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Old 02-19-2007, 07:27 AM   #1 (permalink)
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Default need help asap! overheating

hi guys,

need help here!

my engine's overheating but i cant find the cause. coolant is intact and no leak from the radiator. how do i check if the water pump is working without removing major parts? (i have to get through the timing belt housing to do this) i cleaned out the inlet and outlet ports to the engine but found no problem. where do i find the thermostat to check if it's stuck? i think the coolant is not circulating as i observed the open radiator while running the engine.

thanks
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Old 02-19-2007, 09:43 AM   #2 (permalink)
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I have had the same problem in the past,to check your water pump i just sqeeze the rad hoses and if you feel presure when it running then it should be fine i would say that its probably your thermostat but first when your temp gage reaches about half way your rad fan should kick in and if it dosent check your fuse. thermostats are pretty cheap and pretty easy to install,but i hope that its only a fuse cause its pretty cold to be wrenching on a car in this whether .so good luck
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Old 02-19-2007, 10:00 AM   #3 (permalink)
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thanks jayzz,

yup, i think its the thermostat. fuses are ok and the fan is working right. will check out the thermostat next. is it possible for the sensor on my manifold to get faulty?
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Old 02-19-2007, 07:26 PM   #4 (permalink)
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Yup! Check the thermostat, it's on the upper hose of the radiator going to the engine. Meron na tayong thread yan and picture. But the thermostat dun galing sa hi-jet but the same lang size kaya no problem.

Sa Eb may dala akong sample. I put one in a boiling water and it open naman but i have not buy a new one at mahal sa Casa ng Zuki. Iba't-iba pa ang pricing ng casa. Sa Pasig P750, at sa shaw 1K++. nagtanong ako sa Banawe sa Suzuki o Link auto shop at 7oo++ ang benta nila. Sa iba it goes down to 500 but you have to bring a sample to be sure.

Ang nakalagay na thermostat has a temperature of 82 degrees.

Hope this helps.
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Old 02-20-2007, 05:57 PM   #5 (permalink)
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thanks YT!

i bought a new radiator cap (circuit brand) for P150 yesterday before checking on the thermostat. yup, by elimination it really might be the thermostat. the store said better to just remove it anyway we have a hot weather so no problem with cold starts (which is what the thermostat's purpose is for). where in pasig do you buy zuk stuff?
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Old 02-20-2007, 11:51 PM   #6 (permalink)
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E chek mo ang radiator baka, marumi na, maraming na sigurong kalawang..Nangyari na rin sa kin yan, akala ko me crack ang cylinder head, pero wala naman.Kc pag me crack, lalabas sa muffler ang puting usok...e disconnect ang hose ng radiator ,patuyuin lagyan mo ng konting rust converter at e flush after 15min.. Test mo lang, it works for my van.
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Old 02-21-2007, 01:48 AM   #7 (permalink)
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thanks cobalt, was just thinking that. i'm actually in the process of tracing where the problem is. i just removed the manifold output and found no thermostat. so i guess there's no thermostat problem. how do we know if the water pump is not working. the radiator is working well as it drains and fills quickly. and i regularly flush it as well. hope its not a cracked head. thanks guys. appreciate the help.

am going to reinstall the output line from the manifold now.
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Old 02-21-2007, 06:12 AM   #8 (permalink)
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mission accomplished! road tested my yellow cab and no more overheating! did what you said cobalt, thanks! i found traces of radiator sealant and red gasket maker blocking the water passage. apparently the guy who removed the thermostat used red gasket maker instead of the asbestos gasket (which was what i put when i reinstalled it) and some of the residual gasket clogged the whole thing. i flushed the whole cooling system (radiator as well as in the engine) just to make sure. will re flush the radiator again next week just to be sure.

i guess the pressure dislodged the particles when i tried maxing the tach the other day. was changing gears at 5500rpm to clock some speed and just to see how far the gears would push. it was after that that the temo gauge registered at the half mark.

thanks guys for your help!

end of thread... haha! hopefully!
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Old 04-17-2010, 11:12 PM   #9 (permalink)
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Quote:
Originally Posted by isporttrak View Post
thanks YT!

i bought a new radiator cap (circuit brand) for P150 yesterday before checking on the thermostat. yup, by elimination it really might be the thermostat. the store said better to just remove it anyway we have a hot weather so no problem with cold starts (which is what the thermostat's purpose is for). where in pasig do you buy zuk stuff?
Cars need thermostats here in the Philippines and the rest of the world.
I have been a master certified ASE service tech for over 25 years.
I have heard filippino mechanics say "we don't need thermostats its cold in japan"
This statment is FALSE!

isporttrak's comment
"just remove it anyway we have a hot weather so no problem with cold starts (which is what the thermostat's purpose is for)"


this is rubbish and untrue!

