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Freezing in my 2002 Dodge Ram - more info

A

Anonymous-0

Well-known Member
First, thanks for all of the suggestions. This is a 2002 1/2 ton pickup with a 4.3 engine. I do not have dual temperature control. Today will driving, I turned the heating selector knob to throw the air outward from the dash rather than onto the floor. I also turned the fan to low. When the temperature knob is turned to the cooler position, really cold air comes from the dash vents when you put your hand at the outlet. Then when I turn the temperature knob to hot the air from the vents actually gets warmer, again by feeling with your hand. Just not warm enough to heat up the cab. Wouldn't this indicate that the blending door is probably working since it gets really cold and then luke warm??? If so, does this leave the heater core as the main problem? I have never had heater core problems with any other vehicles in my life. What makes Dodge Rams have this problem?? Can it be back flushed to make it work??? Maybe with some cleaners and the force of a garden hose?? All of you guys are really helpful. Thanks. andy
 
Did you feel the heater hoses??????? Sounds like your blender door is attached to the cable but is not moving as it should.

Dave
 
Dad had a Ford that had a crosstube installed in the heater hose circuit, near the firewall.
The dealer said it was a factory fix for the heater core air locking.
Crosstube looked like the letter H as in Harold.
 
Had problem with a lack of heat with my Ford Ranger. I think a shop put radiator stop leak in the system. Anyway, had to have a new heater core to fix the problem.
 
it still can be the blender door. heater core is only 50.00 and to change it is about 5 hr. did one today in about 4 and also changed out the door used a tin one from the guy in Texas heat like hel- now
 
I remember my first car... When the heater stopped working, it was a sure sign of the coolant level being too low. This usually happens where the heater core is the highest component in the whole cooling system of a car.

Now some theory. If the cab heater is turned on, engine being at operating temperature, BOTH feeder line and return line of the cab heater core should be hot (the feeder hotter than the return). If both lines remain cold or feel just luke warm, something it that circuit is blocked. Could be a plugged core or hose. Or a kinked hose or ... Remember, to transfer/transport heat from your engine to your heater core, the coolant must FLOW.
Hope this helps, Hendrik
 
Our ol 96 does the same thing.

We used it to haul tractors.

We put in all that stuff mentioned,, even a new heater core, nothing actually helped.

The engine does not get above 150 degrees!! it has a 195 thermostat in it,,,,,,,,

We had put in a new radiator, new water pump, thermostat, hoses, heater core, the flapper door, etc etc! Now, it is overcooling!

I had to put cardboard infront of the radiator, blocked off 70% of it,, now it gets up to 180 degrees, but its warmer in there. LOL.
 
Try reversing the hoses at the heater core inlets where they meet the firewall and see if it makes a difference. Your core may be clogged or clogging and reversing the flow (hoses) may break some of it away and get you some heat. That"s what I did to my "96 and it made a difference, which means that I have to replace the core, and thats going to be fun, but at least now I have warm air that defrosts the windshield and is liveable at the global warming 9 degrees we"ve been having by me.

Give it a shot. Will take you 5 minutes to do.

Mark
 
Feel your heater hoses that's been mentioned. If they're not hot you have blockage probably in the heater core. My late father-in-law had that problem on an old Ford car and his heater core was blocked and they said it was from him not changing his permanent antifreeze. It will lose the rust inhibitor over time. Hal
 
Probably someone pulled a cheap charlie fixit on it and instead of fixing leaking components, used a snake oil radiator stop leak product on it. Folks like to brag about getting by with using stop leak products but later they cry when the heater core blocks up, or the engine overheats because the radiator core is all gummed up.

Also everyone keeps asking you and you still have not really snswered them: Did you feel BOTH hoses to the heater core to see if they were both hot?? One should be a little hotter than the other one, but both should be hot at normal engine temp.

Tom
 
My Dodge Caravan van had a problem with no heat. A fix i learned about was this:
In the left lower of the tin heater box, as seen inside under the dash, drill a small hole, and squirt in a healthy dose of WED-40, or an equal, while working the lever that moves the door in the box. You won't be near the core.
Also, on some of the cars i have owned, i would bleed the heater this way. I'd fill the radiator, then loosen the clamp on the higher heater hose, have somebody race the engine some, then pull off the upper hose, allowing some coolant, and air, to gush out, then push the hose back on and tighten the clamp!
 
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