Winter and Heater (A/C) - Toyota Yaris Forums

Rick · 03-23-2010, 10:02 AM

This isn't legal proof, but it's there if you have the 'All Weather Package'. The factory manuals (I have them) cover it extensively. I have seen that my Base Yaris with 'All Weather Package' has the special AC computer with the extra connector. It's additional power wiring for the PTC heater element. From a Yaris perspective it does draw a prodigious amount of current when active. It's only active when the heat is set to max, the blower fan is on, the engine coolant is < 150F, and ambient temps are below 50F. You can see it's effect on system voltage with a Scangauge.

Search for 'How does a PTC heater work?' and you'll stop expecting to smell it or overtly feel it. It just speeds up the warming. I can definitely tell it does that where I live.

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03-23-2010, 10:02 AM	#22
Rick Drives: '08 Yaris LB 5M Join Date: Nov 2008 Location: MN Posts: 31	This isn't legal proof, but it's there if you have the 'All Weather Package'. The factory manuals (I have them) cover it extensively. I have seen that my Base Yaris with 'All Weather Package' has the special AC computer with the extra connector. It's additional power wiring for the PTC heater element. From a Yaris perspective it does draw a prodigious amount of current when active. It's only active when the heat is set to max, the blower fan is on, the engine coolant is < 150F, and ambient temps are below 50F. You can see it's effect on system voltage with a Scangauge. Search for 'How does a PTC heater work?' and you'll stop expecting to smell it or overtly feel it. It just speeds up the warming. I can definitely tell it does that where I live.