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Old 11-23-2010, 08:19 PM
cooter05 cooter05 is offline
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05 6.0 heater blowing cold air

My 05 is blowing cold air out of heater after it is warmed up. At an idle it blows hot but after you drive a few minutes it blows cold. Under accel it will also cool right off. Today driving home in the bitter cold, cruising on hiway, blowing ice cold I pulled over to check heater hoses. Ice Cold, yet temp gauge normal, degas normal no venting. HG's changed with studs, EGR cooler checked, new cooler, new injectors. Ongoing now for a couple years. No summer heating issues. Very Confused. Help. Could it be thermostat?
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Old 11-23-2010, 09:06 PM
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Quote:
Originally Posted by cooter05 View Post
My 05 is blowing cold air out of heater after it is warmed up. At an idle it blows hot but after you drive a few minutes it blows cold. Under accel it will also cool right off. Today driving home in the bitter cold, cruising on hiway, blowing ice cold I pulled over to check heater hoses. Ice Cold, yet temp gauge normal, degas normal no venting. HG's changed with studs, EGR cooler checked, new cooler, new injectors. Ongoing now for a couple years. No summer heating issues. Very Confused. Help. Could it be thermostat?
Maybe your heater core is bad.
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Old 11-23-2010, 09:12 PM
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Gauges have a lot of range in temp. without moving..This happened a couple yrs. ago in one of our ambulances. The thermostat was stuck open. Replaced and all was well...
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Old 11-23-2010, 09:24 PM
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A ODBII reader (ie: scangauge2, insight, etc.) can give you the actual
temp. The dash gauge is a very crude device 100 or 180 reads pretty
much the same thing.

If you could read the coolant temp you'd find a bad thermostat
because the temp would be below 190 once warmed up.
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Old 11-23-2010, 10:22 PM
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Thanks guys, I'm gonna try the t-stat on the weekend.
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Old 11-23-2010, 10:27 PM
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My vote is stuck open t-stat or blend-door faulty (I'm not sure if the blend-door is vacuum driven or mechanical). How does your top rad hose feel (hot/cool....solid/colapsed)?
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Old 11-24-2010, 08:54 AM
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Also check the vacum line on the heater control valve. They are known to get knocked off or leak vacum. Gray vacum line near the add oil spout.
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Old 11-24-2010, 10:27 AM
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That happend to me. turns out i was low on antifreeze. check it you might just be low.
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Old 11-25-2010, 08:56 PM
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Smile

Changed the t-stat tonite and now hot as he**. Thanks for all the help.
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Old 11-25-2010, 10:47 PM
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Changed the t-stat tonite and now hot as he**. Thanks for all the help.
Great to hear.. Especially with winter coming on strong this year....
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Old 02-14-2014, 09:10 AM
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Hey guys I'm having issue with cold air just replaced t stat didn't change nothing..when I turn heater off of change to ac that heater control valves stays open what can I do to fix it...thanks
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Old 02-14-2014, 10:54 AM
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Could be a vacuum leak. Check heater control on heater hose above passenger side valve cover. See if you can move the lever by hand. Watch the control while an assistant turns on the heater to see if it moves and check the gray vacuum line with a vacuum gauge.if your not getting hot air the control is probably staying closed,I'd wire it open until the weather warms up and tackle it then.
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Old 02-26-2014, 09:10 PM
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Mine is blowing cold air only at idle. Any throttle setting above idle produces the proper heat. Vacuum issue?
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Old 02-26-2014, 10:31 PM
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Check vacuum pump, as well???
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Old 02-26-2014, 11:13 PM
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Quote:
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Mine is blowing cold air only at idle. Any throttle setting above idle produces the proper heat. Vacuum issue?
Yours doesnt sound like a vacuum problem to me. Check coolant level, possible reasons for yours is water pump impeller is broke, thermostat, blocked heater core, head gaskets.
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Old 02-26-2014, 11:13 PM
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