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mhodge66
mhodge66 1/24/2013
1999 Dodge Ram 1500 Base 8Cyl5.2L - Engine
No heat!! Was blowing warm for a little then would just get cold! But now it's just blowing straight cold??
Heater switch only works on max and defrost?
1 Answer
  • CVO
    CVO 1/24/2013
    The blower motor relay controlled the highest speed. Replace the blower motor resistor for the other speeds.

    Insufficient coolant , trapped air in the cooling system might not have enough coolant to full fill the heater core.

    The hot coolant flows from the engine to the heater core through the "inlet" hose. After circulating through the core, the coolant returns to the water pump through the "outlet" or "return" hose. Both the inlet and outlet return hoses should feel hot when the engine is at normal operating temperature and the heater is on.

    1. If the both heater core hoses were cooled, then this vehicle might have an insufficient coolant in the cooling system.
    2. If the heater core inlet hose is hot and the outlet hose is cool, the heater core might be clogged.

    Note: check the radiator coolant level and top it off as needed.
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