Ask Experts Questions for FREE Help !
Ask
    chia007's Avatar
    chia007 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 20, 2011, 07:43 PM
    Why radiator fan not work at the same times when engine running
    bakerben10's Avatar
    bakerben10 Posts: 15, Reputation: 2
    New Member
    		  
    #2

    Mar 20, 2011, 07:52 PM
    It may not be needed at the time the engine is running because the engine may not be hot enough... hard to tell without the model and engine type
    cdad's Avatar
    cdad Posts: 12,700, Reputation: 1438
    Internet Research Expert
    		  
    #3

    Mar 20, 2011, 07:54 PM

    Is the fan mechanical or electric? Either way on newer cars the fan is thermostacally controlled. If its an electric fan it should come on as soon as you turn on your air conditioning. That is one way to check it.
    kitch428's Avatar
    kitch428 Posts: 1,440, Reputation: 152
    Ultra Member
    		  
    #4

    Mar 20, 2011, 08:23 PM

    Because engines are designed to run between 190 to 210* in modern day cars.
    Too cold is very inefficient and bad for emissions. Too hot is bad for the motor itself.
    That's why we rely on temperature sensors to "trigger" the fans on when needed for optimum performance.
    A/C on the other hand is heat no matter which way you look at it, so fans are needed all the time with A/C on.
    Sometimes slow, then sometimes fast. That all depends on the pressure building up inside the lines.
    Pressure sensors take care of that job.
    Cooling systems are one of the most overlooked areas under the hood but plays a VERY important role!
    Clear things up?
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #5

    Mar 21, 2011, 05:04 AM

    https://www.askmehelpdesk.com/cars-t...le-303903.html
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Honda 2000 stall check engine yellow gunk on radiator [ 0 Answers ]

2000 Honda LX, 120K, original owner, synthetic motor oil, all maintenance up to date. Oil/filter change, about 4 weeks ago. Added some coolant to the overflow tank when I changed the oil. My wife reports that the air con was intermittent in 97 degree weather, then she got a check engine light,...

97 accord temperature gauge and radiator fan won' work [ 1 Answers ]

I have a 97 accord lx 4 cyl that had a radiator crack. We replaced the radiator. Before this happened the temp gauge stopped working. The temp gauge still does not work, therefore the fan only runs when the ac is on. The condenser fan won't run unless we tap on it. Probably bad motor. We bled the...

Engine oil in Radiator [ 4 Answers ]

I have a suzuki rg 125f that once belonged to my brother. My father and I went to put it back on the road after a year of sitting in storage, the first thing that we noticed was that there was oil sitting on top of the radiator water so we took the engine apart but found no carcks in the main block...

Honda/94/civic Radiator/cooling fan no work.ideas? [ 1 Answers ]

Fan itself does work when wired directly to battery... fuses OK... relay OK... BTW is there more than 1 relay that's involved here?

Running Water sound from radiator [ 8 Answers ]

I read that "radiant" (ie. Heat radiates from hot water) systems need to be bled, or purged of air, usually radiators are bled once or twice per season, or as needed. I've never done mine, but now suspect I have to because of the symptoms explained below, and I want to do it myself. The...

View more questions Search