No heat for 2 - 3 minutes after my 2013 hybrid start.
02-25-19, 01:11 PM
#1
Driver School Candidate
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No heat for 2 - 3 minutes after my 2013 hybrid start.
Greetings,
My 2013 ES300H heater stopped having instant heat after start. I must now wait for the engine temperature to warm before I get any heat, which takes 2-4 minutes. I have two relays, PTC #1 and PTC #2 for the Positive Temperature Coefficient (heating elements) in the ducting. Does anyone have the relay internal circuit and how to test it? There is also a 7.5 amp fuses in the system which is good.
Thank you in advance for your assistance.
Scott
My 2013 ES300H heater stopped having instant heat after start. I must now wait for the engine temperature to warm before I get any heat, which takes 2-4 minutes. I have two relays, PTC #1 and PTC #2 for the Positive Temperature Coefficient (heating elements) in the ducting. Does anyone have the relay internal circuit and how to test it? There is also a 7.5 amp fuses in the system which is good.
Thank you in advance for your assistance.
Scott
02-25-19, 04:07 PM
#2
Pole Position
I am confused. Our past hybrids, as well as the current ones, do not produce heat until there is warm water in the radiator. I do not understand your statement of “instant heat” as we have never experienced that. Ours have always worked as yours currently functions - so I don’t have a solution. I would like to hear how more about this as you troubleshoot so please keep us posted.
02-25-19, 05:06 PM
#3
I am confused. Our past hybrids, as well as the current ones, do not produce heat until there is warm water in the radiator. I do not understand your statement of “instant heat” as we have never experienced that. Ours have always worked as yours currently functions - so I don’t have a solution. I would like to hear how more about this as you troubleshoot so please keep us posted.
02-25-19, 06:00 PM
#4
Intermediate
PTC stands for Positive Temperature Coefficient and refers to the electrical resistance of the heating elements in the seats. With a positive temperature coefficient, the resistance of the heating elements goes up as the temperature goes up due to passing an electrical current through them. This type of heating is more comfortable, efficient and reliable than the typical heating elements that have a negative temperature coefficient. But, the point as relates to the battery, is that cars with PTC seat heating are equipped with a cold weather package and require a more robust battery to support mirror heating, seating heating, windshield heating, etc.
02-25-19, 06:18 PM
#5
Lead Lap
Your hybrid is no different than my non-hybrid ES 350. The radiator water must heat and run thru a heater core to produce heat. Your climate control won't even start until the water reaches an established temp. Then the blower will engage and you get warm air. I think your heater is working properly.
02-26-19, 12:07 PM
#7
ES300 PTC information
Scottsail2 is correct, ES300h's have an electric heating element that provides warmed air while allowing the
IC engine to cycle off and on. Here are a couple of pages that will hopefully help diagnose the issue.
IC engine to cycle off and on. Here are a couple of pages that will hopefully help diagnose the issue.
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02-26-19, 01:35 PM
#8
Lead Lap
I learned something new today. Not the same as a non-hybrid. Had no knowledge about the electric heating element. Thank you for the correction and information...
02-26-19, 06:47 PM
#9
So this is strange. I have a hybrid and when the engine is cold and I get to a stop light the engine does not stop running when I am stopped and the heat is on. Sometimes the engine sound bothers me because I am now used to the engine being off at stoplights. So the 100% sure way of shutting off the engine when it is cold is that I simply turn off the heater fan. The engine turns off then. Always. If the ESh was electrically heated when the engine is cold, then why does this happen, i.e. engine runs when it is cold and shuts off if the heater fan is turned off. I always figured that the engine was only running to provide heat into the car.
02-26-19, 07:46 PM
#10
Lead Lap
So this is strange. I have a hybrid and when the engine is cold and I get to a stop light the engine does not stop running when I am stopped and the heat is on. Sometimes the engine sound bothers me because I am now used to the engine being off at stoplights. So the 100% sure way of shutting off the engine when it is cold is that I simply turn off the heater fan. The engine turns off then. Always. If the ESh was electrically heated when the engine is cold, then why does this happen, i.e. engine runs when it is cold and shuts off if the heater fan is turned off. I always figured that the engine was only running to provide heat into the car.
02-26-19, 09:36 PM
#12
Pole Position
The ICE cycles on and off to keep the engine/water at a certain temperature. For example, in eco mode it doesn’t work as hard to maintain the temperature as it does when in sport mode. So in sport mode the ICE runs more when stopped than it does in eco mode.
Last edited by TechNut; 02-26-19 at 09:42 PM.
02-27-19, 04:42 PM
#13
Lexus Test Driver
Does your car have a special cold weather package? My hybrid takes a while to warm up in Eco mode but it's faster in Normal. I'll check whether there are OBD PIDs for these heating elements.
02-27-19, 06:03 PM
#14
Intermediate
02-27-19, 06:45 PM
#15
Lexus Test Driver
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