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I drive a c-200 diesel estate and ran it for 15 minutes without coolant.The engine stopped and steam came pouring out.I've now had it repaired but there's a continuous knocking noise coming from the engine. Could it be the tappets ?
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That sensor is located in the intake manifold close to or in the thermostat housing......look for a wire plugged into it...Replace the thermostat while you are at it in the right direction for correct flow.......
If your vehicle engine coolant temperature gauge indicates overheating, if you experience a loss of power,or if you hear a loud knocking or pinging noise, the engine has probably overheated. You should follow this procedure............
Pull safe off the road, stop the vehicle and turn on our emergency flasher. Put the transmission in "P" (automatic) or neutral (manual) and apply the parking brake. Turn off the air conditioning if it is being used.
If coolant or steam is boiling out of the radiator or reservoir, stop the engine. Wait until the steam subsides before opening the hood. If there is no coolant boiling over the steam, leave the engine running. CAUTION: To avoid personal injury, keep the hood closed until there is not steam. Escaping steam or coolant is a sign of very hing pressure.
Visually check to see if the engine drive belt (fan belt) is broken or loose. Lock for obvious coolant leaks from the radiator, hoses, and under the vehicle. However, note that water draining from the air conditioning is normal if it has been used. CAUTION: When the engine is running, keep hands and clothing away from the moving fan engine drive belt.
If the engine drive belt is broken or the coolant is leaking, stop the engine immediately and call your mechanic of assistance.
If the engine drive belt is okay and there are no obvious leaks, you may help the engine cool down more quickly by running it at about 1500 rpm for a few minutes with the accelerator pedal lightly depressed.
Check the coolant reservoir. If it is dry, add coolant to the reservoir while the engine is running. Fill it about half full. CAUTION:Do not attempt to remove the radiator cap when the radiator are hot. Serious injury could result from scalding hot fluid and steam blown out under pressure.
After the engine coolant temperature has cooled to normal, again check the coolant level in the reservoir. If necessary, bring it up to half full again. Serious coolant loos indicates a leak in the system. You should have it checked as soon as possible at your mechanic's workshop.
you have a head gasket that is failing. You can confirm this by having the coolant "sniffed" with a four gas analyzer (normally used for emissions testing). If your coolant has hydrocarbons in it than its coming from the head gaskets. They are pretty common for this engine.
Here's the way I usually approach problems such as this. First I'll hook up a scan tool that allows me to see the actual engine coolant temperature is [not just what the gauge says] as the vehicle is being driven down the road at highway speeds. The coolant should be near the 192 - 200 degree range to get the best heat out of the heater. If the coolant temp is below that level then the amount of heat you'll get will drop according. IF the coolant is reaching full temp but the air coming from the heater isn't very warm then you could have a restricted heater core or a temp control door in the ductwork that isn't working properly and is allowing cold air to sneak past the heater core. Usually if you have a water pump impeller problem you'll also have an overheating problem as the pump often isn't able to move enough water through the radiator to keep the engine cool. Hope this gives you a starting point and good luck!
No, you can't add too much coolant. Rather, it does not hurt anything if you do. Did you add it to the radiator, or to the overflow tank?
Let it cool, then remove the radiator cap, and if needed, add coolant to the radiator. Put the cap back on, and fill the overflow tank to the "full - cold" line. Start it and run it a few minutes and look for leaks. If you find no leaks, drive it for a day or two, then let it cool and check it again. If it is down a lot (without overheating), you have a leak somewhere. If you lose enough coolant, that will make it overheat. However, if it overheats, that can cause loss of coolant, when you stop the car, you will see steam and smell coolant, and often hear it boiling.
If it overheats again, make note of when it happens: driving on the highway, or stop-and-go around town. Overheating on the highway usually indicates a clogged radiator, while in-town overheating usually indicates a bad cooling fan (you don't need the fan above about 30 MPH). A bad fan is usually the fan relay, but it can be the fan thermostat (different from the engine thermostat), or a bad fan motor.
most likely a blown head gasket between a coolant passage and an oil passage not a cylinder . when coolant gets into a cylinder is when you will see the white smoke and the smell.
If you are loosing antifreeze with no apparent leak you may have a serious internal engine problem and should seek professional help. Stop driving the truck until you can have it looked at. If you are not loosing any coolant, then Service the cooling system. Drain and slush the radiator, replace the thermostat, clean the radiator fins, pour in a 50/50 mix of antifreeze and distilled water, and bleed all air from the system. Inspect the water pump to see if it is pumping correctly.
The thermostat could be stuck closed.
The worst case is you over heated the engine to the point you could have internal damage to the engine . I would change the thermostat first. IF that does not work , I would take to a shop to have checked out.
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