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Toyota Avalon Climate Control Questions



  • my avalon recently started running on low even when i switch it manually to high. sometimes it will go to normal speed then to low and repeats. no pattern to it just random. checked the blower and it's fine. i've read that the xls does not have a resistor but then i have no idea what would cause this. any ideas would be greatly apprecciated.
  • Anyone know if the '95 Avalon XLS has a cabin filter behind the glove box, like later models?
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 44,404
    Not it doesn't. That's comes in about 1999 on the Avalon I think.


  • A/C blowing hot air. Going to take it to an independent shop, but wanted to see if there are any issues that might cause this besides needing a new compressor. Any Ideas??

  • jeal1jeal1 Posts: 4
    I posted this question in the 2008 Toyota Avalon section and then came upon this forum. So, here it is again.
    When I set my Avalon's passenger temperature to anywhere between 74 and 80, the back vents blow out air at 107 degrees which makes it impossibly hot for anyone in the back seat. The passenger in the front has to freeze or the back seat passengers have to burn up. Anyone else having this problem?
  • tjc78tjc78 JerseyPosts: 5,025
    I don't think its a problem at all. From what I remember from when I had my '06 Avalon that is just the way it works. FWIW I never had to set the heat above 68-69 or the car blew me out of there it was so hot.

    1999 Chevy S10 / 2004 Merc Grand Marquis / 2012 Buick LaCrosse

  • I am hoping someonce can help or has worked through this. My wife drives a 1997 Avalon XL. Has about 130k. The car gives very little heat. The engine does not overheat. The AC works fine. However, you have to be driving for a while with airflow on recirculate to build up any significant heat. I've had the timing belt and woater pump replaced just this past summer (July 2009). I use long life coolant whcih is reccommended by the dealer and there are no coolant leeks.
    Please help! My wife hates the cold!!

  • finfin atlantaPosts: 588
    Here's some general thoughts, others will have to give you more exact details. Your cooling system works, the car operates and does not overheat or leak. That means the warmed coolant is not getting to the heater core that allows the heat to be blown to the interior of the vehicle.

    There is a control valve that diverts coolant to the heater core. This valve is not opening. Or the hose to it is stopped up due to age. Or the heater core is plugged in places with residue. Or the control switch is not telling the valve to open. Or the return line from the heater core is plugged. Or a combination, this is a 13 year old car. (It's not the coolant or the water pump.)

    A coolant flush with the new pump should have revealed the problem. But if you just had this work done and have never had the problem before, the repairs may have caused the problem. In order of simplicity, step one might be to ask the dealer to check his work and see that all lines and wires have been properly re-attached. After that, check the valve and hoses. Last, look to the heater core. Hope this helps...
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 44,404
    Aside from the possibility of a defective heater valve (good guess!), did they replace the thermostat at the same time as all the rest? If not, they need to be slapped. :P


  • wwestwwest Posts: 10,706
    I will assume the heating was fine until last summer so your most likely problem is a "void", vapor lock", air bubble, in one of the hoses to/from the heater core. When the coolant was being refilled enough "care" was not taken to avoid this.

    Toyota has not used a heater core water flow shutoff valve for many years now, going back to the early 90's..
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 44,404
    It's called a "water control valve" and is cable operated, but wwest is right, it's not at the heater core, but in the engine bay.


  • finfin atlantaPosts: 588
    YES ! Thinking outside the box.... My focus was on the heater and controls but a defective t-stat, stuck open or other malfunction, could produce the same symptoms with all else working OK. It would also lower gas mileage slightly as the engine will never hold optimum operating temperature in winter. :)
  • wwestwwest Posts: 10,706
    You might want to check first and be sure the water control fully opens when you move the control to MAX heating. Valve is close to the firewall in one of the heater hoses.
  • Ah! Toyota Avalon and its bloody stupid heating and cooling system.
    My 2001 has perfect air conditioning but heating is garbage...went to dealer and they say these cars don't heat too well. Big problem is that the car heats sort of o.k on the drivers side, but passenger freezes.
    The dealer wanted $ 3000.00 to replace some flap that does not open or close close to the heater core. I think it is shameful of Toyota to not own up to this obvious bad engineering.

    Anyway, you say the heat does come but only upon recirculation. That tells me that the the heater core is not warming up enough for the fan to blow hot air over it but keeping stale air in does a bit of a trick.

    I would try and find the highest degree or "hottest" marked thermostat I can find and install it. Someone suggested it and I am certain that the thermostat is old and is stuck in an open position.

    I am always a bit ticked off when someone says " hey, the car is 13 years old"
    So what! I have a couple of cars that are 17 and 22 years old but apart from some routine parts like water pumps, alternator etc...I have never had to piss around with this dual air climate nonsense that Toyota suffers from. My 19 year old Audi never ever had heating or cooling problems. :blush:
  • Thank you all so much!! I am re-reading the posts to see what the best course of action is. I made a mistake in my post. My wife's Avalon is a 1999 not a 1997.
    I was thnking about my truck for a moment. Sorry.
  • my wifes 98 avalon is having trouble with the blower, it only works on low now. it was working intermittently but stopped doing that too. i tried replacing the blower relay did nothing. tried replacing the blower, nothing. just don't know what else to try. it has the automatic climate control, should i replace the controls? any ideas would help tremendously.
  • boxstackerboxstacker Posts: 1
    While making slow left turn in 08 Avalon my AC or heat turns off .. Dealer claims I accidently shut off ... this happens daily..and always at slow speed.
  • I have a 96 avalon that i bought 6 yrs ago. I have never had any problems until now. My a/c had always almost overworked. Making my car very cold. now it only works maybe 2-3 days then gave out very little air for about a month.
    When i would drive it and make turns i could hear water swishing but could not tell where it was coming from.
    I wonder if anyone else has experienced this. If so, could you tell me short of taking it to a mechanic what was done to fix it.
  • I own a 2007 Toyota Avalon and am having the following problem.

    When the car is stopped at a traffic light or in park and the AC is on, the RPMs will fluctuate. RPM will increase by 250 - 750 above idle every few seconds and then drop.

    The symptoms go away when the AC is turned off or set to MAX Cold Temp and High Fan. Fluctuations are greater when the AC fan is set to its lowest speed.

    Any ideas?

  • wwestwwest Posts: 10,706
    SOP, the engine "idle" RPM is changed as the A/C compressor clutch cycles, engages and disengages due to refrigerant flow demand. Lower blower speeds, in general, make the system more efficient and thus longer cycles.
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