What is your question?
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What is your question?
We have a 2000 ford ranger that overheats then gets cold. the heater does not work until the truck overheats then starts working until it cools off then it overheats again and the heater works again? The gage fluctates from cold to hot the entire time you are driving it. We have replaced the thermostate and flushed the radiator. Are there any other suggestions as to what is wrong and how to fix this problem? Also, It appears to be building pressure and it blows the rad. fluid resevior cap off, that is the only place we can tell where the fluid is comming out.
2 Replies
Your truck may have a blown head gasket. The loss of heater operation is because air is entering the heater core. Many things can contribute to head gasket failure. It is pointless to speculate but you need to get this properly checked out or even more serious engine damage may occur. The most accurate way to test for a blown head gasket on a gasoline engine is to test for the presence of carbon monoxide in the cooling system. Snap-On, Matco (part # CO 2000), and Napa sell a tool to check to carry out this test. Another link to a supplier of this tool is http://www.etoolcart.com/combustion-leak-detector-lis75500.aspx. Carbon Monoxide is only present if there is a blown head gasket or cracked cylinder head. http://www.arrowheadradiator.com/head_gasket_or_combustion_leak_test.htm I think the napa part number 700-1006. http://www.blockchek.com/instructions.htm . Signs of a blown head gasket are coolant loss (frequently have to top up the coolant level of the engine without seeing an obvious leak), experiencing over heating or rough engine running or the presence of white sweet smelling steam from the exhaust. A badly blown head gasket may allow engine coolant and oil to mix.