Heater blower comes on and blows hot air on it's own?

It sounds like the speed control module is bad, here is the location so you can check it out or get a new one. Check out the diagrams (Below). Please let us know what happens.

Check for loose fitting fuse, damaged wirig and connectors, do the following test's

TEST 4A - ATC HEAD COMMUNICATION FAILURE

1) If this test is being performed because "NO RESPONSE" was displayed on DRB, go to step 3). If this test is being performed for reason other than "NO RESPONSE" message being displayed on DRB, go to next step.
NOTE:A low battery or a momentary bus failure could cause trouble codes observed to set.

2) Record trouble codes and then use DRB to erase all trouble codes. Start engine, turn ATC head on and allow engine to run for at least 2 minutes. Turn engine off, ignition on. Using DRB, read and record BCM trouble codes. If no trouble codes are displayed, system is operating correctly. If IN CAR SENSOR trouble code is displayed, go to TEST 9A. If any of the following trouble codes are displayed, go to step 3):
ATC HEAD CCD COMM FAILURE
ATC HEAD COMM TEST FAILED
ATC HEAD STATUS MESSAGE NOT RECEIVED
STATUS 26 NOT RECEIVED
DIMMING MESSAGE
3) Turn ignition switch off. Locate junction block on left kick panel. Remove and inspect fuse No. 6. If fuse No. 6 is okay, go to step 5). If fuse is blown, using DRB ohmmeter, probe load side of fuse No. 6 (White wire). If resistance is greater than 5 ohms, replace fuse No. 6 and perform VERIFICATION TEST. If resistance is less than 5 ohms, go to next step.
4) Disconnect ATC module 8-pin connector. Ensure connector is clean and not damaged. Using DRB ohmmeter, probe harness connector terminal No. 8 (White wire). If resistance is less than 5 ohms, replace fuse No. 6 and repair short to ground in White wire between fuse No. 6 and ATC module 8-pin connector. If resistance is more than 5 ohms, replace ATC head and fuse No. 6. Perform VERIFICATION TEST.
5) Reinstall fuse No. 6. Turn ignition on, with engine off. Using DRB voltmeter, probe load side of fuse No. 6 (White wire). If voltage is greater than 10 volts, go to next step. If voltage is less than 10 volts, repair open circuit (Black/Orange wire) between fuse No. 6 and ignition switch. Perform VERIFICATION TEST.
6) Disconnect ATC module 8-pin connector. Ensure connector is clean and not damaged. With DRB voltmeter, probe terminal No. 8 (White wire) on ATC module 8-pin connector. If voltage greater than 10 volts, go to next step. If voltage is less than 10 volts, repair open White wire between fuse No. 6 and ATC module 8-pin connector. Perform VERIFICATION TEST.
7) Turn ignition off, close all doors and ensure courtesy lights are all off. Using DRB ohmmeter, probe terminal No. 2 (Black wire) of ATC module 8-pin connector. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair open Black wire between ATC module 8-pin connector and ground.
8 ) Using DRB ohmmeter, probe terminal No. 7 (Black/Light Green wire) of ATC module 8-pin connector. If resistance is less than 10 ohms, go to next step. If resistance is greater than 10 ohms, repair open Black/Light Green wire between ATC module 8-pin connector and ground.
9) Connect ATC module 8-pin connector. Turn ignition on. Press rear window defroster button. If rear window defroster relay (inside ATC module) clicks, go to next step. If relay does not click, replace ATC module. Perform VERIFICATION TEST.
10) Turn ignition off. Disconnect ATC module 8-pin connector. Connect jumper wire between CCD BUS+ terminal No. 3 (Violet/Brown wire) of ATC module 8-pin connector and ground. Using DRB, check CCD BUS status. If DRB displays "BUS SHORTED TO GROUND", go to next step. If DRB does not display "BUS SHORTED TO GROUND", repair open CCD BUS+ (Violet/Brown wire) circuit.
11) Disconnect jumper wire from CCD BUS+ circuit. Connect jumper wire between CCD BUS- terminal No. 4 (White/Black wire) ATC module 8-pin connector and ground. Using DRB, check CCD BUS status. If DRB does not display "BUS SHORTED TO GROUND", repair open CCD BUS- (White/Black wire) circuit. If DRB displays "BUS SHORTED TO GROUND", replace ATC module.