Overheating at High Speed (revs) and uphill

[jeDi13]

My Civic ES is also in a similar situation. I recently had its radiator water drained (found out that the previous owner did not put coolant with it) and replaced with a premix coolant. After a couple of week's use, temperature remains normal. Until one night, I decided to gun the vehicle along EDSA SB from Guadalupe to Ayala Ave just for the heck of it. I floored the gas pedal, and the RPM needle went past 5.5K RPM during the downshift to 2nd gear coming from 1.8K RPM * 3rd gear. I sustained the flooring up to 3 seconds only. After driving it for about 3 kms and upon reaching Ayala Ave, I noticed that the temp needle is already at the 3/4 mark. I immediately went to Shell Edsa McKinley and stopped the engine for about 15 mins. Popped up the hood and found that the water reservoir was full and there's no more water in radiator. After filling it up with tap water, I headed back home without a problem.

I used the vehicle again the next day. Temp was normal during the whole travel along Katipunan to C5 with moderate traffic until I reached Bagong Ilong flyover when the temp needle started to go to 3/4 again. Went to the side of the road and stopped the engine for 10 mins. Went to Petron McKinley for a water refill and didn't had any problems again.

After that incident, I decided to drain-replace the water for a few times using distilled water. Used the vehicle after every procedure so that water would circulate. On 4th drain, I decided to add premix coolant. So far, no more rising temp. However, I only had short trips (20 kms in light traffic compared to 20 kms from Katipunan to C5 in moderate traffic) so I can't really say that problem is over.

Any comments on the reason of the rising temp on the two separate occasions? Now I'm starting to think that flooring the pedal was foolish. By the way, both fans are working (just don't know if at normal speed). The water pump's fine too, according to a mechanic as he observed the water in the radiator with the cap taken off while I was revving the engine.

I was able to use the car again in moderate to heavy traffic, 20 kms distance covered, in 1.5 hours. I just noticed that the temp needle is "higher than usual", probably 1-3 lines higher, with A/C turned on the whole time. Usual temp needle is at 2-3 lines below the mid line. but now on traffic, it reached the exact mid line. this doesn't happened before. it is just usually below the mid line even on heavy traffic. is this a sign of a clogged radiator as what JohnM mentioned before, or there's nothing to worry about as it's still within "normal" operating temp? car is 2002 Honda Civic VTi-S. Thanks!

[JohnM]

High temp in traffic is most likely caused by a weak fan. Check your fans for unusual noises or alog. With the fans on feel the strength of the air coming out. Kung medyo mahina time to replace the motor na. Try to observe the temp din with the AC off in similar conditions. Kung bumaba most likely fan nga ang problem. Silipin mo na rin ang outside fins ng rad baka barado na. Number one kalaban dito balahibo ng aso o pusa

Coolant leaks could be another cause. Nasilip mo ba ang radiator and reservoir kung may laman pa after that incident?

[jeDi13]

Thanks again JohnM.. Yup, checked the radiator and reservoir, both are always full since the incident. I always check them before using the vehicle and no need to top up. Iniisip ko nga, baka barado like what you said. Sige, I'll check the fan motors na rin, but last time I checked, they are still quite strong. Kakalagay ko lang kasi ng Honda coolant kaya nag-hhesitate pa ako magpa-radiator cleaning. So far, yun palang naman na-notice ko. At least the car can now survive moderate to heavy traffic without overheating.

[jeDi13]

Add ko lang, tama JohnM, mas mababa ang temp with A/C off, kahit pa heavy traffic (tagaktak-pawis nga lang ako hehe). Ang hirap kasi i-measure yung strength ng fans by just feeling them with bare hands. Kung ako lang tatanungin na hindi expert at hindi laging nagccheck ng fan speed, hindi ko rin masasabi ang difference, unless significantly different na.

Anyway, thanks again JohnM. mukhang marami ka nang napagdaanan sa cooling system ng kotse mo ah hehe.

[JohnM]

Anyway, thanks again JohnM. mukhang marami ka nang napagdaanan sa cooling system ng kotse mo ah hehe.

