79 heater hoses...

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Larry & Michele - 27 Oct 2005 23:42 GMT

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
wrong???

larry

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Dad - 28 Oct 2005 00:59 GMT

> 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
[quoted text clipped - 8 lines]
>
> larry

Is there an air bubble in the system?

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Larry & Michele - 28 Oct 2005 01:02 GMT

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

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Dad - 28 Oct 2005 01:45 GMT

> 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.

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BDragon - 28 Oct 2005 08:11 GMT

> > 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
[quoted text clipped - 12 lines]
> 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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Larry & Michele - 28 Oct 2005 09:40 GMT

well, to play it safe then im gonna take the thermostat out and drain and
refill the system. Antifreeze is cheap in comparison to head gaskets..lol

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Dad - 28 Oct 2005 14:09 GMT

> well, to play it safe then im gonna take the thermostat out and drain and
> refill the system. Antifreeze is cheap in comparison to head gaskets..lol

No need or advantage to taking it out, just let it idle with the cap off
until all of the air is worked out and it is at running temperature with the
coolant circulating.

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W. Moore - 28 Oct 2005 17:36 GMT

If I remember correctly the thermostat has a top and a bottom. The top (up)
side has a tiny hole with a jiggle valve to let air escape. If installed
upside down you may trap air in the system. (?)

> 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
[quoted text clipped - 8 lines]
>
> larry

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