99 SSEI Climate Control problem driving me crazy. HELP!!!!!

[mrroj1]

im going crazy here. i`ve read alot of threads but i keep trying things and nothing fixes the problem.......

i just put the engine back in my car and the ECC flashes the outside temp and the air goes cold! i can see the actuator arm now that i pulled the glovebox. Everytime i turn the key on or start the car the arm moves smoothly all the way through its range to allow for heat. After about 30 seconds or so, the ECC starts to flash the inside set temp and the arm smoothly goes back the other way hence, closing the door for heat. i have tried many things, disconnect battery to reset whatever, disconnect outside temp probe( i have about 5 volts coming from the harness and i checked the probe for an open circuit), i have a spare ECC module from my 97 ssei(same part number), i tried that one, no matter what i do, i come back and find the same issue. Cooling system is full and both heater hoses are hot. When the car is warm and i turn it off and restart it, i get heat like normal. After about 30 seconds, BAM inside temp begins flashing and that door closes. When its cold and i let it warm up, the blower motor increases in speed as it should as the car warms but by this time the temp has been flashing and the door is closed,thus allowing no heat.
This car is super clean with only 78k on it. I stupidly let my 18 yr old son drive it once and he spun #1 rod bearing. (in case you were wondering why i had the engine out).

At this point i am going nuts, i love my SSEI and id even offer a reward for the correct fix!!!!! Thanks to all for helping in advance.

[Sirius]

The flashing ECC display means it has detected an error of some sort and will have set a fault code. Reading that error code will give you a clue where to look. Unfortunately I can't remember if there is some scan tool other than a TechII that can access those codes.

[mrroj1]

Thank you for your reply. I'll see if my friend has the Tech2