No Heat

Causes include:

- air in system
- low coolant
- blocked heater core
- worn water pump impeller and/or failed shaft seal sucking air, etc.
- crimped bypass hose from oil cooler to water pump

Be sure the cooling system is in good health. Cap is working properly...tube to overflow tank not blocked...belt tensioner not beyond service range. Thermostat not stuck open.
 
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