No heat below zero temps - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 01-06-2014, 05:24 AM Thread Starter
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No heat below zero temps

I know there a few threads on this nothing that matched exactly. I just did oil cooler egr delete thought that was the problem. Last really cold spell we had truck started puking coolant and heater wouldn't work. Switched out oil cooler and egr delete thought it fixed the problem temps from low of 10 and up these last few days it's been below zero and same problem I ordered a new degas bottle cap not sure if that's it or not. Any ideas
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post #2 of 10 Old 01-06-2014, 07:38 AM
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Is it still blowing out coolant?

Does the heat work when rolling down the highway?

Can you see coolant moving around in coolant tank?

May be thermostat or water pump or even head gaskets. Depending on answers to above questions.


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post #3 of 10 Old 01-06-2014, 09:21 AM Thread Starter
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Heat works at idle it comes and goes at highway speed. I replaced the thermostat this fall. Everything works above like ten degrees.
02 7.3 likes this.
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post #4 of 10 Old 01-08-2014, 05:11 AM
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Bump for a similar problem.....was this fixed or does anyone have further experience?
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post #5 of 10 Old 01-08-2014, 05:23 AM
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Sounds like the problem I had...

New head gaskets and studs fixed that problem!

Probably not the answer you were looking for...

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post #6 of 10 Old 01-08-2014, 05:24 AM
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Air in the system?

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post #7 of 10 Old 01-08-2014, 05:26 AM
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I picked up new heater core in hopes this might be the fix - another member had that work for them due to the bad OEM coolant and silicate build up . It's been single digits all this week around here and having heat for 2 minutes when the thermostat opens doesn't cut it!
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post #8 of 10 Old 01-08-2014, 05:47 AM Thread Starter
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Can anyone explain why in colder temps I get these symptoms and just below freezing it runs fine?
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post #9 of 10 Old 01-08-2014, 06:01 AM
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It could be you have weak anti-freeze and in really cold temperatures your heat exchanger or hoses are blocked. You need to check the flow through the core. You can also test temp of the hose going in and out. You could have a valve that is sticking or not working correctly on the heater core feed (assuming you have one, passenger side near the oil filler). There are other issues, but that is a good start.

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post #10 of 10 Old 01-10-2014, 05:45 AM
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Head gasket leak will cause combustion gases to accumulate in your heater core at idle because it's the high point in your system.
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