Temperature Rising, but radiator is ok!!!???

[tongsatriani]

Agree with Fab. Temp should not rise if cooling system working well while in jam. Air con fan does play a part in cooling off.

Wah! Water talk...very nice...not mean to hijack 520i...

 

[5201]

Originally posted by Lee36328@Apr 12 2006, 04:50 PM
That's why having to top up water in your car on a regular basis is a warning sign which should be looked into, as mentioned in another thread.

Having the temparature go up is never a good thing either... 5201, luckily you caught it in time.

Agreed..... I have had the water pressure test done when i noticed i was losing water in the radiator, but no visible signs of leaks from the normal problematic areas. Guess there are small leaks from the aircon heater, but this is usually not the place to check for leaks. Now we all know better!!

Had i known that i could bypass the heater, would have done so way earlier instead of finding out by having overheated engine!! Thankfully I have trained myself to constantly look at the temperature indicator.... phew....

 

[5201]

Originally posted by tongsatriani@Apr 13 2006, 10:19 AM
Agree with Fab. Temp should not rise if cooling system working well while in jam. Air con fan does play a part in cooling off.

Wah! Water talk...very nice...not mean to hijack 520i...

No prob..... its not hijack per say... its still water talk....

Fabs.... i agree in theory with yr water temp explanation, but it shld not work that way. The engine gets hotter the few minutes its shut off, so its never good for the engine to restart it 1 or 2 minutes of shut off.

Still, the temp gauge should not indicate increase in temp, but remain at the optimal temp range. Even after long 100km++ high speed drives on highways and u take a toilet/coffee/smoke break, yr temp will not raise upon restart of the car... no??

I suspect Tong may have a faulty thermostat, which doesnt open when he re-starts his car to cool the engine, but opens only when he drives off and after the thermostat itself (not the water) gets hot.

Tong, u may have some faulty, or about to be very faulty components in yr cooling system. Have u checked all the components, like thermostat, fan and fan clutch, and the said aircon heater for leaks?? Sounds like one component is about to give way.....

How long had u have this problem??

 

[tongsatriani]

Alamak...freak out liao :beaten:

This raising temp after restart....1st time was 2-3 mths ago as I dun really drive long on afternoons. Now it is a norm after long hot drive (highway, dunno yet)

During the JB convoy, no rise in temp.

Fan clutch & air con fan working well as I do open up & have a look once in a while. Like say, the blow can really dry wet towels & hair!

No loss on water level since radiator changed. Only few hoses changed. No lost in power all this while...u want it, u get it!

The reason why I agree with Fab is, there is a tendency after long drive temp was so hot but maintain as fan & cooling system is running while engine is on. When switch off, nothing is running so during that very short moment water temp increases.

Err....it's all about the Biology wah??! :blink:

 

[5201]

Me no expert in technical area.... but just enuff to kaypohchee....

Still, irregardless of how long a run u had, nor the atmospheric temperature of yr locale, yr temp meter shld not go up.... as once u start yr car, the water pump starts to recirculate the water, and the fan starts to turn to cool it down, immediately.

Just curious..... if yr temp is at 3/4 when u restart, then recover to normal temp..... what happens to the temp if u dont move off (meaning no air cooling or time for the water to circulate)??? Will yr temp stay up, or will it go down after 2/3 minutes (equivalent to u driving 50/100 meters)???

 

[flash]

Originally posted by 5201@Apr 13 2006, 04:04 PM
Me no expert in technical area.... but just enuff to kaypohchee....

Still, irregardless of how long a run u had, nor the atmospheric temperature of yr locale, yr temp meter shld not go up.... as once u start yr car, the water pump starts to recirculate the water, and the fan starts to turn to cool it down, immediately.

Just curious..... if yr temp is at 3/4 when u restart, then recover to normal temp..... what happens to the temp if u dont move off (meaning no air cooling or time for the water to circulate)??? Will yr temp stay up, or will it go down after 2/3 minutes (equivalent to u driving 50/100 meters)???

Hmmm, I am curious too. I used to have the same problem, upon restart, temp is 3/4. Sometimes even very close to RED.

But after I serviced my cooling system and did a top end overhaul, upon restart, only 1/2.... And why did I service my cooling system and did a top end overhaul? Bloody engine overheated.

Me guess I was suffering a slight "heat soak" problem? :dunno:

 

[ALBundy]

Tong, just check your fan clutch and electric fan. It should be that way.

When the engine is shut down, there is no more heat generated, in fact heat will only be dissipated. After changing thermostat, fan clutch, water pump and etc....after say 30 minutes is shut down, the temp level is only around 1/4

 

[tongsatriani]

520i: Hmm...good question...never tried to stay idle when it hit 3/4 after restart. Seeing that, freak out liao la....lali lor...

