You may have a blown head gasket. 1st check to see if your coolant level is good, if it isnt make sure you top it off, run it for 20 minutes watching the temp. and putting the heater control to full hot to be sure you bleed out all the air that may be in the system, after 20 min or when the temp rises too hight turn it off, let it cool, open and top off as needed, repeat after topping off, do this till it no longer takes any more coolant and is no longer overheating. If your still overheating and slowly losing coolant you more than likely have a blown head gasket, they have a sniffer test you can do at the radiator cap your local parts store carries them or your local mechanic can run the test.
SOURCE: overheating
1. start the engine and leave the radiator cap open.
2. put a cardboard cover or a rug in the front of you radiator.
3. let it runs 20 minutes or more, see if it is overheated and see the water or coolant in the radiator circulated or not. If not, as soon as you have already changed water pump. thermostate and check the hoses, no leak, I think your radiator was blocked.
Did you put stop leak before?
SOURCE: ford ranger truck overheating
I have had this happen with my ranger. Changed everything I could to try to fix the over heating. It turned out that I had a small leak in my head gasket and it was allowing exsaust gas to go into the cooling system witch was over pressurizing it. Also the air from the exsaust will heat up much faster than liquid making your thermostat to read hot and will not be able to blow hot air in the cab because there is no liquid going to the heater core. This happened to me when my blet came off and I tryed to make it home. If you had it over heat for a long peirod of time it may have ripped the head gasket.
SOURCE: 1997 bmw z3 conv. 1.9 overheated, changed
hi jasso, I would recommend checking the water pump if you see no flow in the radiator. Make sure when you fill up the cooling system, that you fill it cold, and that the vent screw in the radiator is loose. fill system until fluid comes out the vent screw. tighten the screw, start the car and have someone run at 1500rpm and check for flow.also, make sure that you have your temp setting full hot and blower on middle speed so that you don't trap air in the heater core.
SOURCE: 1990 toyota corolla wagon 1.6 liter 5 spd. overheating
you've got a possible blockage in the head or block.
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