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I can hear the oil bubbling in the heater as it turns on with the thermostat. This has only just started occuring recently. Is that dangerous?

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No,it is pretty normal for a radiator type heater.

Posted on Jul 19, 2010


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TCM Forklift model FCG25-3L will not start when i turn the key to the on postion u can hear the fuel coming out of the intake

Danger of hydro-lock or fuel in crankcase condition will occur. Do not start! Fuel pump relay should be interlocked with oil pressure sending unit. Is it diesel or gas? Is it Carb or fuel injection? Investigate before running engine. Check oil dipstick for presence of fuel in oil. Fire hazard also exist .Be careful.

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see if the carpet is damp on the pass. side . if it is you need to replace the heater core . if it isn't check under the hood for a leak in one of the hoses

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Remove Radiator Thermostat... Is It Okay?

If the problem is not the thermostat, removing it won't help. If you're in a warm climate, you don't NEED the thermostat, but it'll take longer for the car to warm up, and you'll get worse gas mileage while it's cold. Have you done any other work on it recently? Sometimes that behavior is a sign that the coolant system has air bubbles and needs to be bled.
You can bleed the radiator by parking on an incline, with the front of the car higher up (do this when cool), and the radiator cap off - start the car, let it run until warm, then turn the heater on high and let it run for about 10 minutes. Any air bubbles should hopefully burp out of the radiator.

NEVER take the radiator cap off when the car is hot - it's dangerous. Cover the cap with a towel when you remove it, just to be safe.

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Intake manifold gasket I am getting some air bubbles in the recovery tank

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My temp gauge goes up to the hot but doesn't overheat but blows cold air then the gauge will drop to bout half n then start blowin hot air replaced thermostat n a new rad cap could it be the heat sensor

No, because it blows cold air when it gets hot. There is air in the system or the coolant is low. Intake manifold gaskets are a very common problem on these engines and if left unattended to can cause even bigger problems such as head gaskets if the engine over heats too much. Check the coolant level and if it is low, look for leaks at the water pump, radiator and especially the intake manifold where it meets the head. Also, pull the oil dip stick an/or the oil cap to see if it looks milky. If it does, there is coolant getting into the oil.

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1991 Cadillac Fleetwood. The heater was working on passenger side but not that warm. Added antifreeze. Seems to be leaking it. Keep adding. gone thru 2 gallons. How do i get heat.

If you've added two gallons of antifreeze, you need to find out where it's going. Make sure the antifreeze you are adding is diluted with water in a 50/50 solution. Pure antifreeze has little freeze protection and boils quickly. If there is no visible leak, check your oil for coolant contamination. Fill the radiator and leave the radiator cap off. Put the heater controls on hottest setting, but do not turn the heater on. Start the engine and watch the coolant. If the coolant level drops, add more to full. If the coolant is flowing thru the radiator when you first start the engine, the thermostat is stuck open and needs to be replaced. If the water is not flowing, then keep an eye on it and wait for the thermostat to open. Add antifreeze to keep the radiator full. Look for air bubbles or lots of foaming in the coolant. That would indicate a blown head gasket and the reason you are losing antifreeze. If there's no bubbles, and the coolant level stays full, put the radiator cap back on and see if the heater is working better.

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Electric water heater has panels located on front of water heater.
Remove top cover, and insulation to reveal thermostat and element.

Stand on dry surface, including boards or plywood.
Do not hold screwdriver in mouth.
Do not touch any metal.
Red reset button is located on thermostat.
Push in reset.
If reset will not re-engage, then thermostat may be bad, or some other problem exists.
Screw terminals on thermostat are live.
When finished, insulation and cover must be put back over thermostat so thermostat not exposed to cool air that will cause thermostat to misread tank temperature.
Put ear against tank to hear bubbly-fizzing sound that says water heater is working.

If water heater is leaking or wet, do not touch unless circuit breaker is turned off.

Electric water heater is fully repairable by homeowner.
ECO red reset button trips when upper thermostat senses overheating.
You many have underlying problem if reset continues tripping:


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Car overheats and coolant boils

sounds like the thermostat may be sticking closed. i would check to see if the thermostat is opening or not

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Delonghi 5 fin 700/800/1500w, oil filled heater.

It sounds like you have a lemon. The heat exchanger tube has developed a hole somewhere. These things are designed for the small element inside to heat up the oil, and that is supposed to radiate the heat. It would be dangerous to use without any kind of oil. The element would burn out hopefully before it started a fire, but not necessarily. I don't know what kind of oil they use, but its a thin viscosity, like some turbine oil. You can patch the hole and try some pump oil or something, but I personally don't think its a good idea. I wouldn't do it.

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