Bad thermostat would be the first thing to check. After that, heater core. I tried replacing the thermostat. No good. I moved to the heater core. Diconnected the hoses and ran a garden hose into it to "flush" it and a bunch of black stuff came out. Hooked it all back up and works great. Not sure where the black stuff came from but it was apparently keeping the coolant from flowing and heating properly in the core.
The coolant leak is pretty cut and dry - you have a leak somewhere. The lukewarm heat (assuming you're referring to the car's heater) could be for a number of reasons. Insufficient coolant could be one of those. Your coolant could be burnt out. It could be a problem with one of your heater hoses. You could have a worn out heater core.
A space heater by itself will not cause a fire. However, not following the space heater safety guidelines may start a fire. Actions that may increase the risk of fire include, but are not limited to: Leaving blankets or clothes on the heater, leaving anything flammable near the heater, and leaving the heater on in an unattended environment.
A bad thermostat can cause a decrease in gas mileage. If the thermostat is stuck open, the engine will tend to run cold. Not only will this result in a perpetually low temperature gauge reading and poorly performing heater. It will also cause the ECU to richen the mixture, since the engine will appear to be warming up to the ECU. This will result in poor gas mileage. Replacing the thermostat will allow the engine to fully warm up, which will restore gas mileage as well as heater performance.
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