these cars a prone to air pockets. make sure it's not air locked first. I believe they have bleeder valves to let the air escape. easy way to check the pump is pull a heater hose off at the firewall and put it in a bucket. cap off the open port on the heater core. start the car. if the pump is working the coolant should come out under a decent ammount of pressure. if it's trickleing out or nothing comes out then the pump is done. Also make sure your fan is coming on when it should. people often overlook the fan.
Bad thermostat maybe?
The radiator may be plugged. Take it to a radiator shop.
Not sure if these have one but it could be a bad thermostat.
i have replace the thermostat, checked the fans,filled with water and it is still overheating. Very often, the waterpump leaks and stops working only years after it was last replaced. Coolant is probably not flowing from the engine to the radiator to be cooled.
Get your radiator checked, may have blocked core
If it is not losing coolant I would expect a plugged radiator.
2 things I can think of which need to be checked: your coolant and your thermostat.
Hi have you checked the radiator for blockage if it is blowing water back out the radiator this could be the problem.
it could be your thermostat on the radiator. if it is then you could be causing some severe damage to the engine and radiator. i recommend that you take it in to be checked out. a simple problem like that can lead to something far more damaging and expensive in the long run if let go.
Why is YOUR MB overheating? There are plenty of reasons why, so you should check to see if there is/are: 1. enough water/coolant in the system. 2. leaks....hoses, radiator, seals at the thermostat and water pump. 3. working thermostat 4. working temp sending unit. 5. fluid on the interior foot areas 6. good heater core 7. head gasket leakage Now, is this overheating constant? Is the overheating only when you're at an idle? You would need to check the fan clutch...these go bad all the time and cause overheating. You would need to check the electric fan. Have you checked the radiator for leaks or clogs? If you have the original factory radiator still in the car, chances are it's clogged up
If you have an old ISUZU Trooper, the radiator thermostat may be not working. Therefore, it will not let cool water from the radiator into the hot engine, even if the radiator is full. Have the thermostat checked and replaced, if necessary. Good Luck
The car is overheating. Possibly the thermostat is stuck closed. Have it checked by a mechanic.