Question about Dodge Cars & Trucks
No cab heat,and plenty of coolant, no smell , and temperature keeps climbing and dropping after noise
If the heater matrix is buried somewhere behind the glovebox, the noise could have been air or combustion gas being pumped through the matrix.
Cylinder head gaskets normally allow small amounts of combustion gas to escape and the cooling system is designed to allow it to rise rapidly above the coolant level, often with additional ports and vent hoses leading to the degassing tank.
If the degassing system becomes blocked due to the cooling system being dirty or corroded the gas bubbles can build up and displace coolant and disrupt the thermostat operation and eventually be forced into the heater matrix causing a vapour lock.
A failing head gasket will have a similar effect...
These things will need checking. Overheating is invariably caused by insufficient coolant circulation and/or insufficient cooling air flow through the radiator.
Posted on May 06, 2017
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Posted on Jan 02, 2017
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