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Old 29th January 2008, 18:39   #1
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Question Esteem - engine overheating - TECH2 gives normal reading

Last saturday evening while at a traffic signal I noticed the engine temperature gauge to be above the half mark.switched off the ac & still it didnt come down.it was continuously above the half mark & it climbed to the 3/4th mark.then the radiator fan would switch on & the guage comes below half.

monday morning took it to a mass near my house.they replaced the coolant.charged me 250 bucks.On the way from mass to office the needle was again touching 3/4th mark.

this mass guy was suggesting removal of the valve which activates & stops the flow of coolant, saying its required in cold weather only

today took it to RNS.they connected TECH2 & said that the raidator fan was switching on at 98 degrees which they said is the correct temp.they said that it could be a problem with the guage on the dash & they will have to check the same.i asked them to replace the sensor to check if it was faulty, thy did not have stock.they say that unless the temp needle touched the "H"(max) mark, there is no problem,

Im in a fix,
should i continue driving the car?.will it damage the engine?
if the sensor is faulty, won't it give wrong values to the ecm/scanning tool(tech2 in this case)?

Plan to take it to bimal tommorow, have to sit on their head to sort this out.
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Old 29th January 2008, 23:19   #2
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check sensor, i had a similar issue with iKON which was solved with replacing sensor.
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Old 29th January 2008, 23:33   #3
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Check for any coolant leaks. I had the same problem with my esteem and it turned out to be a very minor coolant leak. Behind the engine near the gearbox is a seal which when broken start leaking coolant.

Check to see if the coolant is leaking from there and also check the coolant level in the reservoir to see if it is reducing.

If there is no coolant leak then it must be the sensor.
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Old 30th January 2008, 13:32   #4
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Quote:

this mass guy was suggesting removal of the valve which activates & stops the flow of coolant, saying its required in cold weather only
Please dont! That is required for the car to maintain its optimum running temperature. I agree with Jaggu, check your sensor.
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Old 30th January 2008, 14:57   #5
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I will also suggest to chk sensor,, i had same issue in my old M800, Once since i was traveling to Baroda, Temp Shooted up, stop the car, fortunately Road-side garage was near by, Mechanic chked the car and told that Sensor was gone .. for temp purpose he did direct connection ,, i manage to travel 450km on that , but after returning home we did change sensor..

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Old 30th January 2008, 15:13   #6
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I would also suggest you to check if the radiator is clogged, the sensor needs to be checked too.

This happened to me in my Santro once and I was stranded on a bridge and the culprit turned out to be a clogged radiator, which was later flushed and cleaned.
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Old 30th January 2008, 15:42   #7
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Quote:
Originally Posted by ad75 View Post
this mass guy was suggesting removal of the valve which activates & stops the flow of coolant, saying its required in cold weather only
Its called the Thermostat. And whatever you do DON’T TAKE IT OUT.
It aids in fast-warming of the engine, without the thermostat the engine takes at least 30 minutes to reach operating temperature and that means on an average office run you might not even reach normal operating temperature.

Very often it could be a faulty thermostat and replacing it should fix your problem. Check the specifications to see the thermostat opening temperature (I think its 91ºC but that could be the Australian spec). Boil some water with the thermostat and a thermometer in it and see when the thermostat opens, if it doesn’t open when its meant to, treat yourself to a new one.
Also
- Check if your loosing water/coolant, it could be heating because the level is low
- Flush the cooling system from the heater core.
- If you can get the radiator reconditioned, and get it tested for flow. It could be a faulty water pump for improper circulation.
- Maybe you need to take your car to a radiator/cooling-system specialist.
Note; The amount of coolant in the system doesn’t aid in cooling. In fact water cools better than coolant.
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Old 30th January 2008, 18:54   #8
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hi,

had written to maruti regarding this issue,the maruti guy asked me to take the car again to RNS.

i took the car today, they did a radiator flush & asked me to check it for few days.they say that the sensor, thermostat & the coolant circulation are fine.

they connected the tech2 again the radiator fan is switching on at 98 deg.& switching off at 91deg.the guage was at half mark today at RNS.

the coolant level has not gone down.its the same.

does anyone know the temperature at which an esteem mpfi radiator fan should swich on?

they say that in esteem and baleno the temp needle on the dash goes upto 3/4th mark & its normal.i had never seen this in my car for the last 8k kms.

can anyone confirm this?
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Old 30th January 2008, 19:10   #9
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3/4 is not normal in an esteem. My car never used to go up above half. It always use to stay a little below half.
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Old 30th January 2008, 20:22   #10
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half mark is fine, but not above half, some variation will happen from meter to meter. best is to refer to your old readings than to compare with others.

fan kicking in at 98 seems to be fine, though i dont remember the exact temp at which it does.

