ArtQ
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I have a 62 BT7 Tri Carb. The radiator was rebuilt about a year ago and two new rows added, it has a 165(or 160) thermostat installed, a flex fan(installed with the rebuilt radiator) and the engine lower end was rebuilt, new brass freeze plugs installed, etc. about 2 years ago. Since the radiator rebuild, the car does not get overly hot (233) except in extreme conditions (stop and go traffic @ 90) and even then the temp drops as it should when traffice clears, etc. I use 50-50 anti-freeze and have kept the coolant at about the same level adding when needed, since the rebuild.
About two weeks ago, I began to have major coolant loss problems only when I drive the car above 4000 - 4500 rpm (70 mph)or run up the revs in lower gears (I do not have overdrive). If I stay under 3500 rpm I do not lose any coolant. If driven at high rpm or speed the car will blow out the overflow tube a gallon or more of coolant. I have had the system checked (chemical and pressure) and I do not have a head gasket problem or cracked block. I assume the thermostat is working properly, because the engine temp reacts up and down as has been normal over the last two years.
The only potential villain that seems to be left is the water pump. Any other ideas????
About two weeks ago, I began to have major coolant loss problems only when I drive the car above 4000 - 4500 rpm (70 mph)or run up the revs in lower gears (I do not have overdrive). If I stay under 3500 rpm I do not lose any coolant. If driven at high rpm or speed the car will blow out the overflow tube a gallon or more of coolant. I have had the system checked (chemical and pressure) and I do not have a head gasket problem or cracked block. I assume the thermostat is working properly, because the engine temp reacts up and down as has been normal over the last two years.
The only potential villain that seems to be left is the water pump. Any other ideas????