1995 Chevy Corsica cool heat...

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30W - 23 Dec 2005 23:23 GMT

Hello I have a 4 cylinder 1995 Chevy Corsica which blows out cool air.
I checked my heater core its not leaking and I flushed it to make sure
coolant can flow thru easily and no problems there. I changed the
thermostat with no luck. But today I noticed that my upper radiator
hose is soft I can squeeze it together while the engine is running. I
assume no pressure is building up in my system. I tested my overflow
tanks cap and my system for 15psi and no leaks. SO my question is what
builds up the pressure in the engine? Does the water pump bring the
pressure up?

TIA for any help!

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Woody - 24 Dec 2005 01:04 GMT

It is pressurized by expansion of the water when it gets hot. The hose isn't
necessarily going to feel hard as it is only 15 pounds and when you squeeze
it you push antifreeze into the expansion tank through the pressure release
valve. Is the radiator full? Is the water getting hot? do the hoses to the
heater core feel hot when the engine is warmed up?

> Hello I have a 4 cylinder 1995 Chevy Corsica which blows out cool air.
> I checked my heater core its not leaking and I flushed it to make sure
[quoted text clipped - 7 lines]
>
> TIA for any help!

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30W - 24 Dec 2005 17:21 GMT

I cant tell if the radiators full because there in no cap on it. My
system gets filled thru the overflow tank. Yes the hoses do get hot to
the thermostat and the thermostat does open. I've ran the car to
operating temp with the cap off to burp it to release any air.

Thanks

> Is the radiator full? Is the water getting hot? do the hoses to the
>heater core feel hot when the engine is warmed up?

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=AB Paul =BB - 24 Dec 2005 02:33 GMT

> Hello I have a 4 cylinder 1995 Chevy Corsica which blows out cool air.
> I checked my heater core its not leaking and I flushed it to make sure
[quoted text clipped - 7 lines]
>
> TIA for any help!

Basic physics:
Things expand when they get hot and they shrink when they get cold.
A system at ambient temp should have no pressure.
Throw a sealed can in the fire and it will explode from
pressure build up.

Does your engine heat up at all?

A couple of things come to mind:
1) The thermostat is bad.
2) There is a lot of air in the system.

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30W - 24 Dec 2005 17:27 GMT

The engine does heat up. The upper radiator hose gets hot where i can
only touch it for a couple of seconds before I have to pull my hand
away. The radiator also gets hot. I changed the thermostat twice
already and no luck =\. I burped the system to release any air but
maybe there is still more air. I dont believe my system has a bleeder
to release any air. You have any suggestions for releasing the air?
The way I did it was run the car to operating temp with the cap off, I
also squeezed the upper raditor hose to force any air out.

Thanks

On Sat, 24 Dec 2005 02:33:16 GMT, "« Paul »" <" « Paul
»"@houston.rr.com> wrote:

>Basic physics:
>Things expand when they get hot and they shrink when they get cold.
[quoted text clipped - 7 lines]
>1) The thermostat is bad.
>2) There is a lot of air in the system.

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=AB Paul =BB - 24 Dec 2005 17:55 GMT

> The engine does heat up. The upper radiator hose gets hot where i can
> only touch it for a couple of seconds before I have to pull my hand
[quoted text clipped - 6 lines]
>
> Thanks

The upper hose is discharge into the radiator. If it is hot then odds
are the thermostat is working correctly. The heater core bypasses the
thermostat.
With me not knowing the history of the car...
1) Are you sure the heater hoses are not on backwards?
2) There could be air in the system - heater core especially.
There should be an air bleeder near the top of the engine.

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The Adams Family - 25 Dec 2005 13:49 GMT

Did we ever determine whether the hoses to the heater core get hot. If
everything else warms up maybe the valve that lets the water into the heater
core doesn't work. Some of the older cars used a vacuum operated valve,
maybe that valve isn't working.

> Hello I have a 4 cylinder 1995 Chevy Corsica which blows out cool air.
> I checked my heater core its not leaking and I flushed it to make sure
[quoted text clipped - 7 lines]
>
> TIA for any help!

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