Check the fan. If you have an electric fan, verify it comes on when the car is at operating temp. If you have a 'clutch' fan you can verify it's working by starting the car and listening for the fan to change pitch or 'roar' when it warms up. This can be quite noticeable on larger fans (NEVER put your hands anywhere near a moving fan. Keep a safe distance). With the engine off check the fan for excessive movement (clutch type) by rocking a fan blade back and forth. There should be little or no play. If your fan is attached to the water pump this is also a good way to check it's operation. Again, there would be little or no play. Despite the popular myth, your car NEEDS a thermostat. Do not remove it from operation. To properly check a thermostat, remove it from the vehicle and place in a pan of hot water of approximately the same temperature (usually stamped on the thermostat - but not always). Generally, if it opens - it's good. Check your manual for the proper temperature range and replace if found defective. You can also check water pump flow by leaving the thermostat out of the housing. Re-fill the car with water and run the engine with the radiator cap off. Once filled, you should easily be able to see a 'current' flow by. If your view is blocked, rev the car once or twice. Water should come flowing out of the radiator at a pretty good rate. Don't forget to replace the thermostat.
If your car stays cool at lower speeds and all of the above checks out ok but your car still overheats at high speeds, it's probably the radiator. With the engine warmed up sitting at an idle, measure the temperature of the upper and lower tanks. There should be (ideally) a 40+ degree differential with the upper tank being hotter (obviously). Even if the overall temperature is not exceeding the maximum heat range, a lower differential indicates a problem and the radiator needs serviced or replaced. Example: If the top tank is at 195o (normal operating temperature) but the bottom tank is a 185o then the radiator needs serviced. Water is not cooling before it heads back into the engine and at high speeds, this will just get worse.
Also , re-check the lower hose. On some cars I have seen this hose collapse after the engine warms up, restricting flow. Even though the hose appeared to be in good shape. There are also some engine conditions relating to fuel mixture (a 'lean' condition) that can cause overheating, but this is rare on any newer cars.
Changing a radiator in a 1997 Pontiac Grand Am can be a difficult task. To remove the radiator, all of the radiator hoses will need to be disconnected from the radiator. The transmission lines will also need to be removed. After all of the hoses are disconnected, remove all of the clips that are holding the radiator in place. Lift the radiator up and place with a new one. All the hoses and clips will need to be put back in place with the new radiator.
If the hoses are all tight, Then the radiator must be leaking. REPLACE RADIATOR
the hoses leading to and from your radiator might be clogged. If you had a rusty radiator, the rust may have clogged the hoses that carry the coolant. you should check all your hoses and even flush them out.
Lower radiator hoses in water cooled engines are return lines. The upper radiator hoses are feed lines of hot engine water to the radiator. The reason that lower hoses are cooler is that the radiator has allowed much of the water's heat to dissipate into the air. Thus, a lower radiator hose contains cooler water than other radiator and heater hose lines.
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All the hoses go soft and explode.
Drain the radiator, disconnect all hoses from the radiator, remove the fan shroud, loosen all radiator mounting brackets, remove the radiator. Replacement is the opposite order.
sounds like water pump.check radiator hoses as well
Your Car Hase A Closed Cooling System. So Your Hoses Will Feel Hard While The System Is Hot. When It Cools They Should Be Somewhat Soft Without Cracks In Them Or Deteration. If They Are You Need To Have All Hoses Checked And Replaced As Required. More Engines Are Destroyed By Overheating Than Oil Loss By Far. Best To You
Before we come to the best manufacturer of hoses in India, first let me explain you briefly the what is radiator hose. Radiator Hose Large-diameter rubber tubes called radiator hoses transport engine coolant from the engine to the radiator and then back to the water pump. To preserve their integrity, radiator hoses should be examined as part of normal maintenance. Basically radiator hoses are called automobile parts. It is used in engines in every kind of engines. For more information contact us here: shrivinayakrubber .com Best Radiator Hose Manufacturer Let's talk about the best radiator hose manufacturer in Delhi, India. "Shri Vinayak Rubber" is one of the leading manufacturer and supplier of high quality rubber parts for automobiles, radiator hoses are one of them. They provides all kind of hoses for our needs at an affordable prices.
When this problem happens I would always replace the stat first.Make sure you bleed all the air out of the cooling system by allowing the car to run at idle for about 30 minutes with the rad cap off.
To keep your engine from overheating the coolant runs from the radiator through the hoses into the block and back through the hoses into the radiator where it gets cooled by the fan and the air and starts the process all over again.