My 01 Nissan Sentra is running hot when I drive, with no heat. I have replaced the thermostat and topped the coolant but no help. It stays normal temp when started in park with no heat in interior, but when I begin to drive it starts to get hot, with still no heat. Any help?

SOURCE: Water Temperature

I wouldn't, but it sounds like the sensor may be going.

SOURCE: No interior heat until I start to drive

You most likely have an "AIR LOCK" within the Heater Core. This requires one to pressurize the Cooling System and loosen the heater hose at the HIGHEST POINT and bleed the Air out of the Heater Core. I am not familiar with the Nissan but have encountered this problem numerous times over the years. Most late model vehicles are equipped with Air Bleed devices which must be utilized any time coolant is drained and refilled.

Most all reputable Auto Parts stores sell and/or rent a pump that temporarily replaces the Pressure Cap that may be utilized to pressurize the system for this purpose. If you don't feel capable of performing the bleeding operation take your vehicle to an ASE Certified Mechanic and have it done correctly.

Testimonial: "Great advice. That's what I thought it might be, but I wanted someone else's opinion on the matter. Thanks a lot."

SOURCE: recently had car moving to the hot line when

It's probably not the thermostat @ all !!!!! what it sounds like to me is a faulty temp. sensor.

SOURCE: 2006 Nissan sentra 1.8 Will not start cold Has

There is a problem with the fuel pump. This is a known problem with the 2006 Sentra and the dealer should have known this. Get your money back