Ok, the Mark VIII experienced some technical difficulties. Yesterday the A/C was blowing out hot air, even when set at 60 degrees. This morning it worked fine. Then later on in the day when I tried to turn the A/C on.........nothing, it would not blow hot or cold or anything in between, nothing was happening. I think the control unit took a dump but I dont know. I bought another from ebay to test it out. Any idea what the problem is?. TIA.
Freigin A/C, need help!!!!!!
- Thread starter Destroyer
- Start date
Its a '95. By cooling fan you mean the radiator cooling fan?. I'll have to check. The A/C compressor does come on when I turn the A/C on but nothing comes out the vents in ANY mode now. No defrosters, vents, nothing. I hope its something simple.
The only reason I think it may be the control unit is because I had multiple symptoms. First the a/c was blowing hot and blower was working, then the next day the A/C was ice cold and blowing just fine. Now nothing works, the compressor clicks on but nothing blows out the vents. If it were the blower why would it blow only hot or cold?. Its 90 degrees outside, this is not good.
I wish I had the answer, but I don't. I feel for you Though, My blend door broke in December. No Heat! I would get exited when it got up to 45 outside.
Good luck!
UPDATE: The A/C, blower and everything started working again, but who knows how long that will last?. Anyway, taking this into consideration would you think this is some deep routed electrical problem or the AC/Heat control unit?. I dont see how it can be the blend door as the AC and the heat are now working and the blower is now blowing. Any ideas?. Thanks.
EATC self test:
Check this link as well...
Mark VIII Intermittent Blower Motor Fix
NOTE: Self diagnostics should be run in ambient temperatures of at least 10°C (50°F). Record all diagnostic trouble codes displayed during self diagnostics.
If the concern(s) remains after the inspection, perform the following EATC On-Board Self Diagnostics Test:
a. Turn ignition switch (11572) to RUN position.
b. Push both OFF and FLOOR buttons simultaneously, then press AUTO within two seconds.
c. NOTE: Display will be blank during testing.
After about 20 seconds, a code will appear in the window. Refer to the following Diagnostic Trouble Code Directory to identify the error for the proper diagnostic procedure:
DIAGNOSTIC TROUBLE CODE DIRECTORY
Diagnostic Trouble Code/Description/Action
01/Damaged control assembly./GO to Pinpoint Test A.
02/AC air temperature control door/GO to Pinpoint Test B.
03Automatic temperature control sensor openGO to Pinpoint Test N.
04/AC ambient air temperature sensor/GO to Pinpoint Test H.
05/AC sunload sensor short./GO to Pinpoint Test J.
d. To exit the diagnostics function press the blue button. When the control assembly is turned back on, the A/C air temperature control door will self-calibrate for 20 seconds.
If no DTCs are generated as a result of the self-diagnostic test (88°F°C code is displayed), determine the symptom(s) and go to the Symptom Chart.
If the concern(s) remains after the inspection, perform the following EATC On-Board Self Diagnostics Test:
a. Turn ignition switch (11572) to RUN position.
b. Push both OFF and FLOOR buttons simultaneously, then press AUTO within two seconds.
c. NOTE: Display will be blank during testing.
After about 20 seconds, a code will appear in the window. Refer to the following Diagnostic Trouble Code Directory to identify the error for the proper diagnostic procedure:
DIAGNOSTIC TROUBLE CODE DIRECTORY
Diagnostic Trouble Code/Description/Action
01/Damaged control assembly./GO to Pinpoint Test A.
02/AC air temperature control door/GO to Pinpoint Test B.
03Automatic temperature control sensor openGO to Pinpoint Test N.
04/AC ambient air temperature sensor/GO to Pinpoint Test H.
05/AC sunload sensor short./GO to Pinpoint Test J.
d. To exit the diagnostics function press the blue button. When the control assembly is turned back on, the A/C air temperature control door will self-calibrate for 20 seconds.
If no DTCs are generated as a result of the self-diagnostic test (88°F°C code is displayed), determine the symptom(s) and go to the Symptom Chart.
Check this link as well...
Mark VIII Intermittent Blower Motor Fix
Great info!. I need to get a scanner so I can run codes.
Hmmm, I did put in a Sony Mp3/CD player in it last week, wonder if I rattled something?. It didn't go in easy.
Haha...am I good or what?!
Driller recommended this above and I too agree. I think Destroyer missed it because it was at the bottom of a huge amount of information, lol.