My 97 chevy venture started overheating changed the water pump and thermostat what else can it be?

thermostat is stuck remove the and replace thermostat flush heater core if needed

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might be a faulty water pump not circulating the coolant

Have you replaced the intake manifold gaskets? These engines have a history of leaking intake manifold gaskets. Water leaks into the intake and is burned off in the cylinders. If the engine overheats enough times, you will eventually blow the head gaskets.

Start by performing a compression check to make sure you haven't blown the head gaskets. Then make sure the car is really overheating (i.e. check the temperature of the engine with a infrared thermometer (they are cheap at Harbor Freight).

If it is really overheating, and you've really changed everything else, you need to change the intake manifold gaskets. Be sure to get the improved gaskets from the parts store (they have a metal core with rubber coating).

Change the thermostat and start from there.

You will need to replace your heater core as I bet if you lift up the carpet you will find it damp because thats where you are loosing the fluid. It is undectable unless you lift up the carpet and the foam padding. Also change out your Coolant temperature sensor under the throttlebody. You may also have a bad water pump and or (as you face the the engine) the upper right plastic part of the Radiator may be cracked leaking only when hot.

Never use a stop leak additive especially to the Venture; it has an inferior coolant system. One other item is you may have installed an either overrated temperature or underrated Thermostat causing open and closure issues....The Venture needs the precisely rated Thermostat. Let me know how you fare.

Your water pump may be defective. The impellor may be loose. When the engine is cool, open the rad cap & start the engine. As it heats up & the thermostat opens, look in the rad and see if you have enough circulation of fluid. If not, change the water pump. Check to see if the rad fins are not loose & in good shape. If not, change the rad. Pressure test the rad cap in order to make sure it is holing the proper pressure. Hope this Helps you. Good luck!

There is a heat sensor located near the thermostat that goes directly into the block. Get a Haynes or Chiltons manual.

The thermostat is probably bad and causing your overheating. If that is not hte problem, then it would probably be your water pump.

You should probably replace the temperature sensor first, make sure the car is indeed overheating.

If after replacing the temp sensor, and the problem does exist, then buy a flush kit, and back flush the system, it may be clogged.

Change fuel pump relay.And check the fuses