what is causing my floor on my truck to get so hot when my heater is not on

55

Asked by Oct 22, 2016 at 02:40 PM about the 2001 GMC Jimmy 4 Dr SLT SUV 4WD

Question type: Maintenance & Repair

when i drive the truck for a while it seems like the feet heater is on but it is not
and it will get very hot and i never seen this before so i dont know what it is

6 Answers

my guess, possibly heat shield is missing on catalytic converter, or a exhaust component is too close to the floor pan

16,790

Or the blend door to the heater core is not closing all the way and sending heat to the floor vents.

77,715

You might want to have the management system checked. you might have a catalyst failure.

55

well i just replaced the thermostat on it because of the lack of heat out of the heater and the check engine light is on for the o2 sensor i still gotta do im thinking its probably the cat

16,175

All these trucks do this, they bypass heat when the vent selection is off. S10, sonoma, blazer, jimmy and bravada

77,715

If your not getting any heat out of the heater but the hoses are both hot in and out of the core then it is possible that you have a inoperative or broken blend door inside the heater box. So you have a check engine light for O2 sensor along with high radiant heat from the floor, so you could just replace the O2 sensors that are listed in the codes and hope it fixes it, or take it to a shop that can do "live data" scanning, the tech can see in actual time what is really going on and then tell you what it really needs.

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