My 1993 maxima gxe i dont know whats wrong with it when the car is at idle it heats up the gauge goes between the H and C but the heater does not work when its between the H and C when i start to drive the car the gauge falls on the C or below the C than the heater works it blows out hot air but than goes to warm or even cold air its freezing here in utah i just want my heater to work what could be the problem and my H and C gauge to work correct

 

This has been covered in the noobie thread, If you would have read the responses, you would have already known to replace your thermostat..

Read This---> http://forums.maxima.org/6759420-post2368.html

Now that you read it, do you see the post by me?

We cant help you if you don't read and follow our instructions..