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Why does my Heater SUCK!!

Discussion in '1st Gen. Tacomas (1995-2004)' started by muliefever, Apr 12, 2015.

  1. Apr 12, 2015 at 8:57 AM
    #1
    muliefever

    muliefever [OP] Muliefever

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    So I just did a full engine rebuild, the thermostat, water pump and coolant on my 2.7..

    With my truck at operating temp it seems like the heater is making choices on its own whether or not to be hot or luke warm! I dont get it.

    Any ideas?
     
  2. Apr 12, 2015 at 11:02 AM
    #2
    keakar

    keakar Well-Known Member

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    karl
    louisiana
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    used to have - 99 2.4L I4 5 lug & 04 prerunner v6
    did you install a radiator flush port so you can purge all the air out?

    its most common to get a big trapped pocket of air in the heater core so it doesn't put out enough heat. also confirm the flow valve functions and is adjusted correctly.

    but even when working correctly it takes 10-15 minutes to fully warm up the engine and kick out good hot heat
     
  3. Apr 12, 2015 at 1:47 PM
    #3
    CD20H

    CD20H Well-Known Member

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    Feel the heater hoses going into the firewall under the hood. If they are cold or luke warm then yeah, you need to bleed the air out of the heater core.
     
  4. Apr 12, 2015 at 1:49 PM
    #4
    Cypherian

    Cypherian Well-Known Member

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    Or just wait another week or 2 and you won't need the heater..:} But yea I vote air entrapment in the heater core .

    Cypher
     
  5. Apr 13, 2015 at 7:36 AM
    #5
    muliefever

    muliefever [OP] Muliefever

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    Cool thanks. I will do my best to bleed it out. I can drive to go steelhead fishing for example for most the day and it never gets Hot..
     
  6. Apr 13, 2015 at 7:53 AM
    #6
    Indy

    Indy Master of all I survey.

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    Yep, air lock or less likely a blocked core. Park on an incline and open the radiator cap, run for a while so the air works its way out.
     
  7. Apr 13, 2015 at 8:26 AM
    #7
    2scars

    2scars Swollen Member

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  8. Apr 13, 2015 at 8:58 AM
    #8
    xcmtb83

    xcmtb83 Well-Known Member

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    Check under the dash to make sure the cable housing didn't come undone. The cable housing came undone on both of my '96 Tacomas. If it comes undone it basically leaves the valve which controls coolant flow in whatever position it was in last.
     
  9. Apr 13, 2015 at 2:42 PM
    #9
    muliefever

    muliefever [OP] Muliefever

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    Thank you all for the tips!! I will report back!
     
  10. Apr 13, 2015 at 3:44 PM
    #10
    keakar

    keakar Well-Known Member

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    used to have - 99 2.4L I4 5 lug & 04 prerunner v6
    no need for all that, just need to put one of these in

    http://www.amazon.com/Dorman-47121-...8-1-fkmr0&keywords=radiator+flush+tee+fitting

    you can find em in all the auto parts stores and when water comes out all the air is gone and you put the cap back on it
     
  11. Apr 14, 2015 at 8:06 AM
    #11
    muliefever

    muliefever [OP] Muliefever

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    So I was at a buddies last night and he had one of these
    http://www.amazon.com/Lisle-24680-S...id=1428938693&sr=8-1&keywords=radiator+funnel

    We had my truck up to operating temp and ran it for about an hour. It did take a little bit of coolant. However, using a lazer temp gauge it would appear that my thermostat isnt opening?? the upper hose was reading like 180* where as the lower hose only like 63*...

    Also the hose going into the heater core was hot, coming out it is not.
     
  12. Apr 14, 2015 at 8:17 AM
    #12
    KdF

    KdF Old Rednek Type

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    The only sure way to test the core is to disconnect the hoses and hook up the garden hose to one side of it. Making sure the valve is open, you blow water thru it, and if it comes out the other end, your good, if not, it's toast.
     
  13. Apr 14, 2015 at 9:23 AM
    #13
    muliefever

    muliefever [OP] Muliefever

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    ok. thanks
     

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