This is a common problem with these Jeeps. There is a plastic piece inside the thermostat control knob on each side (dual zone), which can break after time. It will not feel like it is broken when you turn it, but it is no longer changing the temperature and it will be stuck on the last setting it was on before it broke. One of your control knobs has this problem. It is a $25-$30 part that can be installed by most A/c repair shops or a Jeep dealership for a lot more.
Engine control module
One
No, the XJ Cherokee does not have the same heater box as a WJ Grand Cherokee.
The grand Cherokee is a body style, sport is a trim package that is used on all jeep models(wrangler, Cherokee, grand Cherokee, patriot, ...)
Cherokee Laredo, no. Grand Cherokee Laredo, yes.
TAke it to the dealer where they have the proper machines. That last answer really sucked, spoken like an union mechanic. Go to this link: http://www.justanswer.com/questions/1jjd3-2000-grand-cherokee-split
Go to www.wjjeeps.com and type HVAC in the search box. All the instructions are there.
The 1993 Jeep Grand Cherokee engine control module is located on the firewall in the engine compartment. The engine control module will be on the passenger side of the firewall.
Yes - IF and ONLY if both Cars have Automatic Climate Control. The computer settings are different (Or are 'supposed' to be) - You can always try - if it works great, if not, at least you know.
TCM Transmission Control Module
The tie rod torque bolt settings, on your 2000 Jeep grand Cherokee, is 70 pounds per square inch. The bolts should be torqued in 35 pound intervals.
Engine control module
Yes, it can cause the cruise to surge.
One
The 2007 Jeep Grand Cherokee transmission control module is located on the back of the transmission. The transmission control module will be in the upper left-hand corner of the transmission.
On the dash, near the ac control.
catlytic converter is plugged and needs replaced