Question about 1998 Toyota Sienna

11 Answers

Not enough cabin heat in my Chevy Venture 97

I had had multiple services done but to no avail. The following symptoms exist :
- The temperature guage stays towards cold all the time, except when engine is idling for a long time.
- The cabin heat is lukewarm
- Windows get fogged up as soon as I turn the inside air circulation on. Fogging is gone when I put the defroster with a/c on.
- Engine has noticeable vibration when idling.

Recently changed thermostat, flushed cooling system and also had pressure testing done. No noticable coolant smell anywhere. Coolant is topped off as well. Mechanic recommending a heater core replacement.. and I want to know if that's the best solution to fix the heating and fogging problem.

Posted by on

  • 5 more comments 
  • ashu9211 Jan 12, 2009

    Yes, the thermostat was professionally installed. I am wondering if I need to change the heater core now and if not, what else may be the problem based on the symptoms.

  • ashu9211 Jan 12, 2009

    Any idea why the temperature guage is affected ? Heater core is probably not responsible for that, and I changed the thermostat as well. As stated in my question, the temperature gauge comes up to middle when idling for long time, but drops to cold as soon as I start driving.

  • ashu9211 Jan 12, 2009

    Does heater core solve the temperature guage problem as well?

  • ashu9211 Jan 12, 2009

    cabin filters have already been changed.

  • ashu9211 Jan 12, 2009

    no response yet about the temperature guage fluctuation..

  • ashu9211 Jan 12, 2009

    looks like no one is reading my comments.. ! Please read latest comments to advise further.

  • ashu9211 Jan 12, 2009

    I will give your recommendation a shot as most other experts agree to as well. Thanks.

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11 Answers

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HI
i assume front fog lamps ? the head lights have to be on dipped beam then the fogs will also work but in uk this is so as to prevent fogs only being used (blinding oncoming traffic ) if weather conditions req fogs to be used for poor visibility ? then the side/tail and h/lights must also be on like wise the rear fog light/s operate the same way hope this helps and makes perfect sense ?? all above is assuming bulbs have been checked and fuse/relay and power to each lamp ?

Posted on Jan 12, 2009

  • ABHISHEK.C
    ABHISHEK.C Jan 12, 2009

    Try changing the plugs (be sure to set proper gap) and air filter. I don't
    know if your car has a distributor or not, but if it does get a new cap and
    rotor.

    If it was a carbureted car I'd guess the choke needs adjusting, but these
    modern things are supposed to continually adjust everything for you to keep
    the car running optimally... Unfortunately it doesn't always work that way,
    and when it doesn't, it's only harder to figure out what's wrong.



    Put in new plugs and used a bottle of Techron injector cleaner.





  • ABHISHEK.C
    ABHISHEK.C Jan 12, 2009

    That vehicle has 2 "Cabin Filters" (ALL of the air that is dispensed into cockpit goes through the cabin filters first-clogged means no air flow!!). They are located in the back of the glove compartment.
    1. Empty glove box.
    2. Locate access panel in back of box.
    3. open panel.
    4. Remove the 2 "FILLED WITH GARBAGE" filters.
    5. Price shop these beacuse we sell top of the line "Charcoal" filters & install them for $19.99 + tax. That's product & install for that price!!
    6. Replace them every 15-20K!
    7. Reach inside the bottom of filter area & you will feel the blower. remove all the debris from there & problem solved!
    PS-for the other running rough issue, I'll bet it's 2 things:
    1. Engine air filter is wasted.
    2. You need to have a "3 part fuel injector" cleaning. It restores performance, horsepower & fuel mileage. $59.99-$89.99.
    PS-Like the email I sent you said, make sure to check the coolant/anti-freeze, when low you can have low heat output & you may have a thermostat issue. This vehicle has "Dex-cool" coolant in it from factory, that has MANY issues as well.



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The heater core works in conjunction with your engine's cooling system. The function of the cooling system is to remove heat from the engine, and it does this for the most part by sending the heated anti-freeze to the radiator located in the front of the car. The position of the radiator allows outside air to blow across the radiator thus cooling the anti-freeze.
The anti-freeze is then sent back to the engine. Hot anti-freeze is circulated throughout the cooling system by the radiator and heater hoses. Think of the heater core as a small radiator located inside the dashboard of your vehicle. Click for picture. Anti-freeze is constantly being circulated throughout the engine, radiator, and yes even the heater core regardless of whether you have the heater dashboard switch on.

When the heater is turned on by the driver, a diverter door opens to the heater core area in the dashboard. A small fan (commonly referred to as the a/c fan or blower) blows air across the hot heater core into the duct work of the dashboard and into the interior of your car.
When the heater core leaks (it leaks anti-freeze of course) it will usually leak inside the car on the passenger floorboard under the carpet. If your heater isn't working properly, or if you smell a sweet odor, investigate the passenger-side
floorboard for signs of anti-freeze leakage. A leaking heater core may also cause a greasy film on the inside of the windows.

So what causes the heater core to leak in the first place? Usually the main culprit is rust build up caused from lack of cooling system flushes. Anti-freeze acts as a lubricant and rust inhibitor as well as a temperature controlling substance. Anti-freeze should be flushed and replaced periodically to keep the cooling system in good working order.
With the engine at normal operating temperature, the upper radiator hose should be very hot, and the lower radiator hose should be just slightly less hot. If there is a substantial temperature variation, a blockage or restriction is probably present. A faulty thermostat and a radiator or heater core that is full of calcium deposits or rust build up are a few causes of cooling system restrictions.

