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Old 03-16-2013, 06:30 AM
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no heat

hey guys my 04 6.0 has no heat while driving and at idle coolant levels are the same and do not change.

i just changed the water pump last week and did not change anything still the same with no heat. i did check the lines to the heater core one line hot and the other is cold. does that mean that the heater core is clogged? also will a flush with vc-9 help?

also how can i verify that my blend door is operating correctly? when i was checking the heater core line i playing the controls and it seemed to work i saw the actuator arm moving. not sure if that is the correct to know if its working or not.

Last edited by UserError; 03-16-2013 at 06:35 AM.
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Old 03-16-2013, 08:24 AM
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The vacuum line that controls the flow to the heater core could have came off. Follow the heater hose, there is a control valve. There should be a vacuum line attached to it. This shuts off the the flow when the air condition is on. With out vacuum the valve won't open to allow heat to the heater core.
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Old 03-16-2013, 08:49 AM
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How much coolant came out? Only reason is when I did some work to my truck the heater didn't want to work until I worked some air out of the system. Probably doesn't happen a lot or I did not so something right.
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Old 03-16-2013, 09:03 AM
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Quote:
Originally Posted by bigmic View Post
The vacuum line that controls the flow to the heater core could have came off. Follow the heater hose, there is a control valve. There should be a vacuum line attached to it. This shuts off the the flow when the air condition is on. With out vacuum the valve won't open to allow heat to the heater core.
ok i'll look into that. if the control valve is bad would cause the one line to be hot on the heater core and the other line to be cold?


Quote:
Originally Posted by joshoke View Post
How much coolant came out? Only reason is when I did some work to my truck the heater didn't want to work until I worked some air out of the system. Probably doesn't happen a lot or I did not so something right.
i used a air lift to create a vacuum in the cooling system. i think 3 1/2 gallon came out.
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