Question about Air Conditioning and Heat for Toyota Yaris
Start by identifying engine size and auxillary extras on this car for us all. basic thought... is the coolant level full??? and any air bubbles purged from the system? now measure the coolant temperature. now the heater duct temperature. identify the components in the system. locate and inspect them. now you must find any control for the coolant to flow or not flow. or flow at a reduced rate. is there a heater control valve on your car? is it cable operated or do you have automatic temperature control? or is it vacuum operated? toyota products i have experience with use a cable operated valve located at the entrance to the heater core. this is at the firewall,or, bulkhead .behind the engine on most front engine, front wheel drive cars. There is a wire type cable that operates a lever. its adjustable when its snapped into place. these often bind up when they are exposed to weather and miss their maintenance. Try to lubricate and readjust the wire. With it disconnected, operate the lever and turn it both directions. Take new duct temperature measurements and compare them to the readings you got before. Is the coolant temperature of the engine at operating temperature? Did the duct temperature change? Are you familiar with the components used on your car? If your system uses different parts and method the principle is still the same. Get it to let the coolant pass thru and circulate till it takes on the same temperatue as the engine. You can also report your findings so far. There are service bulletins for technicians available at your local library... for free!. also, ask for service manual information regarding your system. Follow safety recommendations. Protect yourself and your vehicle as you go. Be sure your engine cooling fan operates in cycles to cool the engine. If the coolant temp is below operating temp specification, your thermostat is possibly stuck open. Be sure your heater blower operates as designed. Several speeds are the norm. There has been no recent change to the controls on the instrument panel... like the warm/cool lever wont go all the way over to warm anymore... this tells you the cable is out of range. On automatic systems, the controller uses sensors to decide before actuating. Your car may need professional help. So you see, there's a ton of information required for the technician to test and consider or look up. When you are satisfied the coolant is flowing and the blower is running, there is the matter of temperature mode doors in the heater A/c system. They control airflow. The temperature blend door is often cable operated and adjusts like the control valve. If not, there's vacuum operated ones or the kind with electronic actuators. At any rate, it has to be open to let the air flow thru the heater core. Verify and identify this as well. There are also fresh air /recirc doors on these systems if yours is stuck open then cold ambient air is its supply. That will reduce the duct temp considerably.
Posted on Nov 19, 2013
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Posted on Jan 02, 2017
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