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Radiator fan

Tiny
SLUG2FACE
  • MEMBER
  • 2 POSTS
Where is the bleeder and the temp sensor located? Thanx I feel better that. U guys are helping me.
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
BRUCE HUNT
  • MECHANIC
  • 3,753 POSTS
Follow the big radiator hoses and you will find a little nipple that takes I think an 8mm wrench. If the fan runs one of these sensors shown is possibly bad. I wouldn't just rush out and replace them. Bleed the system first and then if you have and know how to work an ohm meter I can tell you how to test the sensors.


https://www.2carpros.com/forum/automotive_pictures/10316_95_1.jpg

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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
MILLARDPRATT
  • MEMBER
  • 3 POSTS
  • 1993 HONDA CIVIC
Engine Cooling problem
1993 Honda Civic 4 cyl Front Wheel Drive Automatic

1993 Honda Civic DX
Radiator cooling Fan will not come on, replaced
everythng possible including radiator. Straight
wired from the fan to the cooling fan switch
in the breaker box and the fan comes on.
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the coolant temperature sensor or the engine temperature guage sender/switch to include the fan relay-
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
MILLARDPRATT
  • MEMBER
  • 3 POSTS
Already reaplaced the cooland temperature
sensor too
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the engine temperature gauge sending unit on cylinder head near water outlet cover-if its okay could be the computer that's causing it-
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
QBLUE2
  • MEMBER
  • 1 POST
  • 1994 HONDA CIVIC
Engine Cooling problem
1994 Honda Civic 4 cyl Front Wheel Drive

If the fan for the radiator is not turning on, is there a way to tell if it's the fan or just the relay?
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
You can put power and ground straight to the fan motor, if it turns on, the fan motor is fine.

You may also jump the fan switch at the thermostat housing. If the fan comes on, you verified everything in the system is operating properly, except the fan switch.
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
OCHICABEBEO
  • MEMBER
  • 1 POST
  • 1994 HONDA CIVIC
  • 4 CYL
  • FWD
  • MANUAL
  • 160,000 MILES
What could be the problem? We purchased the car used and realized that when the fan came on there was a grinding sound, then the grinding didn't come back for about a week. I am not sure if the fan is coming on at all. Now the car is overheating after only 5-10 minutes on the road. We checked the coolant, and put some in, but it is still overheating excessively (all the way to the red).
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi OchicabebeO,

When the temperature goes up, you should check if the radiator fans are working.

Turn AC on and if fans don't work, you need to test notor and replace if necessary. The noise is normally from a failing fan motor and could have failed already.
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
JONZER514
  • MEMBER
  • 1 POST
  • 1995 HONDA CIVIC
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 160,000 MILES
My radiator cooling fan will not start, but will turn on if jumped.

It's a pretty new radiator, new hoses, new thermostat, and I just replaced the Relay hoping that would fix the problem.

Another thing I noticed, while the car is over heating, the top hose will be hot, but the bottom hose stays cool.

My car has over heated many times and more than likely the head gasket is ruined, but I'm not sure how else to check (my oil looks clean.)

Any thoughts or ideas on what to check now? And you should know. I really don't know anything about cars!
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Cooling fan not coming on could be either a defective coolant temperature sensor or the engine temperature gauge switch to include the computer.

Overheating: Could be a radiator clogged-up, defective water pump and air in the system if all okay get it block and pressure tested to rule out a blown headgasket cracked head or block
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
GLENNGRAMMER
  • MEMBER
  • 1 POST
  • 1995 HONDA CIVIC
Air Conditioning problem
1995 Honda Civic 4 cyl Manual

I have a 1995 Honda Civic 5 speed 4 cylinder, The radiator fan, conditioning fan, a/c compressor won't come on. Do you have a suggestions?
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi GlennGrammer,

Being a manual version, the radiator fan would only work when the fan switch is activated as the coolant reaches operating temperature. Test the fan relay for power supply to fan motor and test if motor is ok.

If Ac compressor is not working, the condenser fan would not come on.
You need to check if there is enough freon in the system.
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Friday, August 9th, 2019 AT 5:49 PM (Merged)
Tiny
REDENIGMATIC
  • MEMBER
  • 1 POST
  • 1991 HONDA CIVIC
I have a 91 Honda Civic si hatchback 1.6L. It has 270,000 miles with 30,000 on a rebuilt engine.

My radiator fans are not coming on. I believe this is what is responsible for the crack that is now on the upper plastic part of the radiator. I have runs wires from the fans to the battery and they come on fine. I have attached a jumper wire to the thermo switch going into the radiator and the fans still failed to come on when the car was turned on. The fans come on when I turn on the air conditioner.

Could the problem be another thermo switch or one of the relays?

Thanks for your help
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Friday, August 9th, 2019 AT 5:50 PM (Merged)
Tiny
BRUCE HUNT
  • MECHANIC
  • 3,753 POSTS
First of all the A/C will kick on the right fan to cool its own system. This should not turn on the engine coolant fan. There is more than one sensor for the engine coolant system. You have tested the fans as I would have suggested. Without assistance of wiring diagram one of the sensors I think is located near the radiator and the other is located next to the thermostat. I would say that one of those is not functioning properly.
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Friday, August 9th, 2019 AT 5:50 PM (Merged)
Tiny
HORVI98
  • MEMBER
  • 1 POST
  • 1998 HONDA CIVIC
Hello,

I have a Honda Civic EX 4 cyl with 200K miles. I had the radiator replaced after the old one cracked. A few weeks after that I noticed the temperature start to heat up after I was driving it for approx 1/2 hour and slowed down. When I came to a stop and popped the hood, I noticed the cooling fan wasn't running. Another time after I popped the hood when I stopped, the cooling fan ran for about 5 seconds and then cut out even though the temperature was high. It's frustrating getting it fixed because it doesn't seem to do it when the car is cold. Twice I have had it in and the fan comes on when they test it. $150 later and I still have the same problem. It's driving me nuts, what could it be?
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Friday, August 9th, 2019 AT 5:50 PM (Merged)
Tiny
LSUSSEL
  • MECHANIC
  • 252 POSTS
Sounds like a short in the wiring.
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Friday, August 9th, 2019 AT 5:50 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Try a new fan temp switch.
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Friday, August 9th, 2019 AT 5:50 PM (Merged)
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Hi guys! Just want to add something
Two components control the fan:
The thermal switch jack had mentioned and the fan relay.
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Friday, August 9th, 2019 AT 5:50 PM (Merged)

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