HVAC not working?

Tiny
RAYKRAYK
  • MEMBER
  • 2005 TOYOTA CAMRY
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
Both the heater/AC do not work no heat/cool. The blower is okay. This has the auto temperature system.
Wednesday, December 6th, 2017 AT 11:57 AM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,452 POSTS
As the blower motor is working the first items to check will be the two fuses in the system that provide power to the control head.
Quick way to test fuses AND verify that there is actually power at them is to use a test light. https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester Connect it to a good ground and just touch the small tabs on each side of the fuse to see if there is power on both sides. Power on one side only = blown fuse.

There is a 10amp HTR fuse in the panel at the left end of the dash and a 10amp ECM-B fuse in there as well. Test both of those.

If both test OK then it is most likely a bad control head. That is because failure of one of the temperature sensors won't shut the system completely off.
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Friday, December 8th, 2017 AT 3:19 PM
Tiny
RAYKRAYK
  • MEMBER
  • 2 POSTS
Steve: Thanks for the info, My heater seem to be working now but no ac cooling, I will check out the fuses next week, From the owner manual, I couldn't locate the ECM-B fuse Ray
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Saturday, December 9th, 2017 AT 11:16 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Hello,

Here is a guide and a diagram to help you get the job done sorry for the delay.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken
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Saturday, December 16th, 2017 AT 12:48 PM

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