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Car Forum / Toyota / Toyota Cars / February 2007New 2006 Sequoia Heat Not Working Properly
Ok this I think is a weird one but I'll do my best to explain it. I noticed this issue a week or so ago when we had a very cold day and snow. I went out and started the truck and set the temperature to 70 degrees. About 15 20 min later I want out and the inside of the care was still ice cold and the air blowing out of the system was cold. The fan was blowing full blast and the lower vents were selected as you'd expect. I pulled out and while drive off I turned off the system and then hit the auto button and heat came out as expected. So I didn't think much of it and it seemed to work fine until today, another cold day. I drove it a few miles and it didn't seem to warm up inside. I tried the turn it off trick again but that didn't work. I then used the mode button to cycle through the vents and when I hit the dash vents the it started out cold but then the heat started coming out. Back down to the floor and cold air again. Then through a series of button pushes it seemed to work better but it never warmed the truck up to the 70 degrees I had it set to. Tonight I went out to fool around with things and it seemed to be even stranger. I turned on the car and let it idle expecting for it to warm up and then heat come out. Well heat never came out. This time I noticed that the temp guage on the dash steadily climbed to just a couple of notched below the red mark. After several minutes I put the truck in gear and started around the block, After a minute or two boom heat came out of the system and the temp gage on the dash dropped. Went around the block and parked and sat for a while and the heat went from hot to luke warm. Certainly wouldn't warm the truck up to the 70 degrees the system was set for. So I'm thoroughly confused. and very worried about the temp gauge. I didn't notice the temp gauge a week ago when the car sat idle and never warmed up inside. To add insult to injury, the real system never blows hot. The fan stays on medium to high and blows cold air. Anyone have any idea what may be going on here? It has me befuddled. No heat but the engine temp is just about in the red. All very strange. Any help would be greatly appreciated. -- Rob "A disturbing new study finds that studies are disturbing" > Ok this I think is a weird one but I'll do my best to explain it. > [quoted text clipped - 37 lines] > > Any help would be greatly appreciated. Sounds like a blockage in the system somewhere. And getting "a couple of notches bleow the red mark..." is not a good sign at all. I would definitely bring it over to the dealer. My temp guage didn't start acting like that until I had about 100,000 miles on the car, and the system needed a good flushing. >> Ok this I think is a weird one but I'll do my best to explain it. >> [quoted text clipped - 48 lines] > acting like that until I had about 100,000 miles on the car, and the > system needed a good flushing. I was thinking possibly a stuck or sticking thermostat but the damn thing is brand new. -- Rob "A disturbing new study finds that studies are disturbing" >>> Ok this I think is a weird one but I'll do my best to explain it. >>> [quoted text clipped - 52 lines] > I was thinking possibly a stuck or sticking thermostat but the damn thing > is brand new. It is rare on a Toyota for parts to go bad very soon, but the thermostat is a high-failure item! (In general, that is...) > Ok this I think is a weird one but I'll do my best to explain it. > [quoted text clipped - 42 lines] > Rob > "A disturbing new study finds that studies are disturbing" We have never had any issues with the 2 zone automatic HVAC system in our 2003 Sequoia. The symptoms point to a stuck thermostat but that is unlikely in such a new vehicle. I would let the dealer experience and diagnose the problem.  SignatureRay O (correct punctuation to reply) >> Ok this I think is a weird one but I'll do my best to explain it. >> [quoted text clipped - 47 lines] > unlikely in such a new vehicle. I would let the dealer experience and > diagnose the problem. Well its going in as soon as I can get it in. My only other thoughts over a thermostat is semi frozen fluid, air, or some sort of crud form assembly. -- Rob "A disturbing new study finds that studies are disturbing" well I guess you checked the fluid level but with the temp going up I would guess the thermostat. It could also be a control panel issue but that is not likely. > Ok this I think is a weird one but I'll do my best to explain it. > [quoted text clipped - 42 lines] > Rob > "A disturbing new study finds that studies are disturbing" > well I guess you checked the fluid level but with the temp going up I > would guess the thermostat. > It could also be a control panel issue but that is not likely. It was dark outside the last time I looked at the issue so I'll double check the fluid in the morning. -- Rob "A disturbing new study finds that studies are disturbing" Ok checked this morning in the daylight and the resivour was empty. Filled it up and looked into the radiator and it also looks empty, at least empty from what I'm used to even after running the car to operating tempeture. Questions. Shouldn't I see coolent in the radiator? I'm used to warming the car up until the theromstat opens and filling the radiator until you can see coolent at the top. Is this still true with this truck? BTW: after driving the truck the same levels were in the resivior and the heat worked. Except the rear heat. It still blows cold air. Does the rear heat use the engine coolent to work or does it have its own system? -- Rob "A disturbing new study finds that studies are disturbing" > well I guess you checked the fluid level but with the temp going up I > would guess the thermostat. [quoted text clipped - 46 lines] >> Rob >> "A disturbing new study finds that studies are disturbing" Sorry forgot to hit the spell check button before the send button. ;-) -- Rob "A disturbing new study finds that studies are disturbing" > Ok checked this morning in the daylight and the resivour was empty. > Filled it up and looked into the radiator and it also looks empty, at [quoted text clipped - 67 lines] >>> Rob >>> "A disturbing new study finds that studies are disturbing" > Ok checked this morning in the daylight and the resivour was empty. > Filled it up and looked into