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Thread: Thermostat valve of Honda iDSi

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    Default Thermostat valve of Honda iDSi

    I have few questions regarding thermostat valve, as I have identified mine as stuck open

    1. What is the actual life of thermostat valve like these items will eventually fail so when is the best time to replace them as preventive maintenance work as we know if fail can severely heat the engine and can further damage it.

    2. Should we install the one available from scrapyard market such as Sultan Kah Khoo if your original failed for some reason.

    3. Can we trust the local shops who sells thermostat valve either as brand new or second hand, as I am sure that they must be Chines.

    4. Mine one bought from Honda motors failed within a year, this means that they are not selling the genuine equipment even though I paid them Rs. 1200.

    5. Best source to buy from.

    6. Will the thermostat valve of Toyata will fit into Honda or for matter of fact the new model Honda will fit into old model Honda or vice versa.


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    If it fits correctly (same size) and has the same temperature rating it will work

    Btw, what is the temperature rating of the thermostat you've installed?
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    Quote Originally Posted by syncview View Post
    If it fits correctly (same size) and has the same temperature rating it will work

    Btw, what is the temperature rating of the thermostat you've installed?

    i don't remember, bought it from Honda Motors, no clue so what ideally should be the rating of thermostat valve for 1300c.c car.

    rest self edit, as i have modified the main body of thread.

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    The common rating here is 82c

    If you have a 82c valve then you have a problem as per the current temperature readings

    If you have a lower temp thermostat it may still be good
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    Quote Originally Posted by talhawaleed View Post
    I have few questions regarding thermostat valve, as I have identified mine as stuck open

    1. What is the actual life of thermostat valve like these items will eventually fail so when is the best time to replace them as preventive maintenance work as we know if fail can severely heat the engine and can further damage it.

    It is ver difficult to predict the life of the thermostatic valve. A lot of it depends on the cooling circuit itself. I mean the cleanliness and coolant quality in which a thermostatic valve is sitting. Coolant also acts as a corrosion inhibitor, therefore a coolant not changed for a long time may affect the life of the thermostatic valve.

    2. Should we install the one available from scrapyard market such as Sultan Kah Khoo if your original failed for some reason.

    Never use a second hand thermostatic valve as replacement part.

    3. Can we trust the local shops who sells thermostat valve either as brand new or second hand, as I am sure that they must be Chines.

    Verification of OEM part can be done after consulting with the vehicle manufacturer from whom it is bought. Normally, it is ver rear to find non-genuine parts from a dealer.

    4. Mine one bought from Honda motors failed within a year, this means that they are not selling the genuine equipment even though I paid them Rs. 1200.

    Failing of thermostatic valve within one year of replacement is hard to believe. Perhaps your cooling system cleanliness and coolant quality needs to be checked. Also, a cat which is not operated for long May face similar problems. Daily operation of car prevents the system from corrosion than one where coolant is stagnant.
    5. Best source to buy from.

    From the dealer. Verify with them the part to be genuine. They will inform you how to check the packing with hologram etc, and how to differentiate between genuine and non- genuine part.
    6. Will the thermostat valve of Toyata will fit into Honda or for matter of fact the new model Honda will fit into old model Honda or vice versa.
    It could fit or may be not but don't try it as the thermostatic valve opens / starts opening at different temperatures (82 to 85) as per design of the cooling system of any particular car.
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    Today went to Honda genuine part sellers and bought a new thermostat valve built for Honda with its tag for around Rs. 700, I remember the same one I bought for around 1200 the previous year from Honda Motors. One further inquiry he said that this is made in Thailand, everyone uses the same and this is the only one available in the entire market.

    Temperature ratings was 78C although I insisted that I needed the one with 82C but the guy said that on Honda it comes with 78C and no one has 82 for the model. I don’t know how true his claim was.

    After installation and drive to my home and around town for half an hour, temperature remained at constant 78C and rose to maximum 84C then quickly came back to 78 again.

    Rubber seal inside the old one apparently looked damaged but question is how good 78C coolant temperature for most of the driving time.

    What does this tells me. Am I good or normal operating temperature should be higher, rest of the cooling system has been very well maintained?

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    During some maintenance my mechanic told me that thermostat valve is not installed in my car might be it will be removed by previous owner. my question is whats the exact function of this valve and without it using the car is harmful for engine or not ?

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    Quote Originally Posted by lahori View Post
    During some maintenance my mechanic told me that thermostat valve is not installed in my car might be it will be removed by previous owner. my question is whats the exact function of this valve and without it using the car is harmful for engine or not ?
    engine will take too long to get to operating temp

    that will ruin fuel economy
    reduce engine oil life
    reduce engine life
    haters gonna hate, potatoes gonna potate

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    What is the definition of cold coolant temperature, if your coolant temperature quickly rises to 78C and remains their and occasionally drops to 75C then is it ok for the vehicle. I have noticed, that it occasionally rises to 84C once car is idling on stop light and quickly drops back to 78C.

    Is this temperature ok for engine oil, fuel efficiency etc.

    I request @Xulfiqar to provide some insight into this.

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    Yes this is OK
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    sounds about ok, the 78C thermostats were OE items in the B, D, F and H series engines. some L series even had them. cold engine usually means less than 50C
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    Quote Originally Posted by Xulfiqar View Post
    sounds about ok, the 78C thermostats were OE items in the B, D, F and H series engines. some L series even had them. cold engine usually means less than 50C
    sir why suzukis use 88 deg thermo valve?
    Just Do It Your Self!!!!!

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    They are hot
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