Overheating in Long driving..

[speedyfix]

if you overheat when at high speed it's either a busted headgasket or a radiator that isn't working properly na due to bara. malamang it's clogged in some of the fins. enough to cool the engine properly in traffic but kulang na pag mabilis.

[laBorer]

please pardon my reincarnating this thread. sir kokoy_a, na-solve na ba problema mo? what finally was the culprit? paano ginawa mo? while in nlex yesterday, i experienced the same symptoms - at 120kph temp needle goes up to 3/4 and a/c does not function. if i limit at 2500 rpm max, no problem, temp stays at 1/2. upon entering manila, back to normal...

[mbeige]

Check your thermostat.

[laBorer]

matic ba ride mo? please clarify this one....sliding na matic mo cause of overheat yan.. experience ko sa liteace&delica....

baka needs general overhaul ng radiator, then flushing of the cooling system...

yup it's a/t. but i dont think sliding na dahil at 120 kph, rpm is at 3000 - which i think is just about normal. and i had the radiator overhauled just 2 months ago.

pinalitan ko yung radiator cap this weekend, busted na. normal ang temp nya in short drives in manila, ma-check ko in long drives this midweek when i go to bataan..

Check your thermostat.

thermostat is ok.

thanks, alwayz_y and mbeige...

[alwayz_yummy]

matic ba ride mo? please clarify this one....sliding na matic mo cause of overheat yan.. experience ko sa liteace&delica....

baka needs general overhaul ng radiator, then flushing of the cooling system...

[speedyfix]

replace the radiator or check for signs of a busted head gasket.

[jing]

how would you know if you have a busted cylinder head?

[rusem]

i've personally experienced this. the culprit was a dirty radiator... when your driving at higher speeds (120kph up), the flow or circulation of water also speeds up (water pump spinning faster. this is normal because of engine speed) meaning shorter time for the water to circulate within the radiator.
when this happens and your radiator is dirty inside. poor heat transfer occurs between the cooling medium (water) and the heat exchanger (radiator). you only experience this during high speeds only, right? because when your driving at normal speeds. the flow of water is slower thus it has longer time to circulate within the radiator. this eventually will deteriorate if you will not clean your radiator. scaling occurs inside the radiator when you use tap water. this scaling thickens the wall of the inside of your radiator. when this happens. even when your fan is working normally, it will not be enough to cool the water inside because of poor heat transfer. hope this helps.

[userfriendly]

Sorry if I am hijacking this thread but I have a similar problem.

Yesterday, my totally stock car's temp went up to 3/4 during heavy traffic with aircon on. Today same route, same situation, the temp went up to 1/2. It went back to normal 1/4 after leaving the conjested area. Radiator coolant is new, around 6 months old with 5000 kms.

Checked the car this morning:
No signs of leaks.
Both fans are working.
Coolant, Prestone pre-mixed, level is ok.

Can it be due to cloged or dirty radiator or malfunctioning thermosat? Should I continue to observe for a few days if it will recur or get it checked asap?

[torque2006]

hmmm. no leaks right? everything doing fine (including the thermostat)?

it's a blocked radiator. have it overhauled, and your cooling system flushed.

it's not just the radiator that gets blocked. your engine's water channel could also be a culprit (ergo the cooling system flush).

[CVT]

How about if it's the water pump?- how do I know that the pump is still working okay?

Sorry for hijacking the thread, but my '98 Vanette is overheating when it runs idle (with aircon on) for 15 minutes, or when it runs about 3Km at 2K RPM (no aircon)...

First experienced this overheating after driving the van it for about an hour and then, I stopped to pick up some stuffs (with the engine still running and I am certain that there is no overheating) and drove a few hundred meters.

Checked oil level, water level, fan and fan belts,- all okay. However, I noticed that when I remove the radiator cap, there is no visible sign of water flowing. (Defective thermostat is still suspect).

I brought it to a shop last Saturday and they're recommending overhaul of radiator, telling me that if the water pump is defective, then generally it should be leaking. Have no idea here, so anyone has experience on this, please? TIA



:starwars:

[torque2006]

A. if your fan turns on when the temp reading is half, then your fan's ok. if not, then have your thermostat and fan checked.

B. DISCLAIMER:i'm not telling you your water pump is defective. I'm just answering your question on how to check the water pump. check your water pump for visbile signs outside (rust and leaks). have your water pump replaced when your car needs timing belt replacement:

1. the life of the water pump is almost similar to the timing belt. even if there is no visible leak outside, the insides of the pump could be full of rust and sediments or the "mini propeller" could've been eaten away by the rust.

2. it's cheaper to have the water pump and timing belt replaced at the same time: one labor cost only.

if you do have a blocked radiator: an overhaul would do you good, coupled with a cooling system flush.

you can also try our Lav'Ramon in Autotechnika. It's a cooling system cleaner. We use a cleaning agent to clean your entire cooling system (including water pump and engine's water channel) of dirt, rust, sediments/minerals and water scales.

and guys: use distilled water in your radiator. it's more effective than tap water.

[finchy18]

same din to problem ng friend ko..

car is honda eg crossing 80kph and up nag sisimula na mag overheat.. 3/4 din..

nauubosan talaga sya ng tubig kahit full ang radiator and reservior ..

stop kami ng gas station every 10km ..

nawawala din ang overheat pag city driving...


parang radiator, aux fan, water pump or worst busted head .

[puroy]

same din to problem ng friend ko..

car is honda eg crossing 80kph and up nag sisimula na mag overheat.. 3/4 din..

nauubosan talaga sya ng tubig kahit full ang radiator and reservior ..

stop kami ng gas station every 10km ..

nawawala din ang overheat pag city driving...


parang radiator, aux fan, water pump or worst busted head .

sir, na-check na ba ng friend mo kung nag-engage yung aux fan while engine is on? baka di na umiikot kaya nauubusan sya ng tubig sa rad. just a thought.

[laBorer]

sir, na-check na ba ng friend mo kung nag-engage yung aux fan while engine is on? baka di na umiikot kaya nauubusan sya ng tubig sa rad. just a thought.

pa-check mo din radiator cap, baka busted na. isang dahilan yan kung bakit nauubos ang tubig. hth

[finchy18]

sir, na-check na ba ng friend mo kung nag-engage yung aux fan while engine is on? baka di na umiikot kaya nauubusan sya ng tubig sa rad. just a thought.

sabi nya sir gumagana daw.. so tinignan ko .. gumagana talaga. stop kami ng stop sa gas station kpag na 3/4 sya.. wlang noticeable change ng hatak.. syempre malakas pa din kahit ng 3/4 .. astegg talaga .. hindi kaya mahina lng talaga aux fan nya.. doon sa toyota ko nag 3/4 sya kasi maingay ang fan and need to be replace na..