hey guys we bought an 01 durango this past summer 5.9 4x4 and has the rear heat. had to replace the water pump almost as soon as we got it home from the dealership but other then that love it. now that it's gotten cold outside we are finding that the heat sucks. the front heat comes and goes somedays it will cook you out of the truck others it's luke warm at best and it never really seems to warm your feet up. the rear heat blows nothing but cold air. so i torn into the rear today and found the common broken stop and broken flap fixed the flap with superglue and some thin wire wrapped around it to reinforce it. then ran a drywall screw thru where the stop broke off. that fix worked great but now i notice that i'm not getting hot water back there at all both lines to the heater core are ice cold. while checking under the hood i found that the hose coming off of the water pump has a Y in it right by the brake booster the line going in is hot and the line going to front heater core is hot but the other leg of it is cold. also on the front heater core both lines at the firewall seem to be about the same temp both being hot. where does the other line off of the Y lead to? also both lines at the waterpump on the passenger side inner fender were hot. does anyone have a diagram of the heater hoses so i can figure out whats going on? this is the wifes truck and she always has the kids in it so i'm hoping that if i can atleast get one of the heaters working 100% we can get by for now

thanks

 

I had an issue similar to this recently but in a caravan, All it was, was the antifreeze was low...My problem was exactly like this!

 

definitely sounds like the system is low an anti-freeze, or has air caught in the system.

 

But...If you would like the diagram, try this site:

http://www.doocu.com/pdf/search/2001...system+diagram

They have a lot of information.

 

just checked the antifreeze again and it is full. yet still that 1 hose is cold it looks like that hose runs under the truck to the rear unit. i replaced the thermostat when i did the water pump and the engine temp gauge always runs just barely above the first line which is still way below the half way point so i put cardboard over half the radiator and still no difference in either the heat or the engine temp. is there somthing special i should have done to bleed air out of the system when i changed the water pump?

 

Im not finding anything that shows a Y at the water pump. I know one of the ports is the Water pump bypass. I have the rear heat as well and I do not have a Y....atleast I'm pretty sure I don't, considering i took the intake off this weekend and completely exposed the water pump, I only saw the by pass and the normal hoses that run to it...

Shrp, could we be looking in the wrong spot? Could it be the resistor pack?

Also, I don't mean to sound like an a** and I am not trying to offend you, because you seem like a very mechanically inclined person, but are you 100% sure you put the thermostat on correctly?

 

mean to attach this to the previous post, directly from the chilton manual

 

if there is a blockage in the rear heater core, or the lines leading to or from the core it would stop the flow and keep the lines from getting hot

however i think you might have gotten a bad t-stat since you said the engine doesnt get all the way up to temp, the stat could be stuck open (or partly open) causing the fluid to constantly flow through the system and cool.

doubt it is a resistor since that controls the HVAC fan speed and that doesnt seem to be this guys problem, if the resistor were bad there would be no fan, or reduced funcitonality of the fan.

 

having a similar heat problem with a 2000 durango, 4.7, only the hoses going in and out of the firewall for the heater core do get hot so i know that coolant is going in and out of the heater core, but the heat gets lukewarm at best, never really gets hot even while driving it, ive replaced the thermostat and same thing is happening, any ideas on what causes this and how to fix it?

 

whit19, your problem is likely a jammed blend door inside the dash