QuestionI have an 89 Seville. The check engine light went on. I look at the codes for the car and there are B120 and B121. do you know what they mean. I also have no heat coming from the vents, the blower is running but no air coming out. Thanks for your time.
Chad
AnswerB120 = Twilight sentinel delay potenteometer circuit problem.
B121 = Twilight sentinel enable circuit problem.
Both codes have NOTHING to do about your AC problem.
Where is the air coming out ?. Is it coming out of the defrosters on both heat and when on AC ?.
If it is, Look for a vacuum hose leak where the vacuum hose goes thru the firewall from the engine compatment.
Does your emergency brake release when you put the car in gear with the engine running ?. If it will NOT release there is a small black metal manual release lever just below the dash at the emergency brake.
