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Old 11-04-2019, 12:06 PM   #1
Pinchlite
 
Drives: 2007 yaris HB
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No heat unless...

If I start the car I dont get heat untill throttle is touched.

The car can sit firever idling but heat will not come out untill I tap the throttle.

Never encountered this on any car before.Once the heat comes it is at normal hot temp.Could be thermostat issue?

UPDATE:

May be a faulty waterpump.I will try and findout how to diagnose and see if this issue.

Last edited by Pinchlite; 11-05-2019 at 11:06 AM.
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Old 11-07-2019, 06:23 PM   #2
myfirstyota
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Also check coolant levels.
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Old 11-07-2019, 06:26 PM   #3
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The white plastic container in back of the radiator seems to be at proper level.

I have read that air trapped could cause improper heat.
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Old 11-08-2019, 02:45 PM   #4
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That's exactly what I was thinking. Let the engine cool and pop the "rad cap". See if there's coolant in the hose.
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Old 11-08-2019, 04:08 PM   #5
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I dont not see coolant with cap off.I thought that was normal seeing reservoir was at normal level.
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Old 11-08-2019, 11:11 PM   #6
myfirstyota
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I think the air in the system doesn't allow proper flow of the coolant resulting in inadequate flow to the heater core. When you hit the gas, I'm guessing the water pump spins faster and forces some coolant to the heater core.

But that's my guess...
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Old 11-09-2019, 06:55 AM   #7
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I read you can take cap off and start engine to eliminate air?

Cold engine of course.
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Old 11-09-2019, 05:34 PM   #8
myfirstyota
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Yep. Top off coolant, Run engine till fan kicks on, top off again and cap on. That's how I bleed the air in my engines... unless there's a bleeder valve which I dont think the yaris has.
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Old 11-10-2019, 08:38 AM   #9
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Try squeezing hoses to help circulate and remove air. Fill radiator
to bottom of neck. Any excess will go to tank. Cap radiator after steady level is maintained.
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Old 11-10-2019, 12:24 PM   #10
Pinchlite
 
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Quote:
Originally Posted by myfirstyota View Post
Yep. Top off coolant, Run engine till fan kicks on, top off again and cap on. That's how I bleed the air in my engines... unless there's a bleeder valve which I dont think the yaris has.
I did this and heat is tip top!

Just curious wait till fan kicks on?
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Old 11-10-2019, 12:48 PM   #11
myfirstyota
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That's when you know for sure the thermostat has opened. That allows the coolant to flow through the engine pushing the air bubbles to the top of the system, which in the yaris's case is the 'rad cap'. Thus purging the cooling system of any air.
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Old 11-10-2019, 12:49 PM   #12
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thermostat has opened

Okay.Makes sense know.
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