Question about 2003 Toyota Highlander

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Check engine light came on and the code shows P0440. Also, the air conditioner and heater both work but to get cool air I have to find one certain a spot on the temperature dial otherwise it blows out very hot air. Once I adjust and find the one click that will work the AC works fine but if I move it to any other position it is just hot air. Could the two be related? The check engine light and the air problem have both been going on for about a year so I dont remember if the check engine light came on first on at the same time or after the air started messing up. Everything else has been driving and working great.

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First, I highly doubt that the two problems are related. The code P0440 is associated with the EVAP system. In many cases, this code is set when the gas cap is not securely tightened or its sealing gasket has failed. Replacing the gas cap is a quick, cheap fix. If that doesn't resolve the problem, you either have a leak in the EVAP system tubing or the purge solenoid has failed. The EVAP system is supposed to create a vacuum to siphon gas fumes from the fuel system to a purge canister. Periodically, the purge solenoid opens and allows these fumes to be routed to the engine and burned. Look at this link for an explanation: http://www.obd-codes.com/p0440

Good luck.

Posted on Oct 11, 2013

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The code can be found in a repair manual u can look it up.that`s probly what made your check engine light come on.the code most likely is a sensor that needs to be replaced.the switch on your temp dial is just possibly a bad switch.I don`t think the two r connected at all.

Posted on Oct 11, 2013

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Posted on Jan 02, 2017

Brian032472
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SOURCE: Frequently loss the coolant and

You are losing coolant if you have a coolant pressure tester follow the directions and use it. If you don't when the car is cool use a 50/50 solutuion of water and coolant fill system and check all the listed items carefully with a flash light and look for leaks. It is either a bad hose, cap, water pump or radiator. Your coolant circulates through the dash and the blower blows throught the heater core to produce heat. No coolant no heat. I would also check the passanger side floor for anti freeze or moisture could be a leaking heater core also.

Posted on Nov 02, 2008

jmassengill
  • 345 Answers

SOURCE: obd code p0440 for check engine light on 2000 Toyota Corolla

p0440 code means that the evap system has a leak. This could be caused by a bad or improperly installed gas cap. Either that or the purge solenoid has failed or the canister is plugged and not working properly.

Posted on Nov 15, 2008

  • 10 Answers

SOURCE: Heater does not work and check engine light is on

Please see
http://www.tundrasolutions.com/forums/highlander/32217-heater-quit-sort-of/
It's usually broken solder joints on a cable behind, and feeding, the temperature knob.
I repaired my 2002 Highlander yesterday thanks to this site.

Posted on Jan 21, 2009

  • 92 Answers

SOURCE: 2000 toyota camry check engine light is on code P0128

if you are refuring to the yellow check engine light. thats an emmision control light, it's not related to
oil or water capacity. it has only to do with emmision control devices. if the light is on steady. bring it to your mechanic and have him or her pull codes from your on board computer as soon as possible. if the light is flashing bring it to them now. stop driving the car or damage will be done to your cars converter.
good luck chris

Posted on Mar 22, 2009

  • 160 Answers

SOURCE: Sporadic cooling by AC on 2001 Toyota Camry 4cyl

SEE WHAT COLOR THE AC MAG CLUTCH RELAY IS / UNDER THE HOOD RELAY BLOCK IF IT IS WHITE TRY REPLACING IT WITH ONE OF THE BLUE ONES IN THIS SAME BLOCK (HORN RELAY) IF COMPRESSOR ENGAGES REPLACE WITH TOYOTA UPDATED RELAY ( PLEASE RANK THIS)

Posted on Apr 19, 2009

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