Question about 2002 Nissan Altima

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No heat. Both thermostats replaced.

Where is the heater control valve located on a 2002 Altima 2.5L? Both heater hoses are hot but no heat.

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Pressure test the cooling system. Remove the spark plugs and inspect the top of the piston. Look for coolant. If you can see your own eye you found coolant. If the cooling system was properly bled and still no heat at idle you may find coolant in the cylinder. The head gasket would need to be replaced and the surfaces prepped. Machining the head is not recommended.

Posted on Feb 03, 2010

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have 2002 altima,blower works no heat at idle and very little heat when accelerating.I changed carbon cabin filter,made sure little gear under dash to temp knob wasnt broken,flushed and bled system.Nothing worked so checked hoses to heater core and found inlet hose was hot,outlet hose was not.So investigated this problem and came to conclusion heater core was clogged.An easy way to check is to get car to normal running temp. put on heater and blowers at full.Go under dash on passenger side where counsel meets firewall,this is where heater core core inlet and outlet aluminum tubbing go through firewall,you will be able to feel both tubes one closest to you is outlet, so if this one is not hot and and other is your heater core is clogged.I detached both inlet and outlet hoses to heater core from water control valve.Then I blasted water with waterhose and nozzle set at jet,first through outlet hose to blow gunk out,then through inlet hose until water runs clear.Reatach hoses fill and bled system.heater works great nice and hot!

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Nissan altima 2002 heater not getting hot


Try checking the heater control valve. Follow the heater hose from the engine, and as you get closer to the firewall, you should run into it. It is in line with the hose, and should have a vacuum hose connected to it. Apply vacuum to the valve and it should move. If not, then replace the valve. If there is no vacuum when engine running and heater turned on, then check the hose for leaks or the vacuum source.

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Check the heater control valve. Usually located on a heater hose between the firewall and where the hose attaches to the engine. Warm the engine, turn the heater on full hot, feel the hose with the valve in it. If the hose is hot on both sides then the valve is probably OK. If hot only on the engine side of the valve then the valve is not opening when the control calls for heat. Probably a stuck valve or leaky vacuum control hose. Otherwise I would suspect either a clogged heater core or a stuck open engine thermostat .

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heater control valve...check hoses going into heater core..both must be hot if heater control valve is good ..check flapper valve that closes off ac from heat..this is a door inside the duct work....thermostat replaced and radiator cap too.let me know just fixed my own

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I have an o2 altama and the heater does not work just cold air any suggestions


With the engine warm and the heat turned on, feel the hoses going through the firewall to the heater core. If one is hot and the other cold, you have a clogged heater core which must be backflushed to clear a blockage.

If the hoses are both cold, move up the hoses until you find a valve. This is the heater control valve. If it is hot on one side of the valve, that valve is clogged or shut. Investigate why the valve is not passing coolant - a clog or the actuator is broken/disconnected.

If both sides of the heater control valve are cold, replace the thermostat. While you have the thermostat housing open, make sure there are no blockages in the connection pipes.

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No heat changed thermostat


Are you saying the engine does not get hot or that your heaters are not working..?
If it's the heaters, change the temp control on the dash to full heat, then trace the heater hoses under the hood from the firewall back to the motor. Hopefully this will locate the heater tap. Now if the tap is vacuum operated, start the motor and check if there is vacuum at the small hose connected to the tap. No vacuum is correct. Now change the heater control to cold and there should now be vacuum at that small hose. if vacuum is still not present, or if you have vacuum but it does not go away no matter where the heater control is placed, suspect the control in the dash.. If the vacuum operation is correct, suspect a blocked or damaged heater valve and replace it..

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I do not have any heat in my blazer, the fan blows but no heat


Start with the engine hot and the temperature selector in the cabin set to max heat and the blower on. Raise the hood and locate the hoses going into the heater core (through the firewall). Check if both hoses are hot to the touch. If not, locate the control valve in one of the heater hoses and feel if it is hot on one side of the valve.

Have an assistant move the temperature selector inside the cabin. Watch the valve in the heater hose to see if it moves. If not, look for the problem with the mechanism. If it does, replace the thermostat.

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2004 NISSAN ALTIMA 2.5 NO CABIN HEAT..ENGINE AT OPERATING TEMP.


water pump is bad.....or thermostat is not opening....

Jan 14, 2009 | 2002 Nissan Altima

2 Answers

1998 jeep cherokeesport


Follow these steps:

Check coolant level, then start engine until it is warm and the thermostat opens. You will tell when it does when the needle on your temp gauge goes cold when it reaches around 180-200* and then goes back up. Now turn on your heater full blast and go to the engine compartment. You will see a heater valve located on the passenger side, next to the washer reservoir. It is a black thing with 4 heater hoses connected to it. Feel the hoses. When everything is working correctly it should be like this:

Hose going to waterpump will be hot
Hose going to (I think the thermostat housing) will be hot
2 Hoses going to heater core (mounted behind firewall) will be hot

1. If only 1 heater core hose is hot, heater core is clogged--
UNCLOG: remove 2 hoses going to heater core when engine is cool, hook water hose end to one of the sides and flush out gunk from heater core. Reconnect hose and you should be good.

2. If neither hose core hose is hot, heater control valve is bad or vacuum is bad--
Test Vacuum: remove vacuum line from heater control valve, you should feel the vacuum **** on it when pressed to your cheek and the heater control valve actuator should move when you unhook the vacuum line. If you have a good vacuum, it's probable the valve available at autozone part # 5941 for around $21.

To get heat while you wait to replace part, unhook silver arm on heater control valve that is hooked to the plunger. This will give you heat all of the time, but it is controlled by the bottom hot/cold switch on your heater control unit so you won't get hot in the cab. It will just circulate heat through the core.




Oct 25, 2008 | 1998 Jeep Cherokee

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