Car Temperature Indicator.

Discussion in 'General Electronics Chat' started by Lanz, Aug 28, 2009.

  1. Lanz

    Thread Starter Active Member

    Oct 30, 2008
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    Hi guys,need some help here.
    Today,I back to hometown after a long time from study place.
    As soon i reach my house,i get my car key and start it.
    Then i drove a bit faster to reach nearby bank b4 its closed,but b4 i reach the bank,i heard some weird noise coming from the front of the car,so i just wondering whats the sound abt and when i turn my head towards the temperature meter,OMG the temperature was too high(half of the range).I stopped my car aside and think.Then i drive slowly back to my house.After the engine was cooled down,i open the radiator cap and checked for the water level,there is still some water there,can say 3/4 of ussual level.I think my dad forgot to fill up some water to the radiator.So im thinking of adding a circuit that can remind me when the temperature reach certain range and also with 7 segment temperature display in celcious..Maybe a signal from the thermostat can be used for this purpose.Any idea?
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    Lanz,

    What kind of car are you driving that doesn't have a temp gauge or at least "idiot lights"?

    Ken
     
  3. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,696
    904
    Most likely, it is from the water pump, which is failing. Check for wobble of its drive pulley and for coolant leakage from the bearing (there is often a small 3mm or so hole cross drilled in the support casting).

    It appears you already have a temperature gauge. Why do you need another one?

    Finally, when you refill, it is best to use a mixture of antifreeze and water rather than water alone, even though you may not get freezing temperatures where you live. Replacement of a water pump is relatively easy to do. Be careful, however, in some cars the attachment bolts are doing duty, and you must take some precautions when removing them. Any model-specific manual will tell you whether that situation applies to your car and which bolts are affected by it.

    John
     
  4. Lanz

    Thread Starter Active Member

    Oct 30, 2008
    153
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    Ken i drive Toyota Corolla GL.It do have temperature gauge.All i need is a warning light or buzzer to warn me when the temperature raise high.It will be better if i got digital temperature display.

    How it looks like and where its located?

    Yes,i do have.I just need a digital one that can display the temperature so that i can set the warning temperature value.
     
  5. Tronster

    Member

    Dec 29, 2008
    17
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    I second the water pump idea ....
    You do not need an additional temperature warning ... you probably need a new water pump.
    Get a flashlight ... torch ... some adequate illumination and inspect the area around where the drive belts are on the engine. If you look carefully, you should find a small diameter 'weep hole', which will show evidence of mineral evaporation due to the engine coolant leakage .....
    If convenient, post a picture of your engine block .... the water pump if you can find it.

    Do not hesitate to replace the WP.
     
  6. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,696
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    It is located on the engine, usually near the fan belt (if present) accessory belt or serpentine belt. It is driven by one of those belts. What model year do you have?

    [​IMG]

    The small hole in the housing is barely visible in the insert photo. Many newer models don't use gaskets, but you must use a proper sealant.

    John
     
  7. Lanz

    Thread Starter Active Member

    Oct 30, 2008
    153
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    Its from year 1982
     
  8. Lanz

    Thread Starter Active Member

    Oct 30, 2008
    153
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    I checked my car.There is no water leaking.But the reservoir tank has been full.Usually before a long drive,i will check the water level inside the radiator and fill some if not enough.After the long drive,i saw the reservoir tank is full and the water level inside the radiator is low again.I dont know why.
     
  9. Tronster

    Member

    Dec 29, 2008
    17
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    ... Given the additional information .... the water pump may not be the source of the low water level in the radiator ...

    Is there a radiator cap that is specific to the radiator? This cap would be separate from the coolant overflow bottle, and located actually on the radiator itself.
    A common problem is that the radiator cap loses its pressure seal. This might be due to the gasket becoming brittle ... aging ... or possibly a weak spring. This may be what is happening, in such a manner that it would cause the coolant to appear to be low when you check it ... inside the radiator, but not within the coolant bottle.
    If you have a well equipped auto repair shop nearby, they should actually be able to check your radiator cap, and determine it is sealing properly. There is a test device that will test the cap to a specified pressure .... for your vehicle.
    However, it may be convenient to just purchase a new radiator cap and then take the car for a test drive.
     
  10. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Since your radiator is losing coolant but your overflow reservoir is staying full, you must have a leak in your cooling system somewhere. It could be anywhere that coolant flows through; radiator, radiator hoses, water pump, heater hoses, the heater core, head gasket, engine block, freeze plugs, etc.

    If you have not maintained your antifreeze level and changed it at the recommended intervals, a corroded head gasket or corroded freeze plugs are likely.

    Check your oil dipstick. If you have a leaking head gasket, coolant can leak into the engine oil and it will look milky. This is obviously very bad for your engine.

    Take your car to a radiator shop and have them pressure test your cooling system. They can usually pinpoint where any leaks external to the engine block itself are pretty quickly.
     
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