Question about 1990 Nissan 300ZX

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Why does the radiator fan comes on in the morning when i start the car and it goes off after awhile.but when the a/c is on it not coming on,.WHY?

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4 Answers

Temperature gauge

Is the fan in front of radiator working ?
is there a good fan belt running around the fan pulley.
Check the Thermostat value is not sticking in closed position. its in the engine bay on the engine .
Could also be water pump at fault.

Feb 06, 2018 | Toyota Yaris Cars & Trucks

1 Answer

Warning light on dashboard

First thing to do sounds like a simple check of the radiator fluid level.

May 28, 2012 | BMW Cars & Trucks

1 Answer

I have a 2007 Silverado, radiator fan comes on 5 seconds after starting engine.

The thermostat circuit that controls the on/off cycles of the radiator fan motor is not working properly in that its performance is, at best, erratic. But the car is not overheating which is a plus. Will not harm car and in cold weather it will take it a tad longer for the engine to reach full operating temperature.

Apr 01, 2017 | Cars & Trucks

2 Answers

Radiator fan not working and my windows are not working also. Maybe my fusible link is broken. HELP

I think the problem might with the radiator sensor switch. Check the fuses. If necessary you can replace your radiator fan at

Aug 08, 2011 | Nissan Sentra Cars & Trucks

1 Answer

I replaced my water housing and springs and o rings but it is still over heating. Can you tell me what parts do I need with a radiator fan and what fan do I need? I am confussed but I want a used one as I...

first check two hoses from radiator if same temp. start afew mint. then tach by hand if same tem. or near that means water pump and thero. valve is ok then go to electric sys. check therom. s.w on radiator remove socket connect two line with com.line to check fan ok two speed . if overheating when load this cyl.head gasket need replace. check the smal return hose goes to resovor tank if open littil coolant come out this for breathing coolant back to resovor tank . earler morning you can make sure if cyl.head gasket is ok befor start open the resvor tank cap then start check if there is bubblescomes out .

Jul 16, 2011 | 1992 Volkswagen Cabriolet

1 Answer

Overheats, thermostate replaced, water pump replace, radiator fluched and drain plug replaced. water temp light and check engine light comes on then goes on then comes back on. car starts hard

It sounds like you may have a bad cooling fan. You can test this by running a jumper wire from the fire supply line going into the cooling fan to the battery. If the fan comes on this will indicate a bad fan relay which will have to be replaced. Or, it could be bad radiator hoses can **** together and cause it to run hot. Don't rule out a blown head gasket but start by checking the easier things first.

Aug 05, 2010 | 1998 Chevrolet Malibu

2 Answers

My 1999 Cavalier overheats when you turn the defroster off. Its like the cooling fan wont kick on, and the radiator has been replaced. Could it be the computer?

mist likely you had the oil changed recently and they knocked off the wire to the sending unit that tells the fan when to come on - the fan only comes on all the time - -when the AC is on or as you state the defrost is on . I hope you have a regular mechanic as he will be a hands on friend if you ask him.

Dec 26, 2009 | 1999 Chevrolet Cavalier

1 Answer

My Cars temperatue gauge is

the rad must run as soon as AC is put on ,some cars have a pressure switch that put the rad on when the gas pressure in the ac system goes up with temperature ,cheapest way round this is to connect fan via a relay to the ac pump feed so as soon as ac is turned on fan comes on

Jun 20, 2009 | 1994 Buick Regal Gran Sport

1 Answer


you might need to get the water level sensor checked, it may be faulty

Nov 28, 2008 | 1999 BMW 318 ti

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