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Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts
The fan primary function is to keep the magnetron cool while it runs, if the fan stops the thermal fuse senses an increase in temparture causing the oven to shut down. I suggest a tv technician or appliance repair man because there is dangerous high voltage present that can cause serious injury or death.
small engine does take allot to overheat as long as the car stay in motions even though the cooling is not operating, if you were sitting in the heavy and stuck in traffic and the OAT is 98-100 degree with high humidity and running the AC, chances are the engine will over heat quickly. very rare the temp guage become faulty, I would to go ahead and repalce the temperature sensor which gives the guage the correct reading, if have high miles 75k or more replace thermostat which open and close when it reach proper tempature and thermostat switch which turn the cooling fan on and off. all three parts are fairly cheap to fix and replace. all three unit is very important to the engine cooling beside the oil.
You should be able to get a gasket kick from either a dealer or out of Dennis Kirk, Parts Unlimited, Tucker Rocky. It should only be about 4 screws to remove the insides. Just be careful because there is a spring in there.
If the weather in your area is colder than normal, your startup oil pressure will reflect this, essentially because it is much thicker when very cold. This high reading should drop to "normal" once it reaches operating temperature. This condition can also be caused by a sticking pressure relief in the oil pump, usually caused by sludge inside the engine. If you regularly maintain your vehicle and use good quality oil, this should not happen. The oil pressure sending unit is also suspect, but in your case, I would not put it at the front of the list. If oil is close to "change time" consider using a good synthetic oil (synthetics flow better at extreme temps) or using a 5W anything oil during winter months. (see manufacturers specs)
I had the same problem in a 1992 mercedes 300E.....several diagnostic tests were useless. After several trips to the dealer, they replaced the crankcase sensor. This seemed to solve the problem. Also, make sure your oil is good (old oil may cause the engine to overheat and trip a sensor?????)...when I changed the oil, my car ran cooler.