Vaccum Question
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Joined: Feb 2003
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From: Southern Utah
Vaccum Question
I have a 400 in my 1978 F150 that has two vaccum hook ups coming off of the thermostat housing. What do these do and are they necessary for proper vaccum function? They were hooked up when I took the housing off but they need to be replaced if they are something that I need to make sure it is operating correctly since they look original and are very corroded. Thanks for the help.
Dett
Dett
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Junior User
Joined: Feb 2003
Posts: 63
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From: Southern Utah
Vaccum Question
Do I need to worry about replacing them? They are hooked up but I don't know if they are working or not since they are awfully corroded. I am not sure if I have EGR on my manifold or not. I do have a vaccum line that goes into the front right side of the manifold.
Thanks, Dett
Thanks, Dett
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Joined: Aug 2000
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From: PacNW
Vaccum Question
Well, the answer depends on whether or not you have the EGR system hooked up. If you do then you should replace them (there are 2 valves, 1 for sensing when the engine is warmed up and another for sensing when it's overheating). If you don't have the EGR hooked up then they aren't doing anything. If you do disconnect them then you'll have to trace the line back to the vacuum sorce and plug it to prevent a vacuum leak.
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Dett
1973 - 1979 F-100 & Larger F-Series Trucks
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Feb 9, 2003 11:06 PM
