2005 Corolla Verso Heat works for a while

[SparHawk]

Hi!

im searching for either info on cabin air tempsensor or a schematics for hvac system

my 2005 corolla verso 1.8 vvti has a strange fault where heating works perfect until cabin gets to set temperature but the it starts to cool off and blows only collder air, if you upp the temp it starts heating again but then after a while same thing happens. really annoyin on longer trips...

my thought is that where ever the cabin air temp sensor is is somhowe not reading correct or something.

had a similar issue on a mitsubishi legnum and it had a venturi style system where a hose that sucked air from centerconsole went trough a sensor and managed the heating system.

havent been able to find where the sensor is on the toyota.

any ideas? sorry for the long post 😃

 

-Mikko Kuusisto- from the frozen Finland