Air conditioner wont blow cold and multiple check engine lights are on, on a 1998 nissan sentra

SOURCE: 1995 Nissan Sentra, The engine light and brake

You could have faulty altenator or short causing the battery to drain. The engine light usually comes on when anything electrical or sensor wise is faulty. Brake light will come on if, low brake fluid, e-brake handle is up.

Phil Lovisek

• 726 Answers
• Posted on Jul 17, 2008

SOURCE: brake and battery light on

Alternator failure

SOURCE: brake and battery light stays on on 2000Nissan sentra

Have you checked the alternator?

SOURCE: brake light, 2008 Nissan Sentra

Open the trunk and locate the trim door that covers the back of the drivers side tail light assembly. Open the door and locate the bulb holder. The bulb holder can be removed from the tail light assembly housing by turning counter clockwise 1/4 turn. Holding the bulb holder in one hand, press gently on the bulb and turn then bulb counter clockwise to remove. Replace with a combo bulb and reverse proceedure to re-install.

SOURCE: heater blowing cold air

My 05 sentra with 79k miles heat will warm up and then get cold after a mile of driving, we have tried to get the air pocket out, the mechanic stated he thought it could be a blown head gasket, another mechanic said it was a bad heater core. Any advice would be appreciated.