Truck not heating well

davbell22602

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2004 f350 5.4l doesnt heat when temperatures drop below 40 degrees. Truck has no cabin filter.

Co worker said it could be a water pump and thermostat.

What do you guys think on what it is?

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OldCracker29

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2004 f350 5.4l doesnt heat when temperatures drop below 40 degrees. Truck has no cabin filter.

Co worker said it could be a water pump and thermostat.

What do you guys think on what it is?

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It could be low on coolant as well.
 

PenguinLTZ

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Thermostat is very likely, but when was the last time the coolant was flushed? Coolant starts to drop out solids when it is old, or mixed improperly. The congealed solids collect in the heater core, radiator, etc.
Coolant is often the most overlooked maintenance item in every truck.
If it were me, and I had a 17 year old truck north of 100K, it would get a really good flush, with a 2 part chemical, a water pump, and a thermostat. If it was my daily driver, the hoses would get replaced, too.
 

davbell22602

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Thermostat is very likely, but when was the last time the coolant was flushed? Coolant starts to drop out solids when it is old, or mixed improperly. The congealed solids collect in the heater core, radiator, etc.
Coolant is often the most overlooked maintenance item in every truck.
If it were me, and I had a 17 year old truck north of 100K, it would get a really good flush, with a 2 part chemical, a water pump, and a thermostat. If it was my daily driver, the hoses would get replaced, too.

Ok thanks. Truck has 201k miles.

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Black02Silverado

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Thermostat is very likely, but when was the last time the coolant was flushed? Coolant starts to drop out solids when it is old, or mixed improperly. The congealed solids collect in the heater core, radiator, etc.
Coolant is often the most overlooked maintenance item in every truck.
If it were me, and I had a 17 year old truck north of 100K, it would get a really good flush, with a 2 part chemical, a water pump, and a thermostat. If it was my daily driver, the hoses would get replaced, too.
Very good info. The other item that gets overlooked is the power steering fluid and differential fluid.
 

davbell22602

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Update

Replaced water pump, fan clutch, tstat, blend door actuator switch, and flushed radiator 3 times. Now no heat while driving but have heat when idling for 10min or longer. Heater core and radiator is left to be replaced. Truck not equipped with the heater valve.

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