please help to solve my problem:
1- i connect the radiator fun directley (i make short to contcats of sensor) the fun is always on
2- i removed the termostat
3-i change the radiator with a new one
4- water pump is changed
the tempertsure goes to high when travelling the car upwards on mountain roads ,the water is boiling and going out from the plastic bottle,i disocnect the return water pipe and ther is water going back to the bottle depending on car speed(rpm) ,so pump is working good
also i want to ask aboout radiator fun direction ,now its coonected so that its suck the air through radiator toward the motor,is thats right or it muct blow the air toward radiator
Daweoo Cielo Overheat Problem Please Help ?
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anyaddress
- Posts: 15
- Joined: Thu Jun 14, 2007 7:31 am
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john_trickle
- Expert
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OverHeat Problem
Overheating and Possible Causes
Water pump recently replaced or is it leaking/bad?
Is it leaking?
Do you see good flow coming in the heater return line? Is it the wrong rotation for your car? In 88 they went to a full serpentine system on all F-bodies. The full serpentine setups spun the pump the opposite direction due to belt routing. If yours is a full serpentine(aka one belt) setup, and you just had your pump replaced....and now you have overheating problems. Look at the pump. Does it have extra bolt holes in it for what looks like mounting accessory brackets? If yes, you quite possibly have a 87 and older model. This is flowing water, but not quite enough to keep the motor cool. Also, I've heard of water pumps spinning the impellar on the shaft. This might be happening too.
Timing? Is it set to factory spec?
If the timing is off too far, it can cause overheating
Is the car running lean?
For this you're gonna need a scan tool or a Air/Fuel gauge. If the car is running WAYY lean, it can cause overheating. This can also cause surging at cruise speeds. I don't know what you would do to fix this...but it is a possibility. Too much EGR flowing can cause a surge too, but this is another issue.
Are the fans operating properly?
Are the cooling fans coming on when they should. My IROC has 2 electric fans. The drivers side one will come on when the A/C is on or when the coolant reaches upwards of 236 deg. or so. The drivers side one is controlled by the switch in the head. It comes on at 225 or so. Make sure they work. If they don't, track down the culprit. It also helps to get a lower temp fan switch for the head, but in a high performance motor, the chip will have to be changed to get the drivers side fan to come on at the right time. This is what I had to do to fix my problems.
Is the lower heater hose collapsing?
Get the car good and hot, then stand and watch the lower radiator hose with the car idling. Grab the throttle linkage and rev the engine a coupla times. Does the lower radiator hose collapse some? If it does, replace it...preferrably with one with a wire in it.
Is the heater core leaking?
If the heater core has a pin hole leak, it may be leaking just enough antifreeze to keep the system from building pressure, but not enough to cause a smell. This can cause mysterious overheating problems. If you are losing coolant, this could also be a culprit/symptom of your overheating problems. I have never personally experienced this and my car leaks some coolant...but so far, no overheating problems with my fans fixed.
Replace the radiator cap.
If the cap is original, the spring may not be working properly which would keep the car from building enough pressure and causing it to boil over.
Is the radiator clogged?
Have the radiator flushed. The shop can tell you if it's up to factory spec on cooling. AutoZone sells a good 3 core all metal radiator for 140 bucks or so. Call around, prices on that radiator can fluxuate between stores. I think the price difference between 2 stores...20 miles apart was 20 bucks.
also check the termostat is working.
john
Water pump recently replaced or is it leaking/bad?
Is it leaking?
Do you see good flow coming in the heater return line? Is it the wrong rotation for your car? In 88 they went to a full serpentine system on all F-bodies. The full serpentine setups spun the pump the opposite direction due to belt routing. If yours is a full serpentine(aka one belt) setup, and you just had your pump replaced....and now you have overheating problems. Look at the pump. Does it have extra bolt holes in it for what looks like mounting accessory brackets? If yes, you quite possibly have a 87 and older model. This is flowing water, but not quite enough to keep the motor cool. Also, I've heard of water pumps spinning the impellar on the shaft. This might be happening too.
