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| 05 not producing heat inside cab http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=47781 |
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| Author: | mngoat01 [ Wed Nov 11, 2009 12:24 pm ] |
| Post subject: | 05 not producing heat inside cab |
Notice the jeep not producing as much heat as it normally does....it still does heat but seems like I need to be running it all the time with colder temps(maybe I'm just getting old  ).....water temp gauge seems to hit the same spot as it always has( About 1.5 marks short of the halfway mark) Anything that i can check? Fan seems to be blowing just fine...heater core issue? ....Thanks.
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| Author: | Sir Sam [ Wed Nov 11, 2009 2:25 pm ] |
| Post subject: | |
1.5 marks short of halfway? Sounds cold to me. Have someone look at the viscous heater on the engine during a cold engine startup. After startup you should see the clutch engage. |
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| Author: | GreenDieselEngineering [ Wed Nov 11, 2009 7:50 pm ] |
| Post subject: | |
It could be a heater core issue or some sort of blockage in the coolant supply/return lines to the heater core. It could also be an issue with the damper on the control head, maybe it is sticking due to a vacuum leak or the control head is going bad. If the coolant gauge is still reaching the warm mark, there should be plenty of heat to transfer to the airstream. In very cold weather if the viscous heater is not working the coolant temp indicator will be about 3 ticks lower than normal if the vehicle is left idling for about 10 minutes. Do you have a noticable change in heat based on engine rpm? higher rpm will push more coolant through the heater core and should increase the air temps. most noticeable is going from idle to about 1800 rpm. good luck |
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| Author: | tulsa [ Thu Nov 12, 2009 8:12 am ] |
| Post subject: | |
Is the coolant up to full mark? I am sure you have checked, but just in case. Lewis |
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| Author: | Turbo Tim [ Thu Nov 12, 2009 10:07 am ] |
| Post subject: | |
I remember reading somewhere that there is a procedure to calibrate the flapper door for the heat. It was back around where you could modify the mode selector to turn off the ac in the heating modes. I'll look at my notes and post if I find something, otherwise if someone else remembers please post. |
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| Author: | mngoat01 [ Thu Nov 12, 2009 5:18 pm ] |
| Post subject: | |
thanks guys, I'm slowing checking things over. Doing a few test from the service book.....I'll look into what has been mentioned here. |
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| Author: | Turbo Tim [ Thu Nov 12, 2009 5:36 pm ] |
| Post subject: | Blend Door Actuator Calibration.... |
If you want to recalibrate your hot/cold blend function, here is how you do it. Right off of page of page 24-1 in the service manual. Manual calibration of the A/C-heater control should be performed if the blend door actuator is not functioning properly, or if the temperature of the conditioned air is too warm with the temperature control in the full cold position or too cool with the temperature control in the full hot position. MANUAL CALIBRATION PROCEDURE NOTE: This calibration procedure can only be started within the first ten seconds after the ignition switch has been turned from the Off position to the On position. Make sure that the battery is fully charged prior to beginning the calibration procedure. NOTE: The length of the pause made at each end of the temperature control rotation (sweep) is important. The manual calibration may not occur correctly if the pause is too short (less than 0.5 seconds) or too long (greater than 1.5 seconds). (1) With the ignition switch in the Off position, move the temperature control to its middle (12 o’clock) position (Fig. 18). (2) Turn the ignition switch to the On position (do not start the engine). (3) Within 10 seconds of turning the ignition switch from the Off to the On position, perform the following rotations (sweeps) of the temperature control. (a) From the 12 o’clock position, rotate the temperature control counter-clockwise to the full cold position. Pause one second. (b) Rotate the control clockwise to the full hot position. Pause one second. (c) Rotate the control counter-clockwise to the full cold position. Pause one second. (d) Rotate the control clockwise to the full hot position. Pause one second. (e) Rotate the control counter-clockwise to the full cold position. |
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| Author: | DOC4444 [ Wed Nov 18, 2009 12:13 am ] |
| Post subject: | |
Those instructions are on Pg 24-21 of my Manual. My wife complained of a lack of heat when the temp gauge is in the normal position indicating full warmup. I realized the heater control circuit board had just been replaced by the dealer and figured they had neglected to recalibrate the blend door. I ran the "procedure" as best I could. However, the instructions do not indicate what position the heater control knob should be in while performing the recalibaration procedure. The manual diagram (Fig. 18) shows the knob in the "off" position, so I put it in this position while performing the procedure. Does anyone know if this is correct? After doing this once and fully warming up the vehicle (32F ambient, Fia blanket, viscous heater disabled), I got 110F out of the dash vents on "dash only" and 95F out of the driver's side floor with the control on "floor only". (The AC disable mod has not been done.) The passenger side floor vent put out 100F at the same time. Do these numbers seem reasonable? The FSM reference numbers only go down to 60F where they call for the floor vents to put out 126F. Based on that, at roughly half that ambient 95-100 would seem reasonable to me. What do you folks think? DOC |
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| Author: | DOC4444 [ Thu Nov 19, 2009 11:19 am ] |
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