Posted on Jan 12, 2009

  • blueextc3221
    blueextc3221 Jan 12, 2009

    your mechanic is correct. Replacing the heater core is advised.

  • blueextc3221
    blueextc3221 Jan 12, 2009

    The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

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I had the same thing...especially the fogging problem. I replaced my heater core and everything went back to normal. So, as others have told you, yes, the heater core.

Posted on Jan 12, 2009

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The fogging problem indicates that the heater core is bad and not allowing circulation of the coolant.

Posted on Jan 12, 2009

  • Paul Broadhurst Jan 12, 2009

    The fogging condition indicates the heater core is bad and needs to be replaced.

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U have tried everyting now u shoud replace the heater core

Posted on Jan 12, 2009

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I HAVE THE NO DOUBT ANSWER & it can be fixed in 5 minutes.
That vehicle has 2 "Cabin Filters" (ALL of the air that is dispensed into cockpit goes through the cabin filters first-clogged means no air flow!!). They are located in the back of the glove compartment.
1. Empty glove box.
2. Locate access panel in back of box.
3. open panel.
4. Remove the 2 "FILLED WITH GARBAGE" filters.
5. Price shop these beacuse we sell top of the line "Charcoal" filters & install them for $19.99 + tax. That's product & install for that price!!
6. Replace them every 15-20K!
7. Reach inside the bottom of filter area & you will feel the blower. remove all the debris from there & problem solved!
PS-for the other running rough issue, I'll bet it's 2 things:
1. Engine air filter is wasted.
2. You need to have a "3 part fuel injector" cleaning. It restores performance, horsepower & fuel mileage. $59.99-$89.99.
PS-Like the email I sent you said, make sure to check the coolant/anti-freeze, when low you can have low heat output & you may have a thermostat issue. This vehicle has "Dex-cool" coolant in it from factory, that has MANY issues as well...

Thanks.

Posted on Jan 12, 2009

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Once the engine has warmed if you hold the hoses of the heater core and they are just lukewarm possibly "cold"" .. you need to replace the heater core ..

Posted on Jan 12, 2009

  • 3 more comments 
  • Jay Glendenning
    Jay Glendenning Jan 12, 2009

    The heat rise could be based on how fast the water pump and engine cooling fan are running.



    Have you checked the water pump speaking of water pumps?

  • Jay Glendenning
    Jay Glendenning Jan 12, 2009

    After you mechanic replaced the thermostat .. did he bleed the air out of the system?



    If not .. this is what needs to be done ..





    Set heater for maximum heat. Remove radiator cap. Loosen drain plug and remove drain bolt (if equipped) from engine block. Drain coolant reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant mixture. Loosen bleed bolt and fill radiator up to base of filler neck. Close bleed bolt when coolant flows out without bubbles. Tighten bleed bolt. With radiator cap removed, start and operate engine to normal operating temperature. Add coolant if necessary and check for leaks.

  • Jay Glendenning
    Jay Glendenning Jan 12, 2009

    If the temperature guage is faulty the heater core replacement doesn't fix that.



  • Jay Glendenning
    Jay Glendenning Jan 12, 2009

    After you replace the heater core .. Make absolutely sure that the system gets "air bled" ..



    Air in the colling system can create "air locks" and that will affect heating and cooling characteristics of your system

  • Jay Glendenning
    Jay Glendenning Jan 12, 2009

    Are you reading all of our posts also?



    There are many "bits" of info here .. Have all been done?



    What was the result?

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Welcome to Fixya! The Heater Core is the Problem. Replace that and your Problems are Solved.

Posted on Jan 12, 2009

  • Travis Humphries
    Travis Humphries Jan 12, 2009

    Yes it will.

  • Travis Humphries
    Travis Humphries Jan 12, 2009

    The Heater Core will fix the Guage too. It is sending bad signals to the Guage right now.

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Hi welcome to fixya i would highly recommend you do the replacement because if you wait it can get worst and cause more problem that you dont want so yes get the heater core replacement

Posted on Jan 12, 2009

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Yes as per the things you checked i feel its necessary to replace the heater core.

Posted on Jan 12, 2009

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When you changed the thermostat did you put the proper end toward the motor and feel the heater hoses... are they both hot ?

Posted on Jan 12, 2009

  • 3 more comments 
  • Roberta Smith
    Roberta Smith Jan 12, 2009

    if both inlet and outlet are not hot it is indeed the heater core... i would try reverse flushing it first... if that doesn't work it does need to be replaced



    Robert

  • Roberta Smith
    Roberta Smith Jan 12, 2009

    please read and rate my secondary solution... thanks

  • Roberta Smith
    Roberta Smith Jan 12, 2009

    a good chance then that the thermostat was not installed correctly



    Robert

  • Roberta Smith
    Roberta Smith Jan 12, 2009

    My reasoning behind that is the purpose of the thermostat. it's function is to keep the engine at a certain temperature by opening or closing. if it is stuck open the radiator is allowed to cool the motor too much.



    Robert

  • Roberta Smith
    Roberta Smith Jan 12, 2009

    I have added additional comments

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