A/C runs in winter with heat on.
#1
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Join Date: Oct 2013
Location: MN
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A/C runs in winter with heat on.
I have a 1999 LS 400 with 186k miles. I just had the cam shaft and crank shaft sensors replaced as the car would turn over but not start. Seems to have resolved the issue. However the mechanic noticed that when the heat is on the a/c is running also. So he unplugged the A/C as it is winter here in Minnesota. Has anyone encountered this issue and know the cause of it?
#2
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iTrader: (7)
if you have your vent setting on front windshield defrost, the AC will automatically turn on with the fan. this is normal, and useful for defogging the front windshield during cold weather. there is something in the AC properties that aid in defogging, and it's NOT the cold air that does it. you can have your heater on full blast and it will still defog with the AC on!
heat will always overpower the AC cold. i would have your mechanic reverse what he did.
heat will always overpower the AC cold. i would have your mechanic reverse what he did.
#6
Driver School Candidate
I noticed this almost immediately in my 2003 ES300. The hubby mentioned what you guys did and also, if you have it set to automatic...it will attempt to keep the temp you have it set for if that requires heat or AC. I think that's how it works, any way.
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#10
Lead Lap
Nope. The A/C can come when "Auto" mode is selected regardless of whether or not the HVAC is in defrost mode as long as the outside temperature is above a minimum ... something like 32 degrees Fahrenheit.
#11
Lexus Champion
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I use auto all the time and mine works like Jim just said and I agree with the guys, find a REAL mechanic, yours is a beginner..... and auto keeps my windows clear also... because if I reach over and turn the AC off, they start clouding up... wow my brilliance keeps coming out.. (hehehe)
Last edited by billydpowe; 01-07-15 at 07:28 AM.
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