My 1995 Pontiac Grand Prix SE 3.1 is losing coolant, but it has some symptoms and not...

[Allen Brashears]

My 1995 Pontiac Grand Prix SE 3.1 is losing coolant, but it has some symptoms and not...

...others? It started overheating recently and it never reaches the red, but it fluctuates all the way from 100C (Canadian Car) to right below the Red. I lose coolant and have to keep replacing it. It's clear that it's coming out from below the intake plenum in the back, but no milkshake like oil at all? The oil is clean and fresh. I have steam coming out from somewhere near the water pump but I can't tell where. I also get cold air coming out of the heater until I start revving the engine and then it warms. What's going on?
Any reason why coolant isn't going into the engine oil? I keep seeing everyone describe brown tinted coolant or sludgy oil. I have clean oil.

 

[thebax2006]

You have very little anti freeze left in the system and are overheating your motor. 3.1's are known for intake manifold coolant leaks and are very common. It sounds like you also have a bad water pump seal which seals the pulley shaft. The reason you don't get an accurate temperature reading is because there is no coolant where the temperature sending unit is, there is only an air pocket with steam. You keep driving it that way and revving the motor you will end up with warped cylinder heads or a seized motor.
The only way you get the "milkshake oil" is when there is coolant leaking into the oil from a blown head gasket, you're leaking down the side of the motor, not into it.
Fix the problems before you end up walking!

 

[Shade tree]

Whats rewing? Oh dua! Slap me!

Besides that you answered your own ?

 

[Goatman]

thebax2006 is correct, except you can get a milkshake in the oil from an intake leak when the gaskets deterioate enough but by then you probably have done major damage to the engine get them changed out before it gets to that point , also only use GM gaskets they are specificly designed to seal with low torque pressures aftermarket gasket sets are sometimes not as well designed, if you have no experiance doing them I would have a service tech do it as it is fairly tricky to do correctly..