Grand Prix is overheating - no coolant cycling
 

You probably are air bound, there should be a bleeder port on the thermo
housing, you must add coolant till the coolant flows freely out of that
port. There may be another one on the coolant pipe other end of engine.
"it's a gusher" > wrote in message
...
> Hi, we have a 92 Pontiac Grand Prix with a 3.1, 6 cylinder, auto, a/c.
> The water pump made a worn bearing sound, leaked coolant and showed
> high temperature at the panel. Today I replaced the pump but the car
> still overheats in about 5 minutes of idling. About 230 degrees, the
> fans come on and I turn the engine off. The heater puts out tepid air
> and the radiator is not hot. The radiator send and return lines are
> slack for most of the test but get full and hot the last minute or so.
> The radiator cap is screwed on with the arrows the correct way and the
> plastic reservoir is at the correct level. I thought it was a stuck
> thermostat so I removed it but still no cycling. I thought the
> radiator was plugged so I ran a garden hose through it both ways. I
> flushed the block both ways and filled the block and radiator with
> water.
> With the radiator return line removed at the thermostat housing, where
> it screws into the block I can run the engine and see there is no
> water being pumped out. It should show something even without the
> system pressurized shouldn't it? The only thing that got the system
> cycling was to loosen the radiator cap. That showed a small amount of
> water spilling out the thermostat housing.
> With the fluid levels normal and the system back to normal I could
> loosen the radiator cap and the car stays at about 120 degrees and
> idles fine but the "low coolant" light comes on- due to lack of
> pressure, I guess. I think 180 is normal but I'm not sure. If I close
> the cap it cooks up in a mater of minutes. Please send help. This is a
> friends only car and she can't afford to take it to a real mechanic.
> Thank you.



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Air trap, perhaps?

On Thu, 16 Jun 2005 00:14:35 GMT, it's a gusher >
wrote:

>Hi, we have a 92 Pontiac Grand Prix with a 3.1, 6 cylinder, auto, a/c.
>The water pump made a worn bearing sound, leaked coolant and showed
>high temperature at the panel. Today I replaced the pump but the car
>still overheats in about 5 minutes of idling.

Since you pulled the thermostat and did the hose test we can assume
their isn't a blockage. Are you sure you have the right water pump
and that the impeller is firmly attached to the shaft? It almost
sounds like your impeller is loose so you aren't getting any water
flow.

Steve B.

"Steve B." wrote

> >Hi, we have a 92 Pontiac Grand Prix with a 3.1, 6 cylinder, auto, a/c.
> >The water pump made a worn bearing sound, leaked coolant and showed
> >high temperature at the panel. Today I replaced the pump but the car
> >still overheats in about 5 minutes of idling.
>
> Since you pulled the thermostat and did the hose test we can assume
> their isn't a blockage. Are you sure you have the right water pump
> and that the impeller is firmly attached to the shaft? It almost
> sounds like your impeller is loose so you aren't getting any water
> flow.

Maybe the old impeller disintegrated and the pieces are blocking the water
passages from the pump? Or was it Ford pumps that did that?

pull the t stat and see if it flows then.

You didn't put the belt on wrong did you? I've seen it happen with this
engine--the pulley is run off the back side (smooth side) of the belt.
Of course it is possible to have air in the system cause these symptoms
as well.