Been there done that

Iniwanan ko nga ng checklist si kumander nung nag-abroad ako for a month so she'll know what to check kung tumaas ang temp. Natuto din sya maghanap at mag-epoxy ng butas sa radiator :hysterical:

[baludoy]

ask ko lang, ok ba mag top-up ng reservoir using distilled water kung pre-mix coolant ang nakalagay sa cooling system mo?

kasi nang nag-palit ako ng coolant last month kinulang na iyong honda type 2 coolant na nabili ko ( 1 galllon jug). eh napaka-hirap mag-hanap pa naman dito ng type 2 coolant sa atin so sa reservoir may halong distilled water na nailagay ko

[gutz_3110]

ask ko lang, ok ba mag top-up ng reservoir using distilled water kung pre-mix coolant ang nakalagay sa cooling system mo?

kasi nang nag-palit ako ng coolant last month kinulang na iyong honda type 2 coolant na nabili ko ( 1 galllon jug). eh napaka-hirap mag-hanap pa naman dito ng type 2 coolant sa atin so sa reservoir may halong distilled water na nailagay ko

pag naglagay ba ng coolant, hindi na kailangan maglagay ng tubig? o pwede mix? o dapat distlled water? or how long should i check kung maglalagay na ulit? sorry, old school ako, nasanay ako ssimula bata na tubig lang ilalagay every now and then.

[1D4LV]

ask ko lang, ok ba mag top-up ng reservoir using distilled water kung pre-mix coolant ang nakalagay sa cooling system mo?

kasi nang nag-palit ako ng coolant last month kinulang na iyong honda type 2 coolant na nabili ko ( 1 galllon jug). eh napaka-hirap mag-hanap pa naman dito ng type 2 coolant sa atin so sa reservoir may halong distilled water na nailagay ko

you still have to top up with a coolant mixture, otherwise, hindi na tama ang magiging mixture ng coolant and water sa radiator and makina mo pag-ikot ng fluid.

[1D4LV]

pag naglagay ba ng coolant, hindi na kailangan maglagay ng tubig? o pwede mix? o dapat distlled water? or how long should i check kung maglalagay na ulit? sorry, old school ako, nasanay ako ssimula bata na tubig lang ilalagay every now and then.

mixed or premixed pa din.
you should check it regularly. ako every week... check lang naman ang level ng coolant sa reservoir eh.

[baludoy]

you still have to top up with a coolant mixture, otherwise, hindi na tama ang magiging mixture ng coolant and water sa radiator and makina mo pag-ikot ng fluid.

so anong direct consequence nito bro? mag- overheat ba siya over time ( or iikli ang period of effectivity niya) even though majority ng laman ng cooling system iyong type 2 coolant?

[1D4LV]

so anong direct consequence nito bro? mag- overheat ba siya over time ( or iikli ang period of effectivity niya) even though majority ng laman ng cooling system iyong type 2 coolant?

definitely, iikli ang period of effectivity nya..... pero again, you have to change coolant every year.
ang magiging effect lang nya are:

a) proper mixture of coolant and water (1:1 rate), gives you a higher boiling point compared to lets say 80% water and 20% coolant.
b) using coolant minimizes risk of radiator corrosion and formation of rust.

[gutz_3110]

mixed or premixed pa din.
you should check it regularly. ako every week... check lang naman ang level ng coolant sa reservoir eh.

i see. so reservoir, not radiator itself. thanks!

[EVO-V]

definitely, iikli ang period of effectivity nya..... pero again, you have to change coolant every year.
ang magiging effect lang nya are:

a) proper mixture of coolant and water (1:1 rate), gives you a higher boiling point compared to lets say 80% water and 20% coolant.
b) using coolant minimizes risk of radiator corrosion and formation of rust.

a) 1:1 That also gives you lower coolant thermal conductivity. 30-70 is fine in most cases.
b) Can't amen enough to this.

[StarLord]

May tanong ako mga bro, 2nd hand lang auto ko. 1st ay nung na-diagnosed na radiator cap pala yung may problema pero after that, pag paakyat kami ng batasan hills, nasa 3/4 yung sa panel sensor ko pero pag traffic, 3/4 pa din siya. pero nung pina-check ko ulit sa mekaniko, nakita na sira na yung thermostat kaya tinanggal na siya. After that, nung paakyat na naman kami ng batasan, nag-3/4 na naman siya pero pag traffic, nasa 1/2 lang yung panel sensor ko. Heto po tanong ko:

1. Ano kaya yung possible na problema? Radiator overhaul muna or Head Gasket/Cylinder Head check up na?
2. Ok lang ba tumakbo ng walang thermostat lalo sa long drive?

