replaced water pump
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New User
Joined: Oct 2006
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replaced water pump
I just replaced the water pump on my 1986 F150, 300.
(Thanx to all the guys who gave me tips ).
When i refilled it with coolant it would only take about 2/3 of what I took out.
I assumed it was just an airlock so I let it idle awhile but all the pressure stayed up top.
Could this be aproblem with the thermostat?
(Thanx to all the guys who gave me tips ).
When i refilled it with coolant it would only take about 2/3 of what I took out.
I assumed it was just an airlock so I let it idle awhile but all the pressure stayed up top.
Could this be aproblem with the thermostat?
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
When you fill it, the thermostat is closed, so it blocks some of the water from getting through. I usually squeeze the hose to "burp" it effectively drawing in some water while squeezing air out. Since you have run it some, you may be able to get some more in.
Cargo Master
Joined: Apr 2003
Posts: 2,408
Likes: 6
From: Parkesburg PA
I don't know if it applies to you, but I like to drill a small hole in the thermostat to let the air come out. 1/16" is all you need, but I usually use an 1/8" bit. Some say it lets the motor run cooler, but I don't buy that... May make it take a little longer to heatup though.
Also I run the car / truck first with the cap off so you can add coolant as it drops off, and you'll know exactly when the t-stat opens up.
Also I run the car / truck first with the cap off so you can add coolant as it drops off, and you'll know exactly when the t-stat opens up.
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