Engine Temperature Going Up on Uphill

[widewings]

Tanong ko lang po ano kaya ang problema ng Mirage Dingo 2000 ko pag tumakbo na ng uphill yung engine temperature tumataas? Na flush na po ang radiator ok naman. Bago na ang thermostat at pump. No leak at hindi bumababa ang radiator fluid at wala ring bubbles. Possible kaya na ang cause is yung transmission fluid kasi nakita ko nakakabit din pala sya sa radiator?Salamat po.

[ghosthunter]

Have you replaced the radiator cap? Old radiator cap can leak through deformed or cracked rubber seals.

[coiter]

Tanong ko lang po ano kaya ang problema ng Mirage Dingo 2000 ko pag tumakbo na ng uphill yung engine temperature tumataas? Na flush na po ang radiator ok naman. Bago na ang thermostat at pump. No leak at hindi bumababa ang radiator fluid at wala ring bubbles. Possible kaya na ang cause is yung transmission fluid kasi nakita ko nakakabit din pala sya sa radiator?Salamat po.

gaano kataas yung temp? gaano kataas at haba ng incline? dati ba hindi ganyan?

alam ko normal naman na tataas ang temp kung mahaba at steep ang incline kasi hindi masyado nakakakuha ng hangin ang radiator and at the same time mas pwersado ang makina. try also checking yung cooling fan. baka slipping na (in case of a clutch fan) or pabigay na. kung ok pa, try adding an aux fan.

[miked]

Check also hose integrity... the 2 hoses may be failing especially lower hose. upper hose is under pressure and hotter while lower hose is cooler and for suction of water from rad to engine. since uphill climb therefore high rpm ang engine and so is the water pump thus creating vacuum at water jackets.

plus the fact that your transmission is internally cooled by the engine rad, i think it's normal for the temp to go up since the A/T is working harder on uphill as compared on level roads

[widewings]

One time 15minutes yung uphill na inakyat pumalo ng mga 100 degrees Celsius yung temp. Tapos nung pa downhill na baba agad yung temp sa normal temperature.

Mukang ok naman yung radiator cap kasi hindi naman nababawasan o nadadagdagan yung radiator fluid.

Engine, radiator, fan, fan controller, hose, thermostat, pump lahat yun na check last year kasi may time na biglang pumapalo yung temp gauge sa overheat. Laki nga ng nagastos namin tapos after mapalitan at macheck ang lahat gauge lang pala ang problema.

Kaya ang suspect ko ngayon is transmission. Yung level ng transmission fluid ay nasa minimum ng hot. Sa tingin ko nabawasan yung atf last time na binaklas yung radiator para i-flush at i-pressure test.

[phezthie]

Check also hose integrity... the 2 hoses may be failing especially lower hose. upper hose is under pressure and hotter while lower hose is cooler and for suction of water from rad to engine. since uphill climb therefore high rpm ang engine and so is the water pump thus creating vacuum at water jackets.

plus the fact that your transmission is internally cooled by the engine rad, i think it's normal for the temp to go up since the A/T is working harder on uphill as compared on level roads

+1 to this advise, besides its not too costly if you would try...

[widewings]

Check also hose integrity... the 2 hoses may be failing especially lower hose. upper hose is under pressure and hotter while lower hose is cooler and for suction of water from rad to engine. since uphill climb therefore high rpm ang engine and so is the water pump thus creating vacuum at water jackets.

May I know how can I check if those 2 hoses are still alright? I dismantled those hoses and they seem alright. No sign of deterioration nor blockage.

I traveled almost 200km mostly flat road on a hot day with air-con on non stop. The engine temperature didn't even went up.

Temperature really just goes up going uphill on a speed less than 60kph.

[edtf]

check the clutch fan (kung meron nga) too - baka masyado na malambot or it is slipping that is why cooling is not that efficient during high RPM

[widewings]

check the clutch fan (kung meron nga) too - baka masyado na malambot or it is slipping that is why cooling is not that efficient during high RPM

Is the clutch fan the same as the radiator fan? If it is, it is engaging at the right temp 90 degrees celcius. Also, when the aircon was on the radiator fan is working alright. BTW, this model of vehicle only has one fan for the radiator and A/C.

Thanks for all your suggestions.

[miked]

Clutch fan is usually a thermostatic type of fan with a coiled bimetallic strip which detects air temp, controls the rpm of fan and which is also crankshaft driven via a V-belt. clutch fan engages at low speeds (low airflow at traffic) and disengages at high speeds (highway runs). it has an impeller and a rotor/turbine inside the assembly. similar to the operation of an automatic transmission. it can be refilled with silicone oil or a high grade gear oil on Mcguyver situations.

Auxillary fans are usually installed at the front facing (or before) the radiator if you are facing the engine. they are usually controlled via thermo switches.

[userfriendly]

I think its your ATF that heats up. One of my cars have exactly the same symptoms. Temp goes up when going up hill and cools down when going down hill.

My mechanic a former casa supervisor diagnosed it as the ATF heating up just check your ATF regularly and make sure it does not smell burnt.

[phezthie]

May I know how can I check if those 2 hoses are still alright? I dismantled those hoses and they seem alright. No sign of deterioration nor blockage.

I traveled almost 200km mostly flat road on a hot day with air-con on non stop. The engine temperature didn't even went up.

Temperature really just goes up going uphill on a speed less than 60kph.

our eyes sometimes deceive us, try to press your lower hose specially that part close to the lower rad tank. if you feel its light or softer, replace it. during high rev, its probably collapsing causing insufficient water to run thru it going to the engine block, thus, causing "high rev overheat".

thats wat happened to my accord, i thought it was an eb/hg issue. i bought so many testers and tools abroad only to find out that its a simple hose issue which can be remedied even my a mere replacement one...

again, thanks boss miked for giving me that idea... I now enjoy using my accord just like before, be it in traffic, uphill or high rev condition..

[miked]

May I know how can I check if those 2 hoses are still alright? I dismantled those hoses and they seem alright. No sign of deterioration nor blockage.

I traveled almost 200km mostly flat road on a hot day with air-con on non stop. The engine temperature didn't even went up.

Temperature really just goes up going uphill on a speed less than 60kph.

upper hose can be hard as a rock...lower hose can be softer than your kitchen sponge....replace if these are the state of your hoses.

[widewings]

Thanks a lot for all your suggestions.

Now, temperature just goes up to 90 degrees Celsius. Just added half a liter of ATF to make it between min and max. I think it could be either that the ATF fluid is to low or it is old enough that it losses its lubricating properties.

So before next summer I'll have the ATF change.

Again thanks a lot.