Timing? Is it set to factory spec?
If the timing is off too far, it can cause overheating
Is the car running lean?
For this you're gonna need a scan tool or a Air/Fuel gauge. If the car is running WAYY lean, it can cause overheating. This can also cause surging at cruise speeds. I don't know what you would do to fix this...but it is a possibility. Too much EGR flowing can cause a surge too, but this is another issue.
Are the fans operating properly?
Are the cooling fans coming on when they should. My IROC has 2 electric fans. The drivers side one will come on when the A/C is on or when the coolant reaches upwards of 236 deg. or so. The drivers side one is controlled by the switch in the head. It comes on at 225 or so. Make sure they work. If they don't, track down the culprit. It also helps to get a lower temp fan switch for the head, but in a high performance motor, the chip will have to be changed to get the drivers side fan to come on at the right time. This is what I had to do to fix my problems.
Is the lower heater hose collapsing?
Get the car good and hot, then stand and watch the lower radiator hose with the car idling. Grab the throttle linkage and rev the engine a coupla times. Does the lower radiator hose collapse some? If it does, replace it...preferrably with one with a wire in it.
Is the heater core leaking?
If the heater core has a pin hole leak, it may be leaking just enough antifreeze to keep the system from building pressure, but not enough to cause a smell. This can cause mysterious overheating problems. If you are losing coolant, this could also be a culprit/symptom of your overheating problems. I have never personally experienced this and my car leaks some coolant...but so far, no overheating problems with my fans fixed.
Replace the radiator cap.
If the cap is original, the spring may not be working properly which would keep the car from building enough pressure and causing it to boil over.
Is the radiator clogged?
Have the radiator flushed. The shop can tell you if it's up to factory spec on cooling. AutoZone sells a good 3 core all metal radiator for 140 bucks or so. Call around, prices on that radiator can fluxuate between stores. I think the price difference between 2 stores...20 miles apart was 20 bucks.
also check the termostat is working.
john
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anyaddress
- Posts: 15
- Joined: Thu Jun 14, 2007 7:31 am
i think the pump is working fine because when i disconnect the return water tube which are connected to plastic water bottle i can see the retuen water and the quantity of returned water increase when the motor run at high speed so my guess pump is working,befor i change the pump ther was a water leak from the old one
is ther is any service manual for my daweeo cielo 1996 thanx
is ther is any service manual for my daweeo cielo 1996 thanx
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goldiegill
- Posts: 46
- Joined: Sat Aug 26, 2006 6:35 am
the engine gaskit must have burnt out.
Anyaddress.
The problem can be with your engine gaskit (the one between the engine block and head). It gets damaged once the car gets overheated. And once it gets damaged, it makes the car to overheat again and again even if you have enough water or the radiator fan remains "always on". One way to check this is to start the car with coolant/water full in water bottle (in which you top-up the coolant/water) and check if there are bubbles coming out of the bottle or there is engine oil mixed in the same. And if the symptoms appear, get the faskit replaced witht a new one as soon as possible. And use a good gaskit.
I find no other reason that your car overheats if there is enough water (revolving in the engine) and the fan is working well. The air direction from fan is also right (it sucks air from the radiator).
regards
goldiegill
The problem can be with your engine gaskit (the one between the engine block and head). It gets damaged once the car gets overheated. And once it gets damaged, it makes the car to overheat again and again even if you have enough water or the radiator fan remains "always on". One way to check this is to start the car with coolant/water full in water bottle (in which you top-up the coolant/water) and check if there are bubbles coming out of the bottle or there is engine oil mixed in the same. And if the symptoms appear, get the faskit replaced witht a new one as soon as possible. And use a good gaskit.
I find no other reason that your car overheats if there is enough water (revolving in the engine) and the fan is working well. The air direction from fan is also right (it sucks air from the radiator).
regards
goldiegill
Goldie