Flushing the radiator may help with the cooling problem but not necessarily make the engine run smoother. If it is a 6 cyliner engine check for a possible leaking lower intake manifold gasket. If the LIM gasket is bad, it may be leaking coolant into the oil and possibly into the cylinders. Also it may leak externally or it may leak internally. Go to http://www.gaoc.com for more info on this problem. If this is the case, it is a serious problem and you shouldn't drive the car until you get it fixed. I have owned these cars in one form or another since 1994 and the radiator leaves a lot to be desired. The radiator seems to clog very easily. So it requires a lot more maintenance that GM likes to admit. I have never had a problem with the thermostats and only had one water pump failure. I also have never had a problem with the fan but, like others have said, they should be checked as well GOOD LUCK!! Sometimes having the radiator flushed will help; however, it may be your themostat is sticking causing the motor to run hot. If this is the case, you should get a new themostat installed. Also check that the fan is running with the engine hot and in idle. The fans wear out may need replacement. It may also be the fan control circuit. I had that problem! Make sure your radiator cap is not missing the seal! Without the seal pressure is not kept in which will cause the engine to overheat! Simple problem, cheap fix!
Your truck is overheating because it needs a new radiator. I had the same problem, after I installed the new radiator and flushed out my remaining cooling system I never had a overheating problem since.
Either the water pump impeller is loose on it's shaft, or you have a leaking head gasket.
The radiator on a 1999 Pontiac Grand Prix is flushed by draining the coolant, filling the system with water, adding a liquid flush to the system, and running it for a few minutes. The system is then drained, flushed with fresh water, and refilled with coolant.
Check the water pump
Engine overheating is a good indicator. Some people get them flushed regularly as part of regular maintenance.
Water pump defective.
Bad thermostat maybe?
The radiator may have debris that needs to be flushed out.
you must be a wierdo.stupid.
you probably need a new radiator and get the engine back flushed while your at it.
Low coolant? System air bound? Hoses collapsing under pressure? Water pump not circulating coolant?
The manufacturer recommends flushing the radiator every 30,000 miles. The radiator should be flushed once every two years regardless of the miles.
you need to have it flushed
You need to have the radiator flushed immediately
How do you know it is overheating if you have taken the temperature gauge out? Facetiousness aside, it might be worth checking the thermostat switch that stops water circulating to the radiator when the engine is cold.
Is it at the correct fill level ? If the radiator is old it is possible some corrosion has blocked up soemwhere and the radiator may need anther draining and flush through with water till it clears out.
sounds like you have a cracked head or cracked block.however, i would check to make sure it is not transmission oil and thereby ruling out a radiator problem
take out the hose out of the radiator. then put a hose in the radiator hose, and let the car run with the heat on. it will take about 10 minutes. the coolant will be coming out of the radiator. then once the radiatior is leaking clear, you can put the hose back on, because it is flushed out.
The radiator on a 1999 Mercury Cougar is flushed by draining the radiator, filling it with water, and adding a commercially available radiator flush. The engine is allowed to circulate for 10 minutes, drained, flushed with fresh water, and refilled with coolant.
It could be a clogged radiator or cracked head or bad head gasket.
could be the water pump That is a typical symptom of an air lock in the cooling system
I would start at the thermostat. Problems with the radiator and head gaskets are usually presented as visual leaks. But clogged passages in the radiator would also cause overheating issues, so have the cooling system flushed.
The radiator on a 98 Buick Century is flushed by turning the petcock to drain the coolant. Water is then flushed through the system until all contaminants are removed.
Sediment blockage. You need to have your radiator power flushed to get all the build-up out.
If it has electric fans, make sure they are coming on when it get's hot. If not, then check the fuses and relays for them and power to the fans. Might just be a relay for the fans.