Question about 1991 Mazda 626
The car is over heating and the rpms goes up and down while in parking as well as it cant hold the water. whats wrong?
You have a leak somewhere, and a small one it soulds like, also with the runniong rough, it sounds like you might ave head gaskets going out, i would get a compression check on the cylenders, check the oil and water for any cross mixtuer, likr oil in the water and water in the oil, if there is in the oiol it will look light brown and thick, in the water you will see oil bubbles in the radiator
Posted on Jun 18, 2009
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Posted on Jan 02, 2017
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When you put thermostat in did you put spring side towards the engine? Did you get the air pockets out? Do both upper and lower radiator hoses get hot? If both radiator hoses get hot then you got out the air pockets. Does the cooling fan kick on? Is the air deflector still on the car. The next step is to check for blown head gasket. Get the engine hot make sure both radiator hoses are hot and antifreeze is filled to the top hold rpms around 20 to 25 grand and watch for air bubbles. If there is air bubbles and the antifreeze doesn't go down that a good chance of head gasket. I the antifreeze goes down that just air pockets coming out. If you not sure or want to double check after making sure your system is fuel of antifreeze and let engine get cold. Then start car and run 20 to 25 hundred rpms and watch for air bubbles. This sometimes is easier because you're not dealing with that hot antifreeze. They also make what they call a block tester if you want to spend more money. They work but I'm not that thrilled about them. The best way is with an exhaust analyzer also known as emission machine to test for HC in the cooling system. Just be very careful if antifreeze goes up the probe it will damage the machine. If you run through all this checks you should find what is causing the problem. Opps I forgot the temp gauge and or temp light may not be right but if your also steaming it's not them.
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