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TEST 4: Using A Chemical Block Tester (Combustion Leak Tester)
In some cases the engine runs but overheats and none of the 3 previous tests can confirm (or exonerate) the head gaskets as the problem (causing the overheating).
The test that will definitely help in these cases is a combustion leak test done with a block tester.
You can buy a block tester in just about any auto parts store. In a nutshell, this is how a block tester works:
- A blue liquid chemical, which is blue in color, is placed in the tester (see photo above).
- The tester assembly is then placed on the open radiator neck (you may have to drain some of the coolant in the radiator since this tool needs to 'gulp' some of the air inside the radiator).
- The rubber bellow is then squeezed to suck in the air up through the two fluid-filled chambers. As the air bubbles up through the fluid, it will cause a chemical reaction.
- If the blue chemical turns yellow (for gasoline engines), then combustion gases are entering the radiator. This result confirms a blown head gasket, a cracked block, or a cracked cylinder head issue.
- If the blue chemical doesn't change color, then you can conclude that you don't have a blown head gasket, a cracked block, or a cracked cylinder head issue.
Where can you get the chemical and block tester? At your local auto parts store or here:
20%$10.40
More V8 Dodge Dakota And Durango Tutorials
You can find a complete list of 5.2L and 5.9L Dodge Dakota and Durango tutorials in this index:
Here's a small sample of the tutorials you'll find in the index:
- How To Test The Blower Motor (1997-1999 Dakota, Durango).
- How To Test The Blower Motor Resistor (1997-1999 Dodge Dakota And Durango).
- How To Test The Starter Motor (1997-1999 Dakota).
- How To Test Engine Compression (Chrysler 3.9L, 5.2L, 5.9L) (at: troubleshootmyvehicle.com).
- How To Test The Ignition Coil -No Start Tests (Chrysler 3.9L, 5.2L, 5.9L) (at: troubleshootmyvehicle.com).
If this info saved the day, buy me a beer!
