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Matt
Matt, Mechanical Engineer
Category: Toyota
Satisfied Customers: 20592
Experience:  BEng hons Mech engineering, in auto industry 22 years
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toyota yaris havin problems with heater have changed thermostat

Customer Question

toyota yaris havin problems with heater have changed thermostat water pump all controls seem to be working but only getting low temperature coming out of heater
Submitted: 2 years ago.
Category: Toyota
Expert:  Shantal-Mod replied 2 years ago.
Hello,

I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.

I wonder whether you're ok with continuing to wait for an answer. If you are, please let me know and I will continue my search. If not, feel free to let me know and I will cancel this question for you.

Thank you,

Shantal
Customer: replied 2 years ago.

thank you Shantal yes i would like you to find someone to answer this problem

Expert:  Shantal-Mod replied 2 years ago.
Hello,

Thank you for getting back to me. We will continue to look for a Professional to assist you.

Thank you for your patience,

Shantal
Expert:  Shantal-Mod replied 2 years ago.
Hello,

I apologize as we have not yet been able to find a Professional to assist you. Do
you wish for me to continue to search for someone to assist you or would you
like for us to close your question at this time?

Thank you for your patience,

Shantal
Expert:  Matt replied 2 years ago.
Hello


If you're sure the motor is getting up to temperature have a feel of the two coolant pipes that pass into the car through the engine bay bulkhead, both should be warm with a warm engine.

If they're not then its likely the heater matrix is blocked and you should do a reverse flush on the cooling system to try and clean it out. This is done by removing the top hose from the radiator and placing a garden hose into the engine water outlet, and then run the hose until you get clean water coming out of the radiator.


If this doesn't help this only leaves checking out the motor / cable that move the air mixing flap that allows the hot air from the matrix to enter the car air system.

This flap is controlled by the temperature knob / dial etc and I think is controlled with a small motor for your car so the thing to do is first get access to the back of the control knob and measure the voltages is present there, then trace the wiring back into the dash from the control to locate the motor.

It’s worth first checking the fuses for the fan / control circuit

I'd recommend first removing the glovebox ( undo lower edge hinges from dash) to gain access to the dashboard inner and also allow you to shine a torch to the back of the central console so you can start tracing the wire back and see how things are put together

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