I picked up a 2002 dodge ram 1500 4.7 to use as a plow truck but it has no heat. This is what I have done so far I have flushed the system replaced the heater core (old one was leaking) checked all the blend doors while I had the heater box out. I also replaced the thermostat twice. I have tried running the truck with the radiator cap off and the front end elevated. I get a very little heat from the vents. I have also noted that when I rev the motor up to 5,000 rpm the temp gauge goes from the middle to the cold end. I get a little heat at that point. When I leave the car overnight the next day when I start it up no heat again no matter how long I run it. I also noticed that the lower radiator hose stays cooler than the upper hose. Do I have a clogged radiator what else could it be water pump maybe. I am tired of tossing parts at this thing I would like some direction from here.
Do you live in an extremely cold region? If so, those folks usually have a problem with heater in winter time. With a fully warmed up engine, how hot does it get in degrees F? Are the heater hoses hot?
SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat
Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.
SOURCE: 2000 Dodge Ram Heat not hot, only luke warm @ idle
did you use pure antifreeze if so remove it all and add a 50/50 mixture because antifreeze will not heat up good if its pure. needs water to allow good heat.
SOURCE: Heat troubles..92 dodge caravan 3.3L..new
If it is fogging your windows, you have a leaking heater core. Dash removal is required to fix it.
Testimonial: "great advice,,but I am not losing antifreeze from my cooling system,"
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