Coolant problem i notice lately after a long drive my car overheats couple months ago i replaced the fan motor low side they both work now and the coolant res. short drives im fine but if im driving for a long period of time like from greenville nc to havelock nc then to jacksonville nc then back to greenville my needle started going up why dodge intrepid 2.7

If your 1998 Cutlass is overheating and the heater is blowing out cold air, and you are also noticing that coolant is leaking out, there are a few possible causes. Here are some things to check:

Check for a coolant leak: Start by checking the engine and radiator for any visible signs of a coolant leak. It's possible that a hose or other part of the cooling system may be damaged or loose, causing coolant to leak out.

Check the radiator: If the radiator is not working properly, it can cause the engine to overheat. Check to make sure the radiator is not clogged or damaged.

Check the water pump: The water pump circulates the coolant through the engine. If it's not working properly, coolant may not be flowing through the system correctly, causing the engine to overheat.

Check the cooling fan: The cooling fan helps to keep the engine cool by pulling air through the radiator. If it's not working properly, the engine may overheat.

Check the thermostat: Even though you recently replaced the thermostat, it's possible that it's not working correctly. A faulty thermostat can cause the engine to overheat.

It's important to address any issues with the cooling system as soon as possible, as overheating can cause serious damage to the engine. If you are not comfortable diagnosing and repairing the issue yourself, it's recommended to take your car to a qualified mechanic.

Check your coolant reserve tank and fill it if needed.

If the coolant is fine try flushing the heater core, follow ChrisFix's instructions in the vid linked below.

How to Flush Heater Core Safely with garden hose

As a side question:
Were there any loose wires that could have been caught near the fan when you replaced it? They'll make a buzz noise if they're touching the fan blades.

Time for Intake Gaskets and possibly head gaskets, very common problem with these, the intake gaskets go bad and the coolant actually burns in the cylinder and of course the cylinder pumps air into the coolant system because of intake gaskets being bad. :-(

On some Camrys the radiator fan is run by hydraulic pressure from the power steering pump. I think the sensor you mention is the engine coolant temperature sensor, which is in the circuit which operates the fan when the engine becomes hot. If this fails the engine will overheat, yes. The fan does not cool the hydraulic fluid from the pump.

If your power steering fluid gets low the same thing can happen, but you would notice immediately as the steering would become intermittently harder.

Instrument cluster - GM had problems with a part inside the cluster , Stepper motor , These faulty step motors caused the gauges to act erratically . 2003 to 2006 ! ALL GM vehicles . Just replaced a cavalier instrument cluster for what customer thought was a over heating problem .The fans come on low speed when engine temp. reaches 220 degress
The PCM commands the low speed cooling fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 104.25°C (220°F).
• A/C refrigerant pressure exceeds 1447 kPa (210 psi).
• After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 101°C (214°F) the low speed fans will run for a minimum of 60 seconds After 60 seconds, if the coolant temperature drops below 101°C (214°F) the fans will shut OFF. The fans will automatically shut OFF after 3 min. regardless of coolant temperature.
The PCM commands the high speed fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 107.2°C (225°F).
• A/C refrigerant pressure exceeds approximately 1824 kPa (265 psi).
• When certain DTCs set.
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed if required. This insures idle stability by preventing the fans from cycling between high and low speed.

I would look at two thing, the fan and the radiator itself. If you have an electric fan, make sure that it is working by connecting it to the battery directly, I would also test the fan relay. An engine driven fan that has a fan clutch may need the fan clutch replaced, it's the disk looking thing mounted on the shaft with the fan.

Assuming those are okay then you want to look at the radiator itself. It may be clogged internally and need a good flushing out or it can be clogged externally buy road gunk clogging up the fins, you can usually wash that out from the engine side with a garden hose sprayer but you'll probably have to remove it to do a good job

You also want to look for any signs of leakage. An overheat can be caused when coolant leaks out and the coolant level drops to to low a level to adequately carry heat out of the engine. If you notice the cabin heat gets low when the engine is idling this is an indicator of low coolant. Leakage can occur internally to the engine as well. Burning coolant has a very specific smell if it's leaking past the head gasket into the combustion chamber. If it's leaking into the engine block you'll see what looks like coffee and cream colored sludge in the oil, sometimes on the dipstick, or brownish coolant in the radiator.

I would also check the radiator cap for pressure leaks. The pressure raises the boiling temperature of the coolant to well above normal operating temperature. If it's leaking then coolant could be boiling away while you drive until it gets low enough to over heat, your nose will tell you if this is the case, you should never smell hot coolant under normal circumstances. The cap should be replaced every three months anyway.

check engine temp sensor if ok check fan relay

it sounds to me like you need to drain and refill the radiator and also replace the thermostat and change the drivebelt if the car has over 40,000miles and also check the bottom of the coolant reserviour for any cracks because this will cause the car to over heat also

Hi,
The heating up as you build revs, to me, indicates a partially oped thermostat. If it hasn't been replaced, I would do so. It's inexpensive and easy enough to do. Make sure you get a gasket with it.
The rattling thing is another matter. Do you think it is the water pump that is rattling? Does it ever drip from under your engine all the time?
Just curious...
Hope this helps... Good luck!

broken fan belt water pump dont turn water dont circulate its gonna overheat alternator dont turn battery light stay on you said the bottle was full and when it cool down it was on low level that normal radiator took back what it was missing check the belt HOPE IT HELP FIXYA OUR POST THANKS PIERRE