no heat in maxima...HELP!!!!

[Nardia]

I have a 1990 nissan maxima and i can't get any heat inside. the heater blows cold air most of the time. what may be the problem?

[Will2]

Thermostat stuck in the open position.

you have an air pocket in your cooling system. there is a coolant bleed screw on the upper intake plennium, it's a 10mm head bolt with a copper gasket. pull it out fill the system until coolant comes out. good luck!

[krick]

You might have an air pocket in the heater core...

http://www.findarticles.com/p/articl...79/ai_60008947

System: Heating/Cooling

Symptom: Poor or no heat from the heater. This may occur after cooling system service.

Problem: Air is trapped in heater core.

Background: If you encounter a 1989-1991 Nissan Maxima with a complaint of poor heat from the heater, check with the customer to see if any cooling system service has been recently been performed. If so, air would have entered the cooling system at that time. If not, check for any leaks in the cooling system that could result in air getting into the system. The heater core in these vehicles is the highest point in the cooling system so if air gets into the cooling system, it can get trapped in the heater core and result in poor heating.

Fix: Make sure the cooling system is: free of leaks. Raise the front of the vehicle off the ground so that the bottom of the front bumper is approximately 39 inches off the ground. This will allow the top of the radiator to become the highest part of the cooling system. Make sure the cooling system is frill of good 50/50 mix of coolant and water. Leave radiator cap off. Set the heater on full hot on the manual systems and on 85[degrees] on the automatic climate control systems to let coolant through the heater core. Keep A/C off to keep the cooling fans from running continuously which could prevent the thermostat from opening. Run the engine at l500 rpm and warm it up completely--you may need to run it up to 30 minutes. After bleeding the cooling system in this manner, turn off the engine, make sure the radiator is filled and put the radiator cap on immediately. Lower the vehicle and make sure that the coolant overflow bottle is filled to MAX level mark. Let the engine cool down completely. You may need to r epeat the procedure to make sure all the air has been removed. Note: Nissan has released a revised coolant bleeding procedure to address this issue.