I have an 89 coupe. The heads up doesnt work when its cold for some reason. It takes sometimes up to 15 min of driving for it to turn on but when its hot outside it turns on right away. The check engine light comes on and then after it turns on it goes away. If it turns on while Im stoped the check engine light will remain on untill I start moving than turns off right away. Does anyone have any ideas on what I can do to fix this? Thanks