dhanna6powerstroke]

Originally Posted by il_duramax

Ill give that a shot tommorow, wouldnt I have coolant spewing out the exhaust if the EGR Cooler was ruptured?

You could if it has completely blown. If the oil cooler has become restricted recently, it may have not damaged the EGR cooler yet. After you fix the problem, the best thing you can do for that 6.0 is get that Ford Gold coolant out and replace it with an ELC (Extended Life Coolant) that has an EC-1 rating. The gold coolant has silicates that gum up the oil cooler and cause the restriction. You have to flush it completely and then reflush with a gallon of Restore and then reflush it with Restore+ before flushing it with distilled water and then adding the ELC. It's a long process but well worth it. Is there any white residue around the degas bottle cap?

[il_duramax]

No white residue that I could remember, it has been flushed a few times now prior to this, and I dont remember seeing any either.

Ill let you know sometime tommorow what the readings are.



Oh, by the way only mods to the truck are Bully Dog programmer, air intake system, and exhaust... not that any of that matters though.

[dhanna6powerstroke]

Originally Posted by il_duramax

No white residue that I could remember, it has been flushed a few times now prior to this, and I dont remember seeing any either.

Ill let you know sometime tommorow what the readings are.



Oh, by the way only mods to the truck are Bully Dog programmer, air intake system, and exhaust... not that any of that matters though.

Bully Dog isn't the best option for the 6.0's. If they run it on a pretty low setting it might be ok. I blew mine at 50k running a Banks 6 Gun

[il_duramax]

Fortunately this isnt my vehicle, its a customers.

[dhanna6powerstroke]

Originally Posted by il_duramax

Fortunately this isnt my vehicle, its a customers.

Yeah, I know it is but you might wanna mention it to them.

[il_duramax]

EOT & ECT readings came back normal, less than 15* temp differance.

Customer also requested a new thermostat yesterday so we installed that... and of course, that didnt fix the problem.

Any other idea's?

[Dave]

Pressure test the cooling system