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Your fuel sending unit is probably bad. It is located in the fuel tank and the fuel tank must be removed to replace it.
Your engine will get the best mileage at full operating temperature. If the thermostat is removed or too low a temperature unit the engine will use more fuel.
Follow the upper radiator hose to where it meets the engine, that's where you'll find the thermostat. If it's an easily accessible location it is simple to change, it can just get messy if you have a full cooling system. I have a 96 caravan and it took me more time to scrape off the old gasket material than it did to remove and replace the thermostat.
Thermostat stuck open. Replace.
Check the level of coolant. If the level is full, replace the thermostat.
AnswerYup, in most cases. Check the thermostat.
Remove the top main radiator hose (between the cap and the motor head) from the motor head (held on by a Spring Clamp). Then remove the 2 bolts that hold the thermostat in place & then the gasket. Replace both parts (gasket and thermostat) secure the bolts, reattach the hose... remove the radiator cap and start the engine. Add 50/50 Antifreeze mixture until the reservoir is "full" (running engine during this process for about 5-10 minutes to remove air in line). viola...
If it is overheating or taking a long time to reach full operating temperature then it may need a new thermostat. If you even suspect it is not functioning properly just replace it.
No You don't Need to change the water pump But you should change it and the thermostat if radiator was full of sludge. if not then no to both.
Yes. Your engine will get the best mileage at full operating temperature. If the thermostat is removed or not working properly causing the engine to become too hot or not hot enough it will affect the operating efficiency or your engine which will decrease your gas mileage.
Assuming RAD stands for radiator . . . Chances are your thermostat is stuck closed. Replace it.
check or replace coolant thermostat or bleed the coolant system