Question about 2006 Toyota Sienna

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Why does the front heater only blow cold air

The front heater only blows cold air no matter what temperature setting is used. The rear heater works fine but takes a while to heat the whole interior. Could this be a fuse problem? Do both the front and rear heaters have independent heater systems?

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  • Toyota Master
  • 796 Answers

You must listen when changing the temperature from cold to hot to see if you can hear the heater duct opening & closing,if not could be a vacuum hose is disconnected or broken,or the vacuum motor that moves the duct door has broken you might hear a hissing sound,or a cable has broken,I don't think it's a fuse ,because it's working when you turn it on,those are good possible causes I have given you have fun & I hope you have small hands,limited space acess

Posted on Dec 29, 2012

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6ya6ya
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Posted on Jan 02, 2017

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motor1258
  • 6674 Answers

SOURCE: I have a problem with the heat in my 99 4 runner.

When was last flush and thermostat replaced? Also, it may sound crazy but, when I have a partially clogged heater core, which I suspect you do, I usually will disconnect the hose at the heater core, and connect a drill operated pump from hardware store (about $10) to the heater core, and circulate C.L.R through it before putting it all back together. I usually set it up to pump through the core and back into a pail or similar, and then reverse the hoses to allow flow opposite way as well, then I plug lower inlet to core, and fill with C.L.R, and let it sit overnight if I have time, just to clean out as much calcium clogged up in there as I can. Saved me replacing 2 or 3 heater cores so far, that had little or no heat at idle, prior to cleaning, but had good heat after.

Posted on Dec 22, 2009

  • 11 Answers

SOURCE: heater blowing cold air with coolant, fine with plain water

it sounds like the heater core is clogged bad if u know someone with a air compressor put a air nossel on it that you pull the trigger to blos air in to the heater core after you take the lines off i had to do this before on a jeep cherokee it did the job

Posted on Jan 11, 2009

  • 4 Answers

SOURCE: heater only blows out cold air

Check the valve that controls coolant flow to the cabin

Posted on Feb 12, 2009

  • 85 Answers

SOURCE: no heat from heater

sounds like the thermostat is stuck. check this first. easier just to remove it and reinstall without one just to see if you get heat. If still not working then there needs to be a good flushing to be done. just make sure when you do a flush to leave heater controls to hot. if still not working then sounds to be like a bad heater core. you might need a professional flush which uses high pressure to blow out any clogs in heater core. hope this helps.

Posted on Feb 22, 2009

localwonder
  • 6784 Answers

SOURCE: My car heater is blowing cold air

The shut off valve on the heater core was left shut during the repair on your coolant system. the repairman forgot to re open the shut off valve . this is the problem. open the shut off valve and, the air will become hot again. as for the gauge fluctuations, the actual gauge may be malfunctioning.

Posted on Feb 24, 2009

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