ok guys..maybe a dumb question..i just installed new heater hoses on my
79..the bottom side of the heater core is a 5/8 hose..the top is a 3/4
hose..i had them routed core to core..and wtaer pump to intake ove the
summer to cut back on the heat during the summer months here in virginia(
for some reason the damn thing would never stop circulating hot
air )..anyways..i hooked the 5/8 to the intake..and the 3/4 to the water
pump..topped the radiator and fired it up..the 3/4 hose collapsed, no hot
air, and the temps went over 200..it was runnin at 150 on the way to the
parts store which is normal for it this time of year..what the hell did i do
suppose there could be..i started the car with the cap off to be able to top
off if needed but hell who knows..lol..i did put the hoses in the right spot
right??..i mean they just dont fit the nipples any other way..i just wanted
to get a lil heat in there now thats its cooling off at night, i aint gonna
stop driving this damn car, its too much fun.lol
Run it with the cap off and bring it to operating temperature, thermostat
open, will normally work. Air pockets in the cooling system can cause head
gaskets to fail. They can be formed while coolant is being added. Air must
escape from the engine as the coolant is added in order to provide even
cooling. The thermostat sometimes blocks the air, leaving pockets in the
upper block and/or heads. In other cases, the configuration of the cooling
system itself makes it difficult to remove air.
With air in the system, coolant does not circulate properly, so the engine
doesn't cool evenly. Air trapped in the system can often be found in the
heater core. Little or no output from the heater when the engine is warm is
a good indicator of air trapped in the system.
First thing I did with my newly rebuilt engine was blow the head gasket
because of an air pocket. The water level in the radiator would suddenly
drop out of sight (idle with cap off). I'd add water and suddenly it would
all come gushing up and out. I trickled water in, I blasted it in, I put it
in the bottom hose and let it run out the top. Finally decided that the
water pump I had put in was a little too good, because it would apparently
create an air pocket just below the thermostat, the pocket would keep the
thermostat from openning until things were incredibly hot, and then it would
open with a vengence. I could hear the pump cavitate sometimes. What a
mess to figure out.
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