electric fan question?

Question

been having a problem with my coolant system. i already asked this question, see below:
Member since: February 27, 2007
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john G
S My car has a coolant problem!?
i have a 1994 olds cutlass. For the past 2 months it will say coolant level low, but i go fill it and it only adds a little if needed. The light for low collant level comes and goes as i am driving it, everyday. Today driving home, my check engine light came on and notice my car was overheating and the low coolant light was on. Then when i drove on , the temp dropped fast and went back to normal. Could it be the thermostat is bad, or maybe something is in the radiator blocking some flow? .........................................

now i am flushing the radiator now, while it was running noticed fan did not come on? but temp was normal while running? Is it supose to be running?

Answer 1

if the fan is working the you might have an intake coolant leak. the 3.8 Lt. engines are bad about leaksat the intake manifold.

Answer 2

Could be a thermostat or radiator cap problem or fan sensor. Radiator caps are often overlooked. They are designed to relieve pressure if it gets too high. If your car has the wrong cap it may release too early or too late. If you are having the radiator flushed, replace the thermostat and radiator cap as well. Be sure to check the specs for your engine and model. If you have an auxiliary electric fan it should only go on when the heat level goes up.

This is tricky because a bad fan sensor will cause the sudden spike up then down again symptom but not the coolant loss, so will a malfunctioning thermostat. A bad cap will cause you to loose coolant. I would do them all.

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Answer 3

So many questions...First, it sounds like you have a bad temp. sending unit and possible stuck / defective thermostat, however, you are off to a good start by flushing the system. Now would be the time to check/replace the above. The fan doesn't run continually, only when needed to cool the radiator. It too is controled by a temp. sensor.

Answer 4

It will only come on at a certain temp, The temp sending unit may be bad, After you flush radiator take a look at the unit, Also make sure fains are working use a jumper wire from battery, hope this helps.

Answer 5

In motion going down the street the fan cuts off,when stopping at a light and it starts heating up the fan kicks in,yheh the fan motors sound shot.Try hooking it directaly to the battery see if it turns on,if not thats the prob.