Keep an eye on coolant level for next few weeks and also if the temp needle. If not check the meter console and wiring.
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Old 30th January 2008, 21:24   #11
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Quote:
Originally Posted by ad75 View Post

does anyone know the temperature at which an esteem mpfi radiator fan should swich on?

they say that in esteem and baleno the temp needle on the dash goes upto 3/4th mark & its normal.i had never seen this in my car for the last 8k kms.

can anyone confirm this?

mine is a carb & the gauge is always at a constant 60%. Reaches there pretty quick & stays right there. Check your coolant level twice a day to rule out any leaks.
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Old 30th January 2008, 22:25   #12
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The maximum my needle has touched so far is just a little below the half mark. Never have I seen it climb beyond that anyday. I am not sure if its normal to see the needle go till the 3/4th mark. Sounds a bit strange to me. Mine is an MPFI Esteem, by the way.
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Old 30th January 2008, 23:13   #13
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What makes them say that the Thermostat is fine? All the symptoms look like a thermostat issue. The Radiator Fan switching on/off at certain temperaturs only means that the sensor used to trigger that is working fine. So if the same sensor feeds to your temp gauge, the gauge too is fine.

I strongly beleive its the thermostat, which shouldn't be a costly device to change.
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Old 31st January 2008, 09:41   #14
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Change the sensor first, irrespective of what they are saying. It isnt very costly. Use a MGP only for replacement.

Run it for a few days and see if that helped.

If not then change the thermostat valve. Based on whether these helped resolving the problem or not, further diagnostic can be done.
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Old 1st February 2008, 13:42   #15
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Default Over Heating Issue

THE CORRECT TEMP FOR THE RADIATOR FAN TO CUT IN IS 98 DEG. AND CUT OFF IS 92 DEG. IF U NOTICE THERE ARE THREE WIRES IN THE CONNECTOR OF THE SENSOR ,TWO WIRES SEND THE VOLTAGE READING TO THE E.C.U TO TRIGGER THE RAD. FAN ,THE THIRD WIRE IS CONNECTED TO THE TEMP. GAUGE . SOME TIMES IT HAS BEEN OBSERVED THAT THE PART OF THE SENSOR (WHICH IS AT THE TIP OF THE SENSOR)WHERE THE TEMP GAUGE IS CONNECTED FAILS,LEADING TO THE GAUGE OVERREADING,REPLACING IT WITH A (MGP) SENSOR WHICH SHOULD COST AROUND RS.650/=. HOWEVER IT SEEMS THAT THE TECH2 READING IS BEING TAKEN WHILE THE VEHICLE IS IN STATIONARY POSITION, TAKE THE READING WHILE THE CAR IS BEING DRIVEN AND THE AIRCON IS ON,THIS WILL INDICATE IF THERE IS CLOGING IN THE COOLING SYSTEM INCUDING THE RADIATOR. UNDER NO CIRCUMSTANCE THE READING SHOULD BE ORE THAN 98 DEG. EVEN 99 DEG IS UNACCEPTABLE. FINISH THIS EXERCISE AND REVERT BACK, I WILL BE IN A BETTER POSITION TO ADVISE. MY NICK NAME IS POMPY AND MY CELL NOS. ARE (09835020200/09334116002) I WILL BE TOO GLAD TO HELP WHENEVER NEEDED.
Quote:
Originally Posted by ad75 View Post
Last saturday evening while at a traffic signal I noticed the engine temperature gauge to be above the half mark.switched off the ac & still it didnt come down.it was continuously above the half mark & it climbed to the 3/4th mark.then the radiator fan would switch on & the guage comes below half.

monday morning took it to a mass near my house.they replaced the coolant.charged me 250 bucks.On the way from mass to office the needle was again touching 3/4th mark.

this mass guy was suggesting removal of the valve which activates & stops the flow of coolant, saying its required in cold weather only

today took it to RNS.they connected TECH2 & said that the raidator fan was switching on at 98 degrees which they said is the correct temp.they said that it could be a problem with the guage on the dash & they will have to check the same.i asked them to replace the sensor to check if it was faulty, thy did not have stock.they say that unless the temp needle touched the "H"(max) mark, there is no problem,

Im in a fix,
should i continue driving the car?.will it damage the engine?
if the sensor is faulty, won't it give wrong values to the ecm/scanning tool(tech2 in this case)?

Plan to take it to bimal tommorow, have to sit on their head to sort this out.
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