6.0 No Heat under load... :/ - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 13 (permalink) Old 02-20-2015, 02:41 AM Thread Starter
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6.0 No Heat under load... :/

Ok, so just recently i will loose heat after building roughly 25lbs of boot for 5 seconds or more. Once i let off it will continue to blow cold air for 20 or so seconds then the heat will come back. The heat will come back at any rpm as long a boost is below ~25. It is middle of winter here in PA, and lately it has been cold. -7 degrees without windchill at night with highs in the teens. The coolant temp hovers around 168-173. Oil temp 95% of the time is within +10 degrees. if it does go over it is not by more then 15. Then cools down quickly to less then 10 above. This is all without hauling anything (Other then hauling a$$.) lol. Any ideas? i am hoping it is not headgaskets as i am not losing any coolant that i can tell. Just losing heat underload. Heat works fine at idle also.

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2006 F350 6.0
SCT - inovative diesel Extreme Street Tune
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post #2 of 13 (permalink) Old 02-20-2015, 05:26 AM
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Re: 6.0 No Heat under load... :/

That definitely sounds odd to me! I honestly have no clue what might cause that, but my mind still wants to try to help diagnose. So......why not use a zip tie and tie the heater shutoff valve to the full open position then drive it to see what happens when you go over 25PSI. I figure the three main possibilities are no coolant in heater core (for whatever reason), No coolant flow so the existing coolant in core quickly cools off, or the temperature vane in the heater box is moving over to the cold side. You could check the thing with a passenger looking at the temp vane when driving, or open the box access panel and feeling the core to see what's going on, but figured my method might at least help eliminate one of those possibilities so you could focus on the other two.
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post #3 of 13 (permalink) Old 02-20-2015, 12:03 PM
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Re: 6.0 No Heat under load... :/

The probability you are lifting a head is very high with your symptoms. What happens is the combustion gas will aerate the cooling system causing you lack of heat. Once the air "bleeds" out of the heater core, you have heat again.

Where are you located?

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post #4 of 13 (permalink) Old 02-20-2015, 07:49 PM Thread Starter
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Re: 6.0 No Heat under load... :/

I noticed today now i had no heat while at idle. I will do some more digging this weekend. Thanks for the ideas! Ill do the zip tie test on the valve and also see if i can rig up a pressure gauge on the degaus bottle. Ill follow up with my results later this weekend.

matthewd11: I am located in Lebanon, PA
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post #5 of 13 (permalink) Old 02-20-2015, 09:15 PM
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Re: 6.0 No Heat under load... :/

Am I reading that right? Your running an extreme street tune on stock head bolts?
I'm afraid to say that Matthewd11 is probably spot on.
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post #6 of 13 (permalink) Old 02-20-2015, 11:29 PM
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Re: 6.0 No Heat under load... :/

Yup, you have a blown headgasket, sorry bud. Once you do that pressure test i'm sure you'll find your answer.

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post #7 of 13 (permalink) Old 02-20-2015, 11:57 PM
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Re: 6.0 No Heat under load... :/

It could be just coincidence that it happens above 25psi. I had surging heat in mine during the winter and it ended up being the water pump. The 6.0s have a cheap plastic impeller and it will crack around the shaft and slip! I would change the thermostat if you get into draining the coolant system. I would think that if you had a blown head gasket that it would compress your coolant system and cause it to overheat. Just sharing my experience! good luck!

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post #8 of 13 (permalink) Old 02-21-2015, 12:51 AM
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Re: 6.0 No Heat under load... :/

6.0s dont always overheat with head failure. They simply 'lift' the heads under a load due to insufficient clamping force by the POS head bolts. Every head gasket failure is not the same. If he has heat at all, at any point, the water pump is working. He said the heat is intermittent. A water pump does not work intermittently.

From working on these day and day out, this is classic 6.0 head gasket failure.

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post #9 of 13 (permalink) Old 02-21-2015, 02:43 AM Thread Starter
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Re: 6.0 No Heat under load... :/

On my way home today i stopped and looked at the degas bottle. The brake master cylinder was wet with coolant and there was coolant on top of the brake line proportioner(if that is what that is). The degas bottle itself where the cap is was not wet at all and there was virtually no white crud. There is some on the side at the back of the bottle. I didn't get to look at it closely yet because its so darn cold out. I am thinking the degas bottle may be leaking or the hose on the bottom is leaking a little? Hopefully tomorrow i can get the truck in a buddy's garage to check things out.
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post #10 of 13 (permalink) Old 02-21-2015, 02:46 AM
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Re: 6.0 No Heat under load... :/

Quote:
Originally Posted by bigriggs22 View Post
On my way home today i stopped and looked at the degas bottle. The brake master cylinder was wet with coolant and there was coolant on top of the brake line proportioner(if that is what that is). The degas bottle itself where the cap is was not wet at all and there was virtually no white crud. There is some on the side at the back of the bottle. I didn't get to look at it closely yet because its so darn cold out. I am thinking the degas bottle may be leaking or the hose on the bottom is leaking a little? Hopefully tomorrow i can get the truck in a buddy's garage to check things out.
They commonly crack near the bottom hose outlet


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