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Question
I have a 2000 Jeep Grand Cherokee and the heater went out today. It still blows out air, but it is cold air. What could cause this?
Submitted: 792 days and 10 hours ago.
Category: Car
Value: $15
Status: CLOSED
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Optional Information
Optional Information:
2000 Jeep Grand Cherokee 4.7L V8
Posted by
JHoop
792 days and 10 hours ago.
Info Request
Hello XXXXXXXXXX, my name is XXXXX. XXXXX you for choosing justanswer.com.
Couple quick questions for you while I pull up some diagrams:
-Do you have the Automatic Climate Controls?
-Is there a warning light on? (check engine, hvac, etc.)
792 days and 9 hours ago.
Reply
Yes I do have automatic climate control, and no there is no warning light on. I thought there might be a chance that the automatic part was the problem, so I took it out of automatic and cranked it to the high setting for the fan. Same result, more cold air. The temperature selector level was also set to "hi".
Accepted Answer
OK...You are definetly on the right track. After looking at this service bulletin, I think it could very well be the Control Unit. Here is the Bulletin:
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If not this, I still think the controls could be at fault. Simply because there has been more than one issue with this particular model control. Your HVAC Control unit also comes with a self-diagnostics menu or stored code area. You might try accessing it as well. Here is the procedure for that:
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If you are able to retrieve codes, here are the definitions:
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If you are still having problems, let me know. There are a few more things that we can try. Although, I think we are on the right track.
I hope this helps you. If you have any more questions or need any more diagrams, please don't hesisitate to ask...Thanks again, JHoop
Expert:
JHoop
Pos. Feedback:
98.3 %
Accepts:
1044
Answered:
1/19/2008
Technician
10 Year Engine Builder, HvyLine, Suspension, Electrical, Brakes, 3 Year Shop Owner
791 days and 11 hours ago.
Reply
So I did the diagnostic and it gave me codes of 52 and 54. What does this mean I need to do? Do I need to replace the climate control module or do I need to take it to a dealer?
Posted by
JHoop
791 days and 10 hours ago.
Answer
OK...Basically, these mean that the Flapper Door that moves the climate temperatures, is not working.
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Unfortunatly, you have to remove the dash to get to is. Pretty heafty job. If you would like the dashboard removel steps, let me know and I will get them for you. If you have any more questions or need any more diagrams, please don't hesisitate to ask...Thanks again, JHoop
791 days and 10 hours ago.
Reply
Is this something I need to replace, or just get to it and mechanically agitate it. If thats the case, then I do need the dash removal procedure. And is this something that I can do myself or should I take it to a mechanic to do?
Posted by
JHoop
791 days and 10 hours ago.
Answer
I would say, if you took your time, payed attention, and don't lose any screws, you could pull this off yourself. Being that the case, i'm going to start from the top.
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INSTALLATION
1. Prior to installing the instrument panel into the vehicle, loosen the three nuts that secure the instrument panel intermediate bracket and the accelerator pedal assembly to the studs on the dash panel.
2. With the aid of an assistant, load the instrument panel assembly through the driver side front door of the vehicle and hang it on the studs on the dash panel near the windshield fence line.
3. Be certain that the molded plastic hook formations on the instrument panel structural duct are inserted into and seated in the guide holes at each cowl side inner panel.
4. Loosely install the two screws that secure each end of the instrument panel to the cowl side inner panels.
5. Install and tighten the two screws that secure the passenger side instrument panel structural duct to the heater and air conditioner housing. Tighten the screws to 11.8 Nm (105 in. lbs.) . See: Instrument Panel Structural Duct Replacement
6. Install and tighten the one screw that secures the instrument panel steering column support bracket to the driver side end of the heater and air conditioner housing. Tighten the screw to 11.8 Nm (105 in. lbs.) .
7. Tighten the two screws that secure each end of the instrument panel to the cowl side inner panels. Tighten the screws to 11.8 Nm (105 in. lbs.) .
8. Install and tighten the one screw that secures the instrument panel steering column support bracket to the intermediate bracket on the driver side dash panel. Tighten the screw to 11.3 Nm (100 in. lbs.) . See: Steering Column Trim/Bracket Replacement\Instrument Panel Steering Column Support Bracket Replacement
9. Tighten the three nuts that secure the instrument panel intermediate bracket and the accelerator pedal assembly to the studs on the dash panel. Tighten the nuts to 11.3 Nm (100 in. lbs.) .
10. Install and tighten the four nuts that secure the instrument panel to the studs on the dash panel near the windshield fence line. Tighten the nuts to 11.8 Nm (105 in. lbs.) .
