Question about 2007 Nissan Altima 3.5 Sedan
Heater stuck on despite turning knob to cooler temps
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Posted on Jan 02, 2017
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
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Posted on Feb 24, 2009
If the engine is not over heating than most lilely it isn't the thermostat or waterpump that is causing the problem. Check the heater hose coming out of the manifold and see if it is warm to hot. Next check the return line from the heater if it is still cold or moch cooler than the inlet, the most possible problem is the heater water control valve if this model has one or possible the core of the heater is plugg with slime cause by some antifreezes setting during the summer months while not being used. If this is the case than remove tihe two hoses and back flush the heater core with water pressure until it runs clear. I have had this problem before and this cured my problem. I also had to flush the engine and radatior also. Hope this help. .
Posted on Mar 14, 2009
SOURCE: nissan altima heater does not
I had the same problem with my daughter's 2002 altima. The blower would not blow hot air. The mech. said I needed a new heat box. Thankfully, I got on line. There is a little white plastic gear that is supposted to turn when you switch from cool to hot. It must get stripped easily. Easy to find. look under the dash from drivers side. Turn the hot/cool switch and you'll see it trying to move. You can manually turn it but when you turn the car off it automatically switches back to cold. The nissan guy was very nice. He only had to order the plastic gear. ($8.00). But, I did have to pay to have it put on the car. Some could easily do it themselves. Much better than buying a heat box (400.00 dollars) hope this helps
Posted on Mar 23, 2009
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