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Changing by-pass hose

70 StangMan

Well-Known Member
Donator
Got rid of the "loop" from manifold to water pump (by-pass heater core) and just capped both off. Lost about 1/2 gal of coolant. What is the best way to replinish without getting a airbubble in the system and having to "burp it" ???
 
Leave the radiator cap off, let the car warm up and watch the level. You do not have to fill it full at first. Just above the core. Let the thermostat cycle open and closed 2-3 times and fill as necessary while the car idles. Let car cool and it should be full. If not, it will just need a top off with no burping.
 
My question is ... why? There's a mechanical reason for the by-pass hose. Why do you feel you don't need it?
 
Make sure that you have good coolant in the heater core before bypassing it. My car had a couple of valves to disconnect it. I did that one summer and when I went to get some heat in the car that fall, I found out that the radiator fluid sitting in the core all summer corroded a small hole in the core that leaked when it pressurized.
 
"mustang656man" said:
i dont believe he is talking about per say "bypass hose" rather the hose used to bypass heater in his car! wes
Exactly, I don't ever plan on using the heater down here and didn't like the hoses laying up on the engine anyway. By-passed with the "loop" and have never been happy with how goofy it looked, so I decided to cap them off. The std. by-pass is intact.
 
Did you use rubber caps? If so, be sure to check the caps you used just as you would the other hoses. I had one on my water pump for nearly 10,000 miles and 18 months. It was holding up real good when I installed the heater. I would just put a steel or brass plug in the intake.
 
"AzPete" said:
Did you use rubber caps? If so, be sure to check the caps you used just as you would the other hoses. I had one on my water pump for nearly 10,000 miles and 18 months. It was holding up real good when I installed the heater. I would just put a steel or brass plug in the intake.
Yes Pete, I used the rubber caps. I remember reading that they do fail rather quickly, but I will keep a eye on them and change accordingly. Thank's for your input.
 
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