11. Install and tighten the nut that secures the instrument panel steering column support bracket to the stud on the driver side cowl plenum panel. Tighten the nut to 28.2 Nm (250 in. lbs.)
12. Install the instrument panel to center floor tunnel bracket onto the instrument panel and the floor panel transmission tunnel. See: Instrument Panel to Center Floor Tunnel Bracket Replacement
13. Reconnect the two instrument panel wire harness connectors to the two heater and air conditioner housing connectors located near the blower motor on the passenger side end of the housing.
14. Reconnect the two halves of the radio antenna coaxial cable connector near the right cowl side inner panel under the end of the instrument panel.
15. Reconnect the instrument panel wire harness bulkhead connector to the lower cavity of the inline connector on the passenger side cowl side inner panel and tighten the connector screw. Tighten the screw to 4 Nm (36 in. lbs.) .
16. Install the lower right center bezel onto the instrument panel. See: Lower Instrument Panel
17. Install the end cap onto the instrument panel. See: Instrument Panel End Cap
18. If the vehicle is equipped with the manual heating and air conditioning system, reconnect the vacuum harness connector located near the driver side of the floor panel transmission tunnel behind the driver side floor duct.
19. Position the driver side floor duct to the heater and air conditioner housing near the driver side of the floor panel transmission tunnel.
20. Install and tighten the one screw that secures the driver side floor duct to the heater and air conditioner housing near the driver side of the floor panel transmission tunnel. Tighten the screw to 2.2 Nm (20 in. lbs.) .
21. Route the instrument panel wire harness to the floor panel transmission tunnel and engage the retainers that secure the harness to the mounting brackets on the tunnel.
22. Install the instrument panel wire harness ground eyelets to the studs on the floor panel transmission tunnel in front of and behind the airbag control module and secure the eyelets with nuts. Tighten the nuts to 7.3 Nm (65 in. lbs.) .
23. Reconnect the instrument panel wire harness connectors to the following floor panel transmission tunnel components:
o the airbag control module connector receptacle
o the park brake switch terminal
o the transmission shifter connector receptacle.
24. Reconnect the left and right body wire harness bulkhead connectors, the Ignition Off Draw (IOD) wire harness connector and the fused B+ wire harness connector to the connector receptacles of the junction block. Tighten the bulkhead connector screws. Tighten the screws to 4 Nm (36 in. lbs.).
25. Engage the lower steering column shaft with the steering shaft coupler and position the steering column to the mounting studs on the instrument panel steering column support bracket. See: Steering Column Trim/Bracket Replacement\Instrument Panel Steering Column Support Bracket Replacement
26. Install and tighten the four nuts that secure the steering column to the studs on the instrument panel steering column support bracket. Tighten the nuts to 11.8 Nm (105 in. lbs.).
27. Install and tighten the bolt that secures the coupler to the lower steering column shaft. Tighten the bolt to 49 Nm (36 ft.lbs.).
28. Turn the ignition switch to the On position, then install the shifter interlock cable connector into the ignition lock housing receptacle.
29. Reconnect the instrument panel wire harness connectors to the following steering column components:
o the two lower clockspring connector receptacles
o the left multifunction switch receptacle
o the right multifunction switch receptacle
o the two ignition switch receptacles
o the shifter interlock solenoid receptacle
o if the vehicle is so equipped, the Sentry Key Immobilizer Module (SKIM) receptacle.
30. Position the lower tilting steering column shroud to the steering column multifunction switch mounting housing, then install and tighten the screw that secures the shroud to the housing. Tighten the screw to 1.9 Nm (17 in. lbs.) .
31. Position the upper tilting steering column shroud over the steering column. Align the upper and lower shrouds with each other and snap the two halves together.
32. Install the steering column bracket onto the instrument panel steering column support bracket.
33. Install the steering column opening cover onto the instrument panel.
34. Install the cluster bezel onto the instrument panel.
35. Install the fuse cover onto the junction block.
36. Install the console onto the floor panel transmission tunnel.
37. Install the trim panels onto the right and left inner cowl sides.
38. Install the scuff plates onto the right and left front door sills.
39. Install the top cover onto the instrument panel. See: Instrument Panel Top Cover Replacement
40. Install the trim onto the right and left A-pillars.
41. Reconnect the battery negative cable.
And that just gets you down to the housing to make your adjustments/repairs. Granted you wont be performing some of the things described, but most you will. When you get down to the Housing, there will be the 4 mode doors. Adjustment might help, but more than like just replace sense you are already down that far (ain't no needing going back lol). I hope this gives you a jest of the task at hand. If you have any more questions or need any more diagrams, please don't hesisitate to ask...Thanks again, JHoop
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