I need a wiring diagram heater 1999 jeep cherokee will npt blow

SOURCE: wiring diagram

Try this link http://autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/15/3e/8f/0900823d80153e8f.jsp

SOURCE: I need a wiring diagram for a 1999 Jeep Grand Cherokee

Here is the stereo wires which may help you figure out which are not the ac wires etc. hope this helps with some of the problem.

Constant 12V+ Red/White  Switched 12V+ White/Red  Ground Black  Illumination n/a  Dimmer Orange  Antenna Right Front  Front Speakers 6" x 9" Doors Left Front (+) Light Green/Red  Left Front (-) Light Green/Green  Right Front (+) Light Blue/Red  Right Front (-) Light Blue/Black  Rear Speakers 6 1/2" Rear Door Left Rear (+) Dark Green/White  Left Rear (-) White/Dark Green  Right Rear (+) White/Purple  Right Rear (-) Tan/Dark Green 

SOURCE: 1999 Jeep Cherokee

Both the transfer cases used during that time look similar. See the following diagrams:

NV247: http://www.wjjeeps.com/nv_247_01.jpg
NV242: http://www.wjjeeps.com/nv_242_01.jpg

Here are instructions w/ pics:

http://www.jeepsunlimited.com/forums/showthread.php?p=8647813

(If you have the 242 I believe you can use ATF+4 instead of the special Mopar fluid but I would check first to make sure).

SOURCE: Heater blows cold air when idle

Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.

SOURCE: 1999 Jeep Cherokee sport/air vents do not blow out cold or hot while it is on

this sounds like the recirculation door in the heater box is broken and this is a difficult and can be an expensive repair as the dash has to be removed for access. a quick check for this is if you release the glove box and let it hang you will see the heater box if you reach up to the left top you will feel a grid and the recirc flap is housed there you can operate the blower and hot and cold and see if flap moves