99 stratus has water bubbling out of radiator and into reserve tank after only a few miles temp gauge is about half way between cold and hot need to replace water very often.

Does the temp gauge show overheat? If not, then you're not overheating. Possible you have a head gasket problem,which lets combustion gas into the water and can look like boilover.

Water pump may be bad,

Sounds to me like a blown head gasket. Even if your vehicle is not warmed up, if your reserve tank is boiling fluid out of it when the engine is cool, it's most likely losing compression from it all going to your reserve tank. And thats why it's fluids coming out of your reserve tank. BUT, if your radiator is clogged then the same thing could happen. So i would start out cheap before you have to replace a HG. Thanks, James Booth been a mechanic for 6 years

typically that is caused from a bad head gasket, fluid from the engine will be forces through the radiator then boils over or bubbles. As far at the no gauge reading, you probably need a new one.

install a manual guage and forget it.

THEN U MOST LIKELY HAVE A LEAKING HEAD GASKET, VERY COMMON PROBLEM ON THIS V8 NORTHSTAR ENGINE.

where is it leaking from? is it low in water from leaking? there is a hole on top of your water pump if the seals go bad in it thenit will leak water till the piont thatit gets low and cause heating.check for location and let me know.last thing you want to say is blown headgasket

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BEKIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may bepartially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do ahydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BEKIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may bepartially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do ahydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

First thing to check is your coolant level. Make sure you have water or antifreeze i your coolant jug as well as your rediator. If they are both full, there are a couple things that might be wrong, but you will need some mechanical skills to replace them. Check your water pump as well as your thermostat. The Thermostat is located under the upper rediator hose where it connects into the block. The water pump is located directly behind the fan.