'10 Dodge Ram heater not hot.

Asked by Sep 15, 2014 at 07:11 AM about the 2010 Dodge Ram 1500 SLT Quad Cab

Question type: Maintenance & Repair

I have a 2010  Dodge Ram 1500.  Air conditioning works great but heater is not blowing hot.  It is the same temp no matter where I turn the dial.  I changed the blend door actuator and it didn't fix anything.  What is my problem?

4 Answers

70

Sounds like the heater core. Do you smell antifreeze inside the truck or is the floor wet on the front passenger side?

No antifreeze smell and no wet floor on passenger side.

70

The thermostat is either open or is missing inside the thermostat housing on the engine

1 of 1 people found this helpful.

There are several possible reasons. First confirm your engine is to operating temperature (170-190 F) by placing your hand or using an infrared thermometer on the upper radiator hose. If using your hand be careful and very momentarily and very lightly touch the upper radiator hose it should feel very hot and uncomfortable. Using an infrared thermometer it should be about 150-190 degrees Fahrenheit (preferred safer method). Then locate two 5/8 to 3/4 inch hoses side-by-side going into your passenger side firewall. These hoses carry hot engine coolant into and back out of your heater core (tiny radiator in your cab). Next touch them (not really recommended...) or using your infrared thermometer make sure they are at the same temperature as your upper radiator hose. If yes, then your heater core is in good working condition and is moving hot engine coolant through it. If one heater core hose is hotter than the other one then your heater core is plugged up and not moving hot engine coolant through it - time to replace it. If both are basically the same temperature then remove your glove box and locate the actuator to left side of the glove box cavity. You will see a white tab behind the actuator. With vehicle running and HVAC system on, rotate temperature control knob from hot to cold and back from cold to hot. You should see the white tab cycle from 6 o'clock (cold) to about 3 o'clock (hot). If the the tab is not moving then remove the blend door actuator and hook it up to your battery (use blue/red wire for negative). If the actuator is in good working condition you will see the actuator's output shaft continue to rotate (slowly). If actuator is rotating while hooked to 12 volts then confirm your temperature blend door is functional by moving the white tab from cold to hot and back from hot to cold. Inspect tab and actuator output shaft for worn splines as well. If all checks out then your most likely problem is your AC or HVAC control module. At this time you will need to refer to a service manual or take it to a qualified repair shop.

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