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SUVs Toyota Highlander Toyota Highlander Heating Ventilation and Air Conditioning
107 messages, Last post on Nov 16, 2009 at 5:13 PM
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Here in the Las Vegas summer heat the A/C doesn't get the vehicle to cool as quickly as expected (+20 minutes). Has anyone else had similar problems?
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Replying to: khenkel (Jul 18, 2008 9:04 pm) I'd take it to the dealer as it has probably lost some gas. The Air Con is super efficient and copes well with Australian summers (similar to Nevada) so there sounds to be something not wrking correctly Cheers Graham |
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Replying to: khenkel (Jul 18, 2008 9:04 pm) There are times when Toyota's design engineers seem to be a little TOO concerned with passenger discomfort and "this" is undoubtedly one of those times. You can be cool the cabin down quickly by discomforting yourself briefly with system airflow that is a bit TOO cool. First, move the temperature setpoint to the COLDEST position. That should result in the blower speed going to the highest level once the A/C begins cooling the airflow. It will also, typically, result in the system switching to recirculate mode. If so then immediately switch it back into fresh mode and lower the rear windows an inch or so. The object of this "stage" is to move the "super-heated" airflow out of the passenger cabin and in the process hopefully reduce the interior surface temperatures slightly. Over time and trials you will begin to be able to judge when to switch to the next stage. Now switch the system to recirculate mode and lower the blower speed to adjust your noise intrusion comfort level. At this point the lower the blower speed is the lower will be the temperature of the system airflow. If you continue to need it cold, TOO COLD, in order to more quickly cool down the cabin then you might want to switch the airflow to footwell or mixed dash/footwell mode. I found it helped quite a bit cooling wise, COOLDOWN, to purchase and install a manual water flow shutoff valve in the engine coolant flow line to the heater core. That not only serves to bypass the reheat.remix mode of the HVAC system but results in a significantly lighter load for the A/C compressor and thereby an improvement in FE. |
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Not to disagree but the heater bypass valve should already be closed (actually, in bypass mode) when the temp is on "cool" and the outlets are not on defrost. To cool a car down quickly after sitting in the sun, 1st put down ALL the windows, switch the AC to NON-recirculate and the highest fan speed. After about 1-3 minutes of driving, roll up the windows and switch the AC to RECIRCULATE. Why? The fastest way to move the cabin temp down from 140 is to get it to 100 by rolling down the windows. Then let the AC take it from 100, instead of trying to make it work against 140 air.
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Replying to: kenlw (Jul 19, 2008 4:51 pm) If you mean the reheat/remix vane/door then it will only be fully closed, and REMAIN fully closed, with the system in the max cooling position. On the other hand if you mean the actual coolant flow valve then the beancounters have been successful in eliminating that feature some years ago now. If the hot engine coolant is allowed to flow through the heater core then the radiant heating effects can be rather substantially adverse to the cooling capability of the system. |
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Replying to: luckybelly (Jun 28, 2008 5:12 pm) Anything like this out there???
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Replying to: tonney (Aug 01, 2008 5:34 pm) Also my V6 is using excessive oil and has blue exhaust when started in the morning. My dealer insists on measuring the oil usage requiring me to take it to them periodically to measure oil. Last trip used a quart of oil in 500 miles. I'm aware of the slug settlement but my dealer pulled the head cover off and told me there was no sign of slug. It's not sounding like they want to help me. Anyone have any suggestions, please help. thanks.
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Replying to: irishcasey (Aug 01, 2008 9:05 pm)
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Replying to: texastoolguy (Aug 15, 2008 9:19 am) |
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Replying to: luckybelly (Jun 29, 2008 4:43 pm) Perhaps letting Toyota know may do something? http://toyota.custhelp.com/cgi-bin/toyota.cfg/php/enduser/ask.php?p_sid=3Yi8sVbj- &p_lva=&p_sp=&p_li=&p_accessibility= |
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