Question about Toyota Yaris
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)
Posted on Dec 13, 2014
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Posted on Jan 02, 2017
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.
Posted on Dec 05, 2009
Testimonial: "Thanks Curt! You were right ON!"
also check to see if tube that runs your climate door is not pinched or broken. the vaccum tube that runs the climate door is behind and under the battery. i had same problem a year ago and the tube was partially cut. i fixed it by cuttinga piece of aquarium tubing and spliced it back together. one other thing.....check to see if your radiator over flow cap is tight. your cap maybe bad and or cracked this would also cause the problem.
Posted on Jan 29, 2010
Hi check water pump for leak and all hose connection then make sure the coolant is full then pressure test the system most leaks are from hoses and water pump not many with block and radiator. be sure to change oil when you get it fixed, consern is oil vescosity. hope this is helpful.
Posted on Feb 01, 2010
SOURCE: heater only blows worm air
Check these three possibilities: One, car has a bad thermostat. Two: Car has a bad heater control valve and three: Car has a vac leak under the dash that controls the heater Flap Valve. If this flapper isn't closed completely, cool outside air mixes with the warm inside (recirculating) air and cause a lukewarm air mixture at the vents.
Posted on Oct 24, 2010
Tips for a great answer:
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BLOWING COLD,NO HOT AIR FROM HEATER,A/C BLOWS HOT AIR,A/C NOT BLOWING COLD,
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