I have a round knob on center shift counsel that says r,0,1,2,3,fan. I can not get the rear heater to go on and I checked all the fuses. Is there something else that needs to work like a relay or something that turns the power on to rear heat
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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!
Check that the coolant level is high enough in the overflow tank. Check that the 2 heater hoses going to the heater core are getting hot when calling for heat in the car at the control knobs or levers. Is the fan working? Is air blowing sufficiently as controlled by the fan speed control?
When you say your heater, do you mean the fan does not blow. or no heat fan blows fine. If it does not blow. The fan is located in the passenger side footwell, Turn fan to high and wack it a couple of times on center of cicular lookin thing, easily replaced by removal of screws around outside. If the fan works fine and it blows cold air make sure temperature adjustment knob is workin fine, you should hear it change when adjusting. One other thing, if someone just flushed your radiator or anything similir to do with coolant, check for a air bubble in the system, purge air out of heater core lines with a garden hose.
You need to repair the heater core with a soldering gun.
If you do not have heat, or only have heat, IMHO it is most likey the AC/heater control unit. This is the part which has the AC/heat control buttons and knobs.
Easy Diagnosis: The easiest way to verify this is to turn on the radio, press and hold the power on/off button and press and hold the scan-up button for a second (full second). The word "A/C TEMP" should appear on the left of the display and a number from 0 to 16 on the right. I suspect yours will have the number 0 (or 16 if heating only problem) displayed no matter where you turn the temperature control knob. If this is the case you could turn the temp. knob to full heat and see if it goes to 16 after pushing down or to the right on the knob. In a working system, the number moves evenly in increments of 1, from 0 to 16 as you turn the temperature knob.
Easy Fix: I was able to take mine out and solder 3 loose connections to fix it.
The beginning steps are the same as for any radio removal procedure and check for loose connections.
Pretty easy, no tools required if you have strong nails :)
First open the center console lid.
Grab the back edge of the trim panel where it stops at the top of the console box and pull upward. Work your way to the front disengaging the clips by lifting up. When you get to the front, unhook the connector from the 12V outlet and the heated seats buttons (if equipped). Set the trim panel aside
To remove the round trim around the shifter (likely not necessary) Remove philips screw from shift knob and lift shift knob off shaft. Lift round shift trim bezel off by disengaging 4 clasps located low at corners of bezel. Disconnect illumination bulb from bezel and set bezel aside for cleaning
During install, make sure the shift trim is inserted into shaft so the indicator will line up.
Check the operation of the temperature control door. It is located in the center of the dash behind the radio. Look up between the gas pedal and heater case. It is white in color Move the temp knob while watching the actuator. If it is clicking it is bad. Good luck.
I just fixed mine. same problem, no ac light no fan. inside the heater control assembly there is a electric wiper arm on the fan switch. This arm connects all power for fan and ac. Mine broke out of the fan control switch. Dash is not too much problem to get out. Have to pull top dash center section out by puching forward and lifting out. pull all screws on center dash counsel. remove radio, two side covers that hide screwsand lower trim that holds emergency flasher switch. remove cables from heater control and wires and remove. Took me about an hour. The code on radio will need to be reset so make sure you have that handy. Hope this helps..
vacume line take the front off the dash so it want get the way. look at all line theres a valve looks like a flat round disk if it dont work than throw it . plus your fan has 3 to 5 stages on the moter like low med hight