AlBundy & the Rest: I believe there some parts in cooling system need to be replaced on my ride. Water pump...fan clutch & electric fan (though seems working well)...

B4 owning a UDM, all I thought on other makes is the radiator. Never imagine cooling system so complex one...at least I learn a thing or 4 lor...

 

[iCe]

Originally posted by fabianyee+Apr 13 2006, 12:36 AM-->QUOTE (fabianyee @ Apr 13 2006, 12:36 AM)

 

[5201]

Originally posted by ALBundy@Apr 13 2006, 05:39 PM
Tong, just check your fan clutch and electric fan. It should be that way.

When the engine is shut down, there is no more heat generated, in fact heat will only be dissipated. After changing thermostat, fan clutch, water pump and etc....after say 30 minutes is shut down, the temp level is only around 1/4

Errr... Bro.... dont u mean "It should NOT be that way"??? :dunno: :dunno:

But I totally agree with Bundy here.... it shld cool down after the initial one minute yr engine is off. If yr system is fine... it shld behave as what Bundy says here.... temp goes lower than normal...

Mine does.... :nyehehe: :nyehehe:

 

[jsen]

at 1st i dun really believe on coolant, maybe cox got used to jap car...

until my temp went rising, sigh.. the info i gathered, all require coolant.. so, kiasu a bit, i put 2 bottle in, makin sure its cool enuff.. goin for the actual ratio of 60/40..

i had the same as u guys last month, went to diagnose, pressure test all OK... then no choice, did the easiest precaution, flush radiator.--> works till now.. .. phewwwww..

 

[fabianyee]

Originally posted by jsen@Apr 14 2006, 06:57 PM
at 1st i dun really believe on coolant, maybe cox got used to jap car...

until my temp went rising, sigh.. the info i gathered, all require coolant.. so, kiasu a bit, i put 2 bottle in, makin sure its cool enuff.. goin for the actual ratio of 60/40..

i had the same as u guys last month, went to diagnose, pressure test all OK... then no choice, did the easiest precaution, flush radiator.--> works till now.. .. phewwwww..

u need to use the right coolant..

I think some us us here are using the BMW coolant which is radiator frenly...

Some off the shelf coolants are corrosive...

 

[ALBundy]

Originally posted by fabianyee+Apr 14 2006, 11:47 AM-->QUOTE (fabianyee @ Apr 14 2006, 11:47 AM)

 

[ALBundy]

Originally posted by 5201+Apr 14 2006, 10:47 AM-->QUOTE (5201 @ Apr 14 2006, 10:47 AM)

 

[ersalle]

Other alternatives would be using Castrol's anti-freeze coolant blue colour one. They are phosphate free also.

 

[tongsatriani]

No matter what, it's coming!!! Temp rises to 3/4 while 10 mins in jam today.

Press, press accelerator a bit, gone down. No water loss, infact half full in Exp Tank when check on it. Hot also. No leakage at bottom too. Only cold condense air-con water.

Have to diagnos liao la....

 

[flash]

Originally posted by tongsatriani@Apr 16 2006, 12:25 AM
No matter what, it's coming!!! Temp rises to 3/4 while 10 mins in jam today.

Press, press accelerator a bit, gone down. No water loss, infact half full in Exp Tank when check on it. Hot also. No leakage at bottom too. Only cold condense air-con water.

Have to diagnos liao la....

 

[ersalle]

Based from my experience, there could be 3 faults causing the temperature to rise to 3/4 mark.
1. Fan clutch functioning properly.
2. Radiator clogged. Take note that clogged radiator can also cause fan clutch not functioning properly. I had this experience after bought two brand new fan clutch not working. This is due to the heat is not dissipated onto the fan clutch.
3. Thermostat stuck open.

 

[ersalle]

Oops type wrongly,
Should be
1. FAN CLUTCH not working, worn out.
2. Radiator clogged. Take note that clogged radiator can also cause fan clutch not functioning properly. I had this experience after bought two brand new fan clutch not working. This is due to the heat is not dissipated onto the fan clutch.
3. Thermostat stuck open.

 

[tongsatriani]

Hahaha.... Fault diagnosed! Why my temp reach 3/4? Here is the verdict:

1. Fan clutch was perfect. Speed as per RPM

So, it's either thermostat or water pump. It's the former! RM 45 for a "V" brand thingy, Made In France with sensitivity of 70-75 degrees.

All this while my temp gauge reads slightly after 1/2. Right after changing, it reads a lot slight below 1/2! Chun huh?!

Hmmm...you may wonder why I thought it's the thermo? Coz it's the cheapest to change! Something like fixing from bottom lor...

The old thermo is definitely faulty as the spring can't even be pressed down.

There goes another Temperature story...

THE END