Fixed temperature control problem,(heater doors in dash).Put it back together and now jeep won't start on its own,no codes will show,or done in odomiter.Jeep will start with prime,and run well with no hesitation in power.45 pounds fuel pressure with ignitition on,50 while running.2002 jeep grand cherokee 4.7 h.o. pls. help.

usa car? 4.0L?
1990 is super old jeep.
XJ begam in 1984 to 2001
the became KJ
quotes first

The vacuum switch controls vacuum to
defroster, floor, panel and fresh/recirculated air vacuum motors, as
well as a vacuum-actuated heater control valve (water valve). The
heater control valve closes when vacuum is applied to it.
The A/C switch is closed when the lever is in any of the A/C
modes (MAX, NORM or BI-LEVEL). The temperature control lever (lower
lever) moves a cable that controls the position of the blend-air door
in the heater case.
the controls on the dash control all vaccum
vacuum input from engine intake plenum port. 20"Hg at idle

no probem told at all just vugue,heater deal.
is the heater dead
or heater bend door dead
or heater water control valve dead (vacuum side dead) or just jammed. closed. we use a hand vacuum pump to test all vacuum servo slaves, and to see if vacuum commands are dead to any hose with a vacuum gauge.
or is this a pure dash vacuum controls all dead for all.>?
blower not dead on high?

here it is , All i need is this to fix it.
vacuum only map

if the question was water(not told)
then the answer is violet.
there are air valves and water valves both./
air valves are called xyz doors.
on hinges.too, axle hinged doors.

You will need to remove the cluster and make sure you plugged in all the connector to the cluster, the antitheft system runs throught the cluster also and you said fuel gauge doesnt work so i would have to say theres a bad connection or you forgot to plug a connector in. good day.

Jeeps are notorious for having broken temperature control (Blend Air) doors. A malfunctioning Blend Air Door actuator probably caused it to break. The dash will have to be removed to replacethe door and the door actuator.

Could be the heater bypass valve is stuck or the heater core is blocked.
I'd check the heater core first.You may have trapped air in the cooling system or the heater core may be partially plugged up. Engine coolant is delivered to the heater core through two heater hoses. With the engine idling at normal operating temperature, set the temperature control knob in the full hot position, the mode control switch knob in the floor heat position, and the blower motor switch knob in the highest speed position. Using a test thermometer, check the temperature of the air being discharged at the HVAC housing floor outlets.
Temperature Reference
Ambient Air Temperature 15.5° C (60° F) 21.1° C (70° F) 26.6° C (80° F) 32.2° C (90° F)
Minimum Air Temperature at Floor Outlet 52.2° C (126° F) 56.1° C (133° F) 59.4° C (139° F) 62.2° C (144° F)
If the floor outlet air temperature is too low, Both of the heater hoses should be hot to the touch. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. If the return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in the cooling system.
OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant flow: Pinched or kinked heater hoses. Improper heater hose routing. Plugged heater hoses or supply and return ports at the cooling system connections. A plugged heater core. If proper coolant flow through the cooling system is verified, and heater outlet air temperature is still low, a mechanical problem may exist.
MECHANICAL PROBLEMS
Possible locations or causes of insufficient heat: An obstructed cowl air intake. Obstructed heater system outlets. A blend door not functioning properly.
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be adjusted with the temperature control knob on the A/C Heater control panel, the following could require service: The A/C Heater control. The blend door actuator.
The blend door. Improper engine coolant temperature

First while the engine is cool remove radiator cap and make sure it is full of coolant. Run the engine till temperature reaches mid way on gauge.Feel radiator and heater hoses, should be very warm to touch,if hoses are cool, thermostat might be stuck open. If hoses are hot, sit in passenger seat and turn heater controls to high heat, turn control to make air come out dash vents , from left to right feel temperature of air from vents .A temperature change can mean a problem with the air inlet door, mode door or blend door . This seems to be a common problem. Further inspection will be needed to verify which actuator and door is the problem. There is a Technical Service Bulletin with infomation and a list of parts you can get from your dealer. This is not an easy job, most if not all of the heater housing will have to be remove. Hope this helps. If this is your problem and you dicide to do the repair I can give some help with information on removing dash components.This can be a 4 to 9 hour job depending on with part is bad.

2 possibilities. 1 - the heater system isnt getting adequate hot water flow from the engine and not heating the air for your heater to function. This can be due to a defective heater control water valve, a plugged heater core, a disconnected or plugged heater hose.
2 - the system is in fact getting heat, but your heat is bypassed/lost due to dashboard vent and blend door errors breakage common with that era of jeep. have the valve/cor/heater hose flow checked. If that doesnt show issues, have the vent control system checked for blend door or dash door breakage. beware, its alot of labor to change the dash solenoids when they brake, ALOT of labopr (6 hours or more!) so if you are committed to fixing it because a solenoid and/or sensor broke in there, I highly recommend you chaneg ALL solenoids wuith new rather than risk another breaking in a month and the 6 hours of labor must be repeated.

temp fix is to take both heater core hoses and put them together vent door travel is to long/axle on door vnt is stripped out oractuator motor is.

I purchased a Blen Door repair kit. for my 2002 Jeep Grand Cherokee after having only cold air blow out of the passenger side for over a year. I found it on EBay. It requires you remove the glove box, cut open the heater box and replace the blend door. I really didn't want to cut that open, however, with the tape that comes with it, I have had no problems with it leaking any air. The dual control no longer works, the temperature is now completely controlled by the drivers side, but to save $1200, I was willing to do this. I have taken the entire thing out before to replace the heater core, didn't want to do it again.

Well lucky you i just fixed one of these jeeps at work. I take it that there is dual zone control one the jeep. First off its a 6 hour job you have to remove the entire dash and heater control unit. On the back side of the heater control housing there is a small motor that controls a heat blend door i found the motor to be ok but the door was broken. if you go to you're dealer they have a new updated door and a few other pieces you have to put in also. Also if they check the computer codes there will be a few codes im sure . I woul dleave this one up to the pro's but if you wana try it let me know.

Try heatertreater.net. It's easy and worked. $130 well worth it.