the radiator and it also looks empty, at [quoted text clipped - 10 lines] > heat worked. Except the rear heat. It still blows cold air. Does the > rear heat use the engine coolent to work or does it have its own system? I don't know about rear heat, so I won't venture to guess. But, the Overflow bottle should be at the lavels marked on the bottle, and collant should cover the radiator core. I believe this vehicle uses the pink stuff, get it from Toyota. If all they have is the diluted stuff, add it to the radiator cold and then start the car and wait. Add more as needed to fill the radiator. put some in the bottle to cover the bottom of the hose and close the radiator, then watch the bottle. Add until it stabilizes and then fill to the HOT mark and close it. I would look for hoses running to the rear heater. I had a Ply Grand V'Ger with rear heat, and one of the hoses burst and lost all the coolant from the engine. Luckily, since I watch the temp guage all the time, I stopped the engine when it look abnormal and saved myself a lot of grief! > -- > [quoted text clipped - 52 lines] >>> Rob >>> "A disturbing new study finds that studies are disturbing" >> Ok checked this morning in the daylight and the resivour was empty. >> Filled it up and looked into the radiator and it also looks empty, at [quoted text clipped - 24 lines] > the engine. Luckily, since I watch the temp guage all the time, I stopped > the engine when it look abnormal and saved myself a lot of grief! Ok just to make sure I understand. Not only do I need to fill the reservoir bottle but I should also fill the radiator until I can see fluid at the top over the radiator core when the system is cold. As to the kind of coolant, I read the manual and it says Ethylene Glycol. Yes the coolant in the car is the red stuff but the only think I can get right now is Peak which is the same Ethylene Glycol but its green. Does that really mater? I've already filled the reservoir with the Peak stuff. I believe the rear heater is electric and on a fuse. I've found the fuse but it seems to be some special block instead of a normal fuse. Figures. :-/ -- Rob "A disturbing new study finds that studies are disturbing" >>> Ok checked this morning in the daylight and the resivour was empty. >>> Filled it up and looked into the radiator and it also looks empty, at [quoted text clipped - 31 lines] > reservoir bottle but I should also fill the radiator until I can see fluid > at the top over the radiator core when the system is cold. Set the heater to full hot and fill the radiator until the coolant in the radiator neck covers the hole for the tube that goes to the overflow bottle. > As to the kind of coolant, I read the manual and it says Ethylene Glycol. > Yes the coolant in the car is the red stuff but the only think I can get > right now is Peak which is the same Ethylene Glycol but its green. Does > that really mater? I've already filled the reservoir with the Peak stuff. Not such a good idea to mix Peak with the red stuff. The coolant will end up a dirty borwn color, making it difficult to visually check coolant condition, and silicates in the Peak will contaminate the silicate-free red stuff. > I believe the rear heater is electric and on a fuse. I've found the fuse > but it seems to be some special block instead of a normal fuse. Figures. > :-/ If the rear heater is electric, check for power going into the heater element. SignatureRay O (correct punctuation to reply) >>>> Ok checked this morning in the daylight and the resivour was empty. >>>> Filled it up and looked into the radiator and it also looks empty, at [quoted text clipped - 57 lines] > If the rear heater is electric, check for power going into the heater > element. That will be checked when I get it into service too. Thanks for all your help. -- Rob "A disturbing new study finds that studies are disturbing" >>>>> Ok checked this morning in the daylight and the resivour was empty. >>>>> Filled it up and looked into the radiator and it also looks empty, at [quoted text clipped - 69 lines] > Rob > "A disturbing new study finds that studies are disturbing" You're welcome, let us know what the service department finds out. SignatureRay O (correct punctuation to reply) >>>>>> Ok checked this morning in the daylight and the resivour was empty. >>>>>> Filled it up and looked into the radiator and it also looks empty, at [quoted text clipped - 73 lines] >> > You're welcome, let us know what the service department finds out. I certainly will. -- Rob "A disturbing new study finds that studies are disturbing" >> Ok checked this morning in the daylight and the resivour was empty. >> Filled it up and looked into the radiator and it also looks empty, at [quoted text clipped - 24 lines] > the engine. Luckily, since I watch the temp guage all the time, I stopped > the engine when it look abnormal and saved myself a lot of grief! Seems I may have a leak right around the lower radiator hose. Can't tell for sure but I see some runs of fluid there on the under carriage guard. Regardless at 7K I shouldn't have to deal with such things. Filled it up and will get it into the service center ASAP. -- Rob "At the moment a very unhappy first time Toyota owner!!!!" <snipped> > Seems I may have a leak right around the lower radiator hose. Can't tell > for sure but I see some runs of fluid there on the under carriage guard. [quoted text clipped - 6 lines] > Rob > "At the moment a very unhappy first time Toyota owner!!!!" Leaks are rare at 7,000 miles. When the service department fixes the leak, hopefully they will flush out the Peak stuff you mixed in and re-fill with Genuine Toyota coolant. SignatureRay O (correct punctuation to reply) > <snipped> >> [quoted text clipped - 12 lines] > leak, hopefully they will flush out the Peak stuff you mixed in and > re-fill with Genuine Toyota coolant. I'll have then flush the system regardless. That was all I could get my hands on, on a Saturday morning. Drove the truck a few times today and noticed no wet spots under it in the places I parked and oddly enough when I was under it today I didn't see any of the tell tail signs of fluid leaks. I took about a half bottle of anti freeze to fill and I put about a quart in the reservoir. I'll make arrangements to get it to the service department tomorrow. -- Rob "A disturbing new study finds that studies are disturbing" |
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