heater blowing cold - Ford Powerstroke Diesel Forum
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Old 01-07-2014, 03:12 PM
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heater blowing cold

on my 2008 it has EGR delete on it with HS mini max. It started blowing cold air the other day it was -20 with a minus 50 windchill. truck temps were all good. when you give it gas heat blows out again, when I got home checked the degas bottle it was full just about to top didn't puke out. checked heater core hoses were not hot just luke warm. any ideas.
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Old 01-07-2014, 03:19 PM
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Replace the heater core. Also, when you turn the heat on it will sometimes kick the A/C on for a few to clear the moisture out.
Did you get the EOT/ECT readings off the H&S?
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Old 01-08-2014, 10:05 AM
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The ECT was 186 it is usually 192. and the EOT was at 190 which usually runs 198. going to take heater core out. hopefully that is the problem thanks.
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Old 01-11-2014, 08:36 AM
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Got my heater core today decided to let my truck heat up to operating temp and the heater was working like it is suppose to, drove truck over an hour heater worked great heater hoses were hot coolant fluid was where it usually is. Could it have been a airlock in hose somewhere or should I go ahead and install heater core.
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Old 01-11-2014, 10:27 AM
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It's just hard to believe that a newer truck like that has a bad heater core. You originally posted this during the nation's coldest temperatures in 20 years. My 97's heater wasn't that hot during that either. But our 08 has 150,000 miles and the heat still works great. Since the heat works fine, I wouldn't change the heater core yet. There could've been some frozen or airlocked lines and that was the problem. Heater cores only run for about $50 so I would just leave it laying around in case it does go bad.
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Old 01-11-2014, 01:31 PM
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I didn't change working good, the heater core cost $95 I will hold on to. My 2003 6.0 diesel worked great the hold time, I had new coolant in 6.4 when I did the delete to it so it's just crazy to me. but thanks for your in put.
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Old 01-11-2014, 02:03 PM
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No problem man. And $95 is highway robbery.
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Old 01-11-2014, 03:56 PM
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My 08 did the exact same thing last year when it was below zero out. Needed new heater core and thermostat, extended warranty covered it and worked fine ever since.
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