Btw, Honda Accord 2000 po ang ride ko. Thanks po sa makakasagot

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May tanong ako mga bro, 2nd hand lang auto ko. 1st ay nung na-diagnosed na radiator cap pala yung may problema pero after that, pag paakyat kami ng batasan hills, nasa 3/4 yung sa panel sensor ko pero pag traffic, 3/4 pa din siya. pero nung pina-check ko ulit sa mekaniko, nakita na sira na yung thermostat kaya tinanggal na siya. After that, nung paakyat na naman kami ng batasan, nag-3/4 na naman siya pero pag traffic, nasa 1/2 lang yung panel sensor ko. Heto po tanong ko:

1. Ano kaya yung possible na problema? Radiator overhaul muna or Head Gasket/Cylinder Head check up na?
2. Ok lang ba tumakbo ng walang thermostat lalo sa long drive?

Btw, Honda Accord 2000 po ang ride ko. Thanks po sa makakasagot

[jodski]

When was the last time na nag flush ka at nagpalit ng coolant? You might want to try that out first or pasabay mo na sa radiator overhaul before trying anything elase
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[RomeoAlpha]

Sir jodski wala pong kinalaman coolant sa pagtaas ng temp, ang trabaho lang po ng coolant is to prevent water or the liquid from boiling.

To starlord: ano ano ba observation mo?

1. Ung tubig ba ng radiator mo pumupunta sa reservoir at minsan umaapaw? If yes, top overhaul na iyan.

2. Hindi naman napupuno ung reservoir mo, pero nauubos pa nga, pati sa radiator nababawasan. If yes, palit hoses, palit clamps, pakiskis mo maigi ung mga connection na dapat labas ung bakal, minsan kasi may maliit na butas na hindi gaano napapansin lalo na kung may mga dumi.

3. Anong pressure ng rad cap mo, .9 (13psi) or 1.1 (16psi), stay with .9 baka kasi may onting singaw na head gasket mo at sa cylinder pumunta, naloko na pag ganito. Tapos kung tinaasan mo na at nauubos pa din tubig sa radiator, it is either may leak hoses mo, sira radiator mo or may onti ka ng leak sa head gasket.

4. Ipabalik mo thermostat, importante yan baka kaya naka. 3/4 yan kasi manipus masyado tubig sa sa water jacket ng makina dahil umaapaw lagi.

5. Maigi din magpalit ka na lang ng radiator, di kasi ako fan ng linis kasi napakaliit ng radiator ng accord. Nasa 2.5k to 3.5k kay LVC in Banawe ang new set of radiator (may fb sila at posting sa sulit).

6. Since napagusapan na din ang coolant, bili ka toyota super long life coolant, yung premix, 300 petot sa casa at 300 petot sa auto supply. Bili ka 2 bottles (tig 2 liters ang isang bote) no need haluan ng tubig. Bakit ito? Kasi kung may leak ka sa hoses makikita mo agad. Dahil pula ito at pagnatuyo pula pa din, heheheh.

Hth.

[JohnM]

I agree with rad cleaning, use coolant and reinstall thermostat. Kung matagal na syang tubig lang ang gamit rust will form and accumulate inside the radiator, blocking the tubes and lowering its efficiency.

Kung wala kang thermostat the coolant will flow quickly through the radiator at high revs at wala na syang chance mag-stay at magpalamig sa radiator.

[StarLord]

Hello!

Thanks po kay Sir Jodski, Sir Romeo at Sir John M.

As of now, dinala ko na yung sasakyan ko dun sa talyer na taga honda mismo. Ngayon, binaba namin yung radiator na nanlilimahid na sobra sa dumi, for overhaul siya ngayon. Sa mga hoses naman niya, ok pa naman ang lahat dahil wala pong leak. Then yung thermostat, i-rerebuild namin siya pag everything goes ok. yung tipong di na aakyat yung temperature sa panel ng 3/4. I know na very important yun kaso yung previous owner ng sasakyan, tinanggal yung sensor sa thermostat pero kaya naman i-rebuild yun.