Please read about thermostats before you post "your opinion"
A thermostat that is used in automobiles uses an internal combustion engine to regulate the flow of the coolant. When the thermostat is open, the coolant passes through the cylinder head where it looses the heat the air that flows through it. A water pump that is driven from the engine will propel the coolant around the system. When the thermostat is closed the flow is then prevented and the engine is then allowed to heat up to its optimum temperature.

A thermostat operates mechanically. It makes use of a wax pellet which is inside a sealed chamber. The wax is solid at low temperatures but when the engines heats up the wax will then melt and expand. The sealed chamber has an expansion provision that operates the rod that will open a valve when the operating temperature is exceeded. However, the operating temperature is fixed, but it is also determined by the specific composition of the wax. Therefore thermostats of this type can maintain different temperatures, often in the range of 70 degC to 90 degC, which is 160 to 200 degF.

Modern engines are run at over 80 degC or 180 degF, which is quite hot, but it is in order to run more efficiently and to reduce the emission of pollutants. A lot of thermostats contain a small hole in which they vent any gas that might get into the system. In other words, if air is introduced during the coolant replacement. Modern cooling systems contain a relief valve in the form of a spring-loaded radiator pressure cap, that has a tube leading to a partially filled expansion reservoir. Because of the high temperature, the cooling system becomes pressurized to a maximum that is set by the relief valve. The additional pressure will then increase the boiling point of the coolant and that would be above that of the atmospheric pressure.

Just wanted to clear this up for all the mechanics out there who think we dont need thrmostats.
Thanks

Last edited by suzukiscrum; 04-17-2010 at 11:14 PM.
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Old 04-19-2010, 03:28 AM   #10 (permalink)
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Default thermostats.

Quote:
Originally Posted by suzukiscrum View Post
Cars need thermostats here in the Philippines and the rest of the world.
I have been a master certified ASE service tech for over 25 years.
I have heard filippino mechanics say "we don't need thermostats its cold in japan"
This statment is FALSE!

isporttrak's comment
"just remove it anyway we have a hot weather so no problem with cold starts (which is what the thermostat's purpose is for)"


this is rubbish and untrue!

Please read about thermostats before you post "your opinion"
A thermostat that is used in automobiles uses an internal combustion engine to regulate the flow of the coolant. When the thermostat is open, the coolant passes through the cylinder head where it looses the heat the air that flows through it. A water pump that is driven from the engine will propel the coolant around the system. When the thermostat is closed the flow is then prevented and the engine is then allowed to heat up to its optimum temperature.

A thermostat operates mechanically. It makes use of a wax pellet which is inside a sealed chamber. The wax is solid at low temperatures but when the engines heats up the wax will then melt and expand. The sealed chamber has an expansion provision that operates the rod that will open a valve when the operating temperature is exceeded. However, the operating temperature is fixed, but it is also determined by the specific composition of the wax. Therefore thermostats of this type can maintain different temperatures, often in the range of 70 degC to 90 degC, which is 160 to 200 degF.

Modern engines are run at over 80 degC or 180 degF, which is quite hot, but it is in order to run more efficiently and to reduce the emission of pollutants. A lot of thermostats contain a small hole in which they vent any gas that might get into the system. In other words, if air is introduced during the coolant replacement. Modern cooling systems contain a relief valve in the form of a spring-loaded radiator pressure cap, that has a tube leading to a partially filled expansion reservoir. Because of the high temperature, the cooling system becomes pressurized to a maximum that is set by the relief valve. The additional pressure will then increase the boiling point of the coolant and that would be above that of the atmospheric pressure.

Just wanted to clear this up for all the mechanics out there who think we dont need thrmostats.
Thanks
Yes ill second that . Some of the 'expert' mechanics will tell you that its not necessary to use thermostats in the Philippines .....Wrong ! I tested this theory on an F6A engine. Result .....the engine is almost always running too cool. The automatic choke sensor on the carb runs accordingly and hey presto .......always running too rich . Sooty plugs etc etc. Unfortunately ,the failiure rate of thermostats seems pretty high on the F6A motor at least.
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