Question about Air Conditioning and Heat for Toyota Yaris

1 Answer

Heater hoses Car is fully heated but heater blows only slightly worm air. Checked both hoses that go from the engine inside of the car both equally worm but not hot at all.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

  • Expert
  • 157 Answers

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

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2001 Ford F250, have no heat, blows only cold air. Have changed heater core, thermostat is working properly. Have checked and tried everything it seems and still no heat.


Hi Shannon, IM AL the owner of Big As Auto Repair.

Shannon, it looks like you have ruled out the coolant side not heating properly with the thermostat replacement and coolant flow through the heater core because you replace it as well. Let's first make sure coolant is getting to the heater core. Here's an easy way to check this issue. Start the engine and drive it until completely warm then park and leave the engine running, open the hood and check each heater hose that is connected to the heater core at the firewall. If both hoses are equally hot then the coolant is getting to the core and working properly. If one is a lot cooler then the other then you could have a heater valve on the system "OR" a water pump flow issue. BUT, if they are equally hot, then you most like have a heater door issue inside a/c housing. If the heater door is not working properly and staying on the cold side you will not have heat. Lets stay in close contact buy you going to my auto-repair-website and work together. Just click on "CONTACT US" and I'll work with you until we resolve this issue. http://www.bigasautorepair.com/

Nov 27, 2016 | Ford Cars & Trucks

1 Answer

Heater not blowing hot air


when you operates the heater button worm water of your engine's water jackets enter to the evaporator locates inside your A/C blower & air flows through it & air becoming worm. Therefore I proposed you to check your vent linkages for vent doors inside the blower unit.

Nov 24, 2013 | Land Rover Range Rover Cars & Trucks

1 Answer

Heater in my car blows slightly worm air


no year stated. nor engine.
the engine must be 180F or more and hold
we use what is called a tool, called a thermometer,
we measure the engine heat first. at the thermostat housing
180F is typical. if not fix that first.
check fuses if the fan "blower" is dead , is it?
blows cold in all lever positions? hot + recirc, + defrost ,high or low vents?
all vents cold? (warm)

Nov 19, 2013 | Toyota Yaris Cars & Trucks

1 Answer

Heater wont blow hot on 2000 ford expedition


There are 2 systems for making heat in your vehicle. One is the water system and the other is the air ductwork.

Check both heater hoses for equal heat when the engine is at normal operating temperature. Careful not to burn yourself, but you need to grab each hose and compare the heat. If they are not equal, then your problem is water flow. There are flow valves which need to open to circulate the water through the heater core.

If both hoses are equally hot, then the problem is inside the cabin and in the ductwork. An air passage is blocked by an inoperable flap mechanism.

With some Digital Climate controls, self diagnostics is possible. You will really have to dig for the info on the Web or go to a Dealer. Certain keypad sequences can be entered to release the Codes. But the Code numbers are in a different table of Codes separate from the typical engine Codes. Depending on who made the Climate Control can affect how to do everything.

The net result for the diagnostics is to identify any small solenoids that are not opening the flaps in the ductwork, or other defects.

Please rate my info.

Dec 30, 2012 | 2000 Ford Expedition

1 Answer

Heater is not blowing hot air


How old is the coolant in your car? If you haven't changed the coolant in a couple of years, you may have sediment build-up in the heater core that is restricting full circulation in the core and preventing good heat output. Feel both hoses at the firewall that go to the heater core. Are both equally hot when the engine is warmed up and heater controls on high? If only one is hot, and the other lukewarm, the core is partially plugged. Pull off both hoses there and run a garden hose at low volume backward through the core. If not sure what is backward flow just run the garden hose through both openings and see if you can remove any sediment or blockage.
If both hoses are hot, the core may be circulating fine, and the problem may be in the heater case's doors not opening fully- I think that would be the temperature blend door. When heater controls on full heat, the door should be fully open to let blower air pass across and through the heater core to pick up heat and pass on through to vents.

Dec 20, 2012 | 2002 Kia Sedona

3 Answers

2001 Dodge Caravan heater blows cold air when stopped


Have you checked the coolant level? What you describe is exactly what happens if the coolant level is low. When stopped at idle, hot coolant is not circulating through the heater core, so no heat. As the engine increases in rpm's when you pull away from the light, the water pump is spinning quicker, and some coolant is making it to the heater core. So check the level, and if it is low, keep an eye on it to see if it drops again. That of course indicates a leak somewhere. Get it fixed, as overheating the engine leads to costly repairs and worse case a new engine. Let me know how you make out with this.

Dec 05, 2009 | 2001 Dodge Grand Caravan

3 Answers

No Heat!!!!!! I


first, you need to check if you have coolant in the reservoir, if it is very low or none, then you need to top it up and bleed the system by undoing a hose clip, preferably a heater hose, and pull it away slightly so it starts to leak, you should see air come out, when its just coolant , refit and tighten the hose clip. run the engine and see if it blows hot. You should also check to see where the water leaks are and rectify them.
Hope this helps

Nov 30, 2009 | 1998 Ford Windstar

1 Answer

Heat will not work air work fine cannot get heat to come on blow cold air


Check to see if your heater core is stopped up. To do this, start the car and warm up the engine. Turn the heater on and turn the temp up. Raise the hood and locate the two heater hoses on the passenger's side going through the firewall below the windshield. Feel both hoses with your hands. If one is hot and one is cool, then the heater core is stopped up. Turn the engine off and let it completely cool. Disconnect the two heater hoses and blow through one and then the other with an air hose till it is clear. Reconnect heater hoses. If this is not the problem, then listen for a clickin noise behind the dash while the car is running and the heater of air is on.

Oct 04, 2009 | 1997 Lincoln Town Car

13 Answers

2006 Chevy Impala Heater only works when accelorater is depressed


Impalas are known for this issue, where the heating won't work properly.... usually caused by trapped air/bubbles in cooling system or slightly low coolant level. Park car so that the right front side is elevated and remove the coolant OVERFLOW bottle cap (NEVER the radiator cap) while engine is running.. This should allow the trapped air to escape. Also add a bit more coolant if needed.

Dec 25, 2008 | 2006 Chevrolet Impala

Not finding what you are looking for?
Air Conditioning and Heat for Toyota Yaris Logo

98 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Vehicle Parts & Accessories Experts

Randy Ohler

Level 3 Expert

14585 Answers

ashburton

Level 3 Expert

417 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

Are you a Toyota Vehicle Part and Accessory Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...