Jeeprat

I have an 01 quad cab and I don't have much heat. I took the motor off the heat door and moved it by hand back and forth to be sure it wasn't stuck. I also pulled the glove box door to feel the lines going to the heater core. The lines on the heater core are scalding hot, both sides. So my question. The temp runs normal and I never had a problem running hot even with 10,000 lbs. I noticed the moment(within 30 seconds) I stop moving the temp gauge starts dropping from just under 190 to the lower line within the normal temp range. How fast does the temp normally go down? Outside temp was about 55-60 degrees. I'm wondering if the thermostat is stuck open a little.

GAmes

If the thermostat is stuck open you wouldn't get up to normal temp unloaded. If both heater hoses are hot my guess is the core is partially clogged and not allowing full flow.

Jeeprat

Thanks, Thats what I figured. I had allready purchased a new core. I just didn't want to pull the whole truck apart to find out it was something simple.

Doj Dewd

STOP STOP STOP!!!

before you replace the core . . . go to cummins and get their cleaner flush. i did this flush on mine and the heat came back quite a bit. i then proceeded to replace the core anyway

after replacing the core, the heat was no better than it was after the flush. i should have just been happy with the flush, and 'not fixed it since it wasn't broken'!!!

Doj Dewd

btw - how did you remove the glove box door?

Jeeprat

To Late...I replaced it tonight. I had purchased an Advanced auto heater core about a week ago. I didn't have heat most of last winter but didn't want to pull it apart in freezing temps. I forgot I had flushed it last winter with a small gain in heat.

Turns out, that the Advanced Auto core has metal hoses with swivel connections. I didn't have to pull the AC apart or even pull the heater box. I dropped the steering column and the dash, bent the lines on the old core(to get it out of the box...cutting might be easier). Lifted the old core out and inserted the metal lines into the holes in the fire wall and gently rotated the new core into place. Took about 2 hours including a test drive. I know some of you may say the Advanced Auto core isn't the same quality.....Don't care. That job was easy. In fact, the worst part was getting the rubber lines off the old core without cutting them. I should have just bought new ones but the parts store was closed when I thought about it.

Thanks for the info anyway.

Jeeprat

Well...If you do this, I'm not responcible if you break it.

Open the door part way. Take the rubber bumpers off the door stops. Slide the door all the way to one side. Twist the side if the glove box by the door stop towards the way that you slide the door. Carfully slip it past the frame. Do the same on the other side. Don't over do it. The plastic will flex quite a bit..old stereo install tricks. Lower the door until the hinges unhook and remove. Reinstall the same way. Jeep cherokee's are the same way...I've Done it many times.

Diesel Dave2

Did the replacemet core fixed the problem??

RPegram

[QUOTE=Jeeprat;2596092]To Late...I replaced it tonight. I had purchased an Advanced auto heater core about a week ago. I didn't have heat most of last winter but didn't want to pull it apart in freezing temps. I forgot I had flushed it last winter with a small gain in heat.

Turns out, that the Advanced Auto core has metal hoses with swivel connections. I didn't have to pull the AC apart or even pull the heater box. I dropped the steering column and the dash, bent the lines on the old core(to get it out of the box...cutting might be easier). Lifted the old core out and inserted the metal lines into the holes in the fire wall and gently rotated the new core into place. Took about 2 hours including a test drive. I know some of you may say the Advanced Auto core isn't the same quality.....Don't care. That job was easy. In fact, the worst part was getting the rubber lines off the old core without cutting them. I should have just bought new ones but the parts store was closed when I thought about it.





Advance Auto sells many parts that are high quality. For example I've bought batteries from them and got five years out of them. Many of their parts are made by the same manufacturers as others. As with other parts houses, you have choices, cheap and inexpensive, quality and inexpensive or quality and expensive. One thing I like about them is you can choose manufacturer of part you want. Unless you know the owner of the local parts store personally, eventually almost everyone will need a part when they are closed and will be going to Advance or their equivalent. Of course I believe with everyone else, that some parts are better if genuine Cummins and some parts are better made by certain manufacturers, but with a little research you can buy quality inexpensive parts from Advance.

Jeeprat

Seems to have fixed it. Heat blows hot, much much better than before. The reason I hesitate....It's still 50-60 degrees outside. I'll let you know when it snows. In an attempt to have more heat than I want...I bought a quadzilla box so I can have the high idle option. I may even pick up a cold front kit instead of the old cardboard trick.


I wasn't knocking Adavanced Auto as I buy most of my parts there.

RPegram

Here in the frigid eastern North Carolina winters, I have to engage exhaust brake on '01 to keep temps in normal while idling. Since my frigid winters are compatible with some's normal springs and falls, I feel sorry for you all with the clothes you have to wear to stay warm.

Jeeprat

Lol...It's not just the cold. We get a 120" of snow on average. Last winter was no fun with little heat. I can take the cold but it's hard to defrost the windshield with luke warm air.

Does the exhaust brake work that good to keep the temps up?

Dangousity

I just use the radaitor air dam on the front of the grill, works great at getting and keeping me warm in the snow and freezing temps