Heater hose replacement on a 67 Camaro - Team Camaro Tech
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post #1 of 3 (permalink) Old Feb 19th, 12, 10:33 AM Thread Starter
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Greg
 
Join Date: May 2009
Location: Stockbridge, GA
Posts: 73
Heater hose replacement on a 67 Camaro

I am only replacing the heater hoses. The old ones are worn out. Is it necessary to drain the radiator to do this? I have heard yes and no.

Thanks.
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post #2 of 3 (permalink) Old Feb 19th, 12, 11:21 AM
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Join Date: May 2004
Location: Southeast PA
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Re: Heater hosereplacement on a 67 Camaro

In an open system, the coolant will try to reach a level even with the lowest point open to the atmosphere. So, if the level in the radiator is higher than the lowest point you will be opening up, then you will be discharging from that lower point.

In other words, because the heater hose nipples on the intake and water pump are lower than the level in the radiator (assuming you have it filled within 2 or 3 inches of the top of the rad, as recommended for an open system), you will get coolant gushing from both of those when the heater hose is removed.

If you drain the level in the rad down below the lowest point, then no gush. So, you do not need to drain completely, but at least some.

Eric
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!
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post #3 of 3 (permalink) Old Feb 19th, 12, 12:45 PM Thread Starter
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Greg
 
Join Date: May 2009
Location: Stockbridge, GA
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Re: Heater hose replacement on a 67 Camaro

Thanks for the reply/explanation. Your explanation makes perfect sense. Off to get some anti freeze.
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