Nung binili kasi namin yung sasakyan, after ng 2 drives ko to cubao, umiinit siya then nung tinignan ko yung sa radiator, ang gamit lang is tubig then one time nga pagka-uwi ko dito sa amin, kumukulo sa resevoir so sabi ko, may problema nga, ginawa ko, nag-flushing ako then I use prestone ready to use coolant, ok naman kaso pag nakatakbo na ako ng mga 7 kms, nakita ko na ganun na naman at natapon yung coolant. so nung pina-check ko sa servitek marikina, radiator cap replacement na.

Sir Romeo, ano po ang difference ng .9 at 1.1 sa radiator cap? same size lang po ba yun and ano po ang benefits?

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[Ry_Tower]

Hello!

Thanks po kay Sir Jodski, Sir Romeo at Sir John M.



Sir Romeo, ano po ang difference ng .9 at 1.1 sa radiator cap? same size lang po ba yun and ano po ang benefits?

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And difference is mas madali mag-ope yung 0.9 psi vs 1.1 psi. Dapat kung ano original na requirement nang sasakyan ay yun susundin. If hindi ka sure, I suggest you use the rad cap na may 0.9psi rating just to be safe. Same size yan, yung spring lang ang magkaiba kasi nga ibang pressure rating nila eh.

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Hello!

Thanks po kay Sir Jodski, Sir Romeo at Sir John M.



Sir Romeo, ano po ang difference ng .9 at 1.1 sa radiator cap? same size lang po ba yun and ano po ang benefits?

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And difference is mas madali mag-ope yung 0.9 psi vs 1.1 psi. Dapat kung ano original na requirement nang sasakyan ay yun susundin. If hindi ka sure, I suggest you use the rad cap na may 0.9psi rating just to be safe. Same size yan, yung spring lang ang magkaiba kasi nga ibang pressure rating nila eh.

[miked]

Hello!

Thanks po kay Sir Jodski, Sir Romeo at Sir John M.

As of now, dinala ko na yung sasakyan ko dun sa talyer na taga honda mismo. Ngayon, binaba namin yung radiator na nanlilimahid na sobra sa dumi, for overhaul siya ngayon. Sa mga hoses naman niya, ok pa naman ang lahat dahil wala pong leak. Then yung thermostat, i-rerebuild namin siya pag everything goes ok. yung tipong di na aakyat yung temperature sa panel ng 3/4. I know na very important yun kaso yung previous owner ng sasakyan, tinanggal yung sensor sa thermostat pero kaya naman i-rebuild yun.

Nung binili kasi namin yung sasakyan, after ng 2 drives ko to cubao, umiinit siya then nung tinignan ko yung sa radiator, ang gamit lang is tubig then one time nga pagka-uwi ko dito sa amin, kumukulo sa resevoir so sabi ko, may problema nga, ginawa ko, nag-flushing ako then I use prestone ready to use coolant, ok naman kaso pag nakatakbo na ako ng mga 7 kms, nakita ko na ganun na naman at natapon yung coolant. so nung pina-check ko sa servitek marikina, radiator cap replacement na.

Sir Romeo, ano po ang difference ng .9 at 1.1 sa radiator cap? same size lang po ba yun and ano po ang benefits?

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yung ratings indicated sa radiator cap is the opening pressure. the radiator cap raises the boiling point of the coolant, be it plain water or mixed. the higher the pressure, the higher is the boiling point. say 1.1 kpa (gage pressure) raises the boiling point to 104 deg C (not sure on the number) pero the point is, it raises the boiling point (compared to 100 deg Celsuis at atmospheric pressure of 14.7 psi, 101325 pa, etc.).

kapag tinanggal mo ang cap, the boiling point is 100 deg C. lagyan mo ng cap, higher than 100 C. higher P, higher T.

for the record, hindi totoo na ethylene glycol (prestone coolant, etc., etc.) prevents boil-over of the engine coolant...."it raises the boiling boilng of the coolant mix to certain degree (depende sa mix)". same same sa function ng radiator cap.

ibalik mo thermostat nyan asap. ganun din yang sensor circuit for the fans. regarding hoses, dapat hindi masyado matigas ang upper hose (bypass hose included) at di rin masyado malambot ang lower hose.

maiba tayo ng usapan, baka naman hindi kunektado sa cooling system yang problem ng auto mo. like leaking head gasket, tight bearings, lubrication problem, etc.