Cooling Fans Don't Stay On
04-05-2015, 05:32 AM
#1
Cooling Fans Don't Stay On
The car is a 94 Accord EX F22B1. Both cooling fans work as they should, but when the motor is turned off, the fans to not run for a few minutes when the motor is hot. Last year they did. I know it is possible that it could be a bad timer, but I am also wondering which sensor controls this?
04-05-2015, 06:00 AM
#2
Re: Cooling Fans Don't Stay On
Thermo B....it is the one on the upper hose where it connects to the head.
Almost like testing "A" - Key off, remove the connector and use a "jumper wire" into the wire side of the connector and ONE fan should run.
Almost like testing "A" - Key off, remove the connector and use a "jumper wire" into the wire side of the connector and ONE fan should run.
04-06-2015, 03:06 AM
#3
Re: Cooling Fans Don't Stay On
And I need to add that Thermo B is closed at ~223F. If the fan runs, you would need to test "B" by placing it in water (something) and heat it to ~223F and then test continuity.
04-06-2015, 05:29 AM
#4
Re: Cooling Fans Don't Stay On
So I jumpered the switches yesterday and the fans work as they should. The rear (A) on the water inlet housing beside the thermostat switches the passenger side fan on when jumpered with the ignition on. The switch on the front water outlet (B) switches the fans on when the ignition is first switched on, then turned off. The fans only come on when the ignition is actually off. By this I suppose the timer is OK. So not I will try another switch (B).
04-06-2015, 01:58 PM
#5
Re: Cooling Fans Don't Stay On
I'm confused by your last post.
When the Key is On/Pos II and "A" is jumped BOTH fans should run. "A" is on the housing where lower rad hose and connects to the engine between the head and the firewall.
When the Key is Off (out of the switch) and "B" is jumped ONE fan should run. "B" is on the housing where the upper hose connects to the engine - between the head and the front of the car.
I'm sure the confusion is on my part....good luck.
When the Key is On/Pos II and "A" is jumped BOTH fans should run. "A" is on the housing where lower rad hose and connects to the engine between the head and the firewall.
When the Key is Off (out of the switch) and "B" is jumped ONE fan should run. "B" is on the housing where the upper hose connects to the engine - between the head and the front of the car.
I'm sure the confusion is on my part....good luck.
04-06-2015, 03:41 PM
#6
Honda-Tech Member
Join Date: Oct 2008
Location: san antonio, texas, usa
Posts: 299
Likes: 0
Received 0 Likes
on
0 Posts
Re: Cooling Fans Don't Stay On
OP is correct, one fan with key on and timer when key is turned off. Two fans is with ac on and the second fan turns both on with the ac on.
04-06-2015, 05:38 PM
#7
Trending Topics
04-06-2015, 05:44 PM
#8
Honda-Tech Member
Join Date: Oct 2008
Location: san antonio, texas, usa
Posts: 299
Likes: 0
Received 0 Likes
on
0 Posts
Re: Cooling Fans Don't Stay On
The A/C switch through relays and diode's turn both fans on and if no ac is on only the cooling fan comes on and in the op's test only one fan comes on the cooling fan.
04-06-2015, 05:50 PM
#10
Re: Cooling Fans Don't Stay On
Lost Again is correct.
With the ignition to ON or START, if the coolant temperature is above 199 degrees F at engine coolant temperature switch A (located on the thermostat housing – connected to the lower radiator hose), then the switch will close, which should turn on both cooling fans (radiator fan and A/C condenser fan).
With the car running, if the A/C is turned on, both cooling fans should run, regardless of the coolant temperature at the Switch A.
When you shut off the car and the coolant temperature is above 223 degrees F at the engine coolant temperature switch B (located on the housing connected to the upper radiator hose ), the radiator fan will run until the temperature drops at Switch B (which opens the switch) or up to ~ 15 minutes.
Both Switch A and B are normally open type of switches, and close when the coolant temperature is above the respective temperatures.
With the ignition to ON or START, if the coolant temperature is above 199 degrees F at engine coolant temperature switch A (located on the thermostat housing – connected to the lower radiator hose), then the switch will close, which should turn on both cooling fans (radiator fan and A/C condenser fan).
With the car running, if the A/C is turned on, both cooling fans should run, regardless of the coolant temperature at the Switch A.
When you shut off the car and the coolant temperature is above 223 degrees F at the engine coolant temperature switch B (located on the housing connected to the upper radiator hose ), the radiator fan will run until the temperature drops at Switch B (which opens the switch) or up to ~ 15 minutes.
Both Switch A and B are normally open type of switches, and close when the coolant temperature is above the respective temperatures.
04-06-2015, 05:56 PM
#12
Re: Cooling Fans Don't Stay On
If you were to disconnect the 2P connector to the coolant temperature Switch A, and jump the connector with a piece of wire or small paper clip, then turn ignition to ON (II); both fans should run.
04-06-2015, 05:59 PM
#13
04-07-2015, 06:21 AM
#15
Re: Cooling Fans Don't Stay On
I'm confused by your last post.
When the Key is On/Pos II and "A" is jumped BOTH fans should run. "A" is on the housing where lower rad hose and connects to the engine between the head and the firewall.
When the Key is Off (out of the switch) and "B" is jumped ONE fan should run. "B" is on the housing where the upper hose connects to the engine - between the head and the front of the car.
I'm sure the confusion is on my part....good luck.
When the Key is On/Pos II and "A" is jumped BOTH fans should run. "A" is on the housing where lower rad hose and connects to the engine between the head and the firewall.
When the Key is Off (out of the switch) and "B" is jumped ONE fan should run. "B" is on the housing where the upper hose connects to the engine - between the head and the front of the car.
I'm sure the confusion is on my part....good luck.
It is exactly like you described it. No confusion on your part.
04-07-2015, 04:54 PM
#16
Re: Cooling Fans Don't Stay On
Just wanted to be sure 
Missed all of the other posts untill now but I see others took care of that....thanks guys.
Again, since thermo B will only run the ONE fan when the engine is off and above ~223F.....It might be the "dead" of summer and after a long run of the car before "B" ever kicks the fan on. Example, if it was running in "April" when the car was shut off......I'd would have been worried the coolant was low. Not running this time of the year in NA (north america) would be normal IMO.
Missed all of the other posts untill now but I see others took care of that....thanks guys.
Again, since thermo B will only run the ONE fan when the engine is off and above ~223F.....It might be the "dead" of summer and after a long run of the car before "B" ever kicks the fan on. Example, if it was running in "April" when the car was shut off......I'd would have been worried the coolant was low. Not running this time of the year in NA (north america) would be normal IMO.
Thread
Thread Starter
Forum
Replies
Last Post
bernard_s3
Honda Civic / Del Sol (1992 - 2000)
2
03-11-2011 04:45 AM
oneEg1Tc
Honda Civic / Del Sol (1992 - 2000)
9
07-22-2009 09:15 PM
cnydelSolHybrid
Honda Civic / Del Sol (1992 - 2000)
2
05-09-2003 02:17 PM