constant coolant flow to heater core? - Ford Powerstroke Diesel Forum
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Old 06-15-2011, 03:32 PM
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constant coolant flow to heater core?

would this be bad? i have been noticing a coolant smell from under the hood of my truck. i looked and looked and noticed that it seems to be coming from the plastic piece in the coolant line that leads to the heater core. it is opened and closed by a light grey vacuum line when the heater is turned on. i removed this piece and put a piece of straight pipe inline to connect the two ends of the rubber lines. i dont plane on leaving it this way forever but it is 100 degrees down here now so i dont need a heater. is there any down side to having constant flow to the heater core until i replace this part?
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Old 06-15-2011, 03:39 PM
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That is just a vacuum operated valve that some trucks have and some don't (depends on model), it just closes off the coolant flow to allow cooler A/C in the cab.

If you removed the gray line, you should block off the vacuum so you don't have a vacuum leak. Ford was kind enough to put a nipple on the HVAC box for you to block off the gray line. If you look at where you refill you motor oil, behind the oil fill an to the side, on the HVAC box you will see this nipple sticking out. Just plug in the gray line their untill you replace the valve.

Edit: below my finger you will see where it goes if not using the valve.
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Old 06-15-2011, 05:28 PM
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I haven't used the heater in a while and I know its the new coolant coming out because its red. So basically I have just eliminated the valve altogether by putting a piece of pipein there. Ill get a new valve but it wont be for a couple of days. Just want to make sure im not going to hurt anything. I have the grey line plugged for now so there are no vacuum leaks
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Old 06-15-2011, 06:19 PM
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Red coolant?
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Old 06-15-2011, 06:24 PM
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Im running the cat elc. Just did my oil cooler so hopefully this stuff keeps it clear
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