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'02 Tundra heater not getting warm

Discussion in '1st Gen Tundras (2000-2006)' started by sfagrad83, Mar 15, 2016.

  1. Mar 15, 2016 at 5:53 AM
    #1
    sfagrad83

    sfagrad83 [OP] New Member

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    This just started a few days ago, but the heater in the cab of my truck has lost its ability to get warm. Any ideas what might be causing this problem?

    Thanks,
    Paul
     
  2. Mar 15, 2016 at 6:00 AM
    #2
    Wynnded

    Wynnded What MPG...

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    Have you checked coolant levels, and leaks?
     
  3. Mar 15, 2016 at 6:56 AM
    #3
    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

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    Blockage in the heater core not allowing heated coolant to circulate?
     
  4. Mar 15, 2016 at 7:38 AM
    #4
    T-Rex266

    T-Rex266 Insert Custom Title Here Staff Member

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  5. Mar 15, 2016 at 7:52 AM
    #5
    sfagrad83

    sfagrad83 [OP] New Member

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    Cause and/or remedy?
     
  6. Mar 15, 2016 at 8:03 AM
    #6
    Virgils12

    Virgils12 New Member

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    Thermostat stuck? Does it get hot or how does the temp gauge look?
     
  7. Mar 15, 2016 at 8:03 AM
    #7
    sfagrad83

    sfagrad83 [OP] New Member

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    How can that be checked?
     
  8. Mar 15, 2016 at 10:13 AM
    #8
    sfagrad83

    sfagrad83 [OP] New Member

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    What temp thermostat for '02 tundra 4.7 v8?
     
  9. Mar 16, 2016 at 8:44 AM
    #9
    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

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    If the thermostat is stuck in the open position, the engine can't heat the fluid properly. If the thermostat is stuck in the closed position you will see the coolant temperature gauge indicate engine as overheating. If either, you will need to install a new thermostat. If the heater core is blocked with debris, you may be able to get it flushed out or you may need a new heater core. I assume your heater/AC fan is working ok to blow air, right?
     
  10. Mar 16, 2016 at 11:12 AM
    #10
    garnaz

    garnaz New Member

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    Heater control valve?
     
  11. Mar 16, 2016 at 12:39 PM
    #11
    sfagrad83

    sfagrad83 [OP] New Member

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    A/C blows cold. Replaced thermostat and still no warm air.
     
  12. Mar 16, 2016 at 12:40 PM
    #12
    sfagrad83

    sfagrad83 [OP] New Member

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    Coolant levels are perfect and no leaks. Replaced thermostat and still not warm air.
     
  13. Mar 16, 2016 at 12:42 PM
    #13
    Virgils12

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    Are you sure your blend door is working correctly?
     
  14. Mar 16, 2016 at 3:41 PM
    #14
    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

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  15. Mar 16, 2016 at 7:33 PM
    #15
    LOTSOFTOYS

    LOTSOFTOYS Toyota Whisperer

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    Da da da daaaaaaaaaaaaa
    Not lol. No expert here.... just work on these pieces of crap;)

    Do u have no coolant problems? Engine runs fine and gets to proper Temps?


    What does ur temp know feel like? Really easy to spin? Really stiff?
     
  16. Mar 16, 2016 at 7:35 PM
    #16
    LOTSOFTOYS

    LOTSOFTOYS Toyota Whisperer

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  17. Mar 16, 2016 at 7:37 PM
    #17
    sfagrad83

    sfagrad83 [OP] New Member

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    To tell you the truth, NO. Is there an easy check?
     
  18. Mar 16, 2016 at 7:44 PM
    #18
    sfagrad83

    sfagrad83 [OP] New Member

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    I just watched a youtube video on flushing a heater core, and I plan on trying that tomorrow. Thanks.
     
  19. Mar 31, 2016 at 11:57 AM
    #19
    sfagrad83

    sfagrad83 [OP] New Member

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    Yes. I took the part of the dash out and checked. I have replaced thermostat and flushed heater core twice, and still no heat. I have no leaks and have plenty of coolant. I checked the valve, and no leaks and it opens and closes as it should. I am completely stumped.
     
  20. Mar 31, 2016 at 11:58 AM
    #20
    sfagrad83

    sfagrad83 [OP] New Member

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    Yes it is working properly. I have replaced thermostat and flushed heater core twice, and still no heat. I have no leaks and have plenty of coolant. I checked the valve, and no leaks and it opens and closes as it should. I am completely stumped.
     
  21. Mar 31, 2016 at 12:35 PM
    #21
    sfagrad83

    sfagrad83 [OP] New Member

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    Knob feels fine. And the control valve is working properly. I took both hoses loose and watched the valve operate. Opens and closes just fine. Dampers are working too. Baffled.
     
  22. Mar 31, 2016 at 1:03 PM
    #22
    Tracker

    Tracker New Member

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    my old silverado stopped working too. I found out the radiator had a leak at some point the previous owner put the stop leak stuff in it. It clogged the heater core. I replaced the core and it was new again.
     
  23. Mar 31, 2016 at 5:25 PM
    #23
    LOTSOFTOYS

    LOTSOFTOYS Toyota Whisperer

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    No you need to look on the drivers side of the heater box down by the gas pedal. Turn the temp knob and see if the blend door is moving while u turn.
     
  24. Apr 11, 2016 at 6:36 PM
    #24
    sfagrad83

    sfagrad83 [OP] New Member

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    "Check Engine" light came on today. Code: P0770 indicates a fault in the A/T Shift Solenoid "E" (SL) Malfunction (Mechanical). What's the best/worst case scenarios here?
     
  25. Apr 11, 2016 at 6:57 PM
    #25
    LOTSOFTOYS

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    Bet case scenario is there is chewed wires near the trans. Worst case scenario is you need a trans
     
  26. Aug 11, 2019 at 11:50 AM
    #26
    Levijack01

    Levijack01 New Member

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    I have the same heating problem. I did every thing you did. If you have found the fix for the heating problem, let me know on her. levijack01 or email levijack100@windstream.net Thanks
     
  27. Aug 13, 2019 at 11:15 AM
    #27
    00TundraZ

    00TundraZ New Member

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    Solenoid isn't normally a shot tranny. I replaced mine and have had zero issues since. Make certain you have the same tranny (there is a sticker on the drivers side door frame that shows which model you have)

    I used the below solenoids for my truck!

    https://www.amazon.com/gp/product/B01EOAWHNO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

    This listing states that these do not fit my transmission, however upon inspection of the solenoids I was able to confirm without a doubt these are correct. Been running them for over 6 months and no problems. For the price, it's not a bad place to start...
     

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