Panoply

Hello everyone,
I noticed that my condenser and radiator fan were not turning on. i replaced the condenser fan with a known good fan and i am still having the problem. i was thinking it could possibly be the condenser fan relay since my fuses look good and i have power to the connector? if the condenser fan relay goes bad, does this also prevent the radiator fan from turning on as well? will a relay from a civic connect and work the same on an integra?

TheAsian

Knowing the year would help.

Panoply

94 integra rs

TheAsian

Ok check fuse 35 and 33 under the hood, use a test light or take them out and look them over really good. Then check fuse 13 under the dash.

Next chech the radiator fan relay in the under hood fuse box. Test it.

I would deff check fuse 13 under the dash though. Its the only fuse that shares power for both fans

Panoply

thank you, sir. i will give that a try this afternoon.

HondaPartsHero

Do they run with the A/C on?

TheAsian

In rare instances the Fan switch wont operate the fans but the ecu will trigger both fans to operate.

Panoply

no, they will not come on with the ac on. im about to check those fuses now.

Panoply

i checked the #13 fuse and it was good. tried to look at the under hood fuse box to find #35 & 33 but they are not numbered from what i can see? the fan fuse under the hood was good, but i don't see any other fuses related to fans.

Panoply

i was able to jump the thermostat housing sensor and got both fans to turn on. still confused on what fuses im missing (#33/#35)?

Panoply

bump. please help.

TheAsian

Fuse #35 and #33 are the condenser fan and cooling fan. Since you jumper the fan switch and the fan operates i would say you have a fouled switch.

The way the circuit works is your fan switch is the control side of the cooling fan relay. The cooling fan switch is open until it hits a certain temperature then it closes completing the circuit for the control side of the relay. The fan switch is know as a switch to ground.

When the relay is energized the controled side sends power to the cooling fan to operate.

You have a dead cooling fan switch. Replace the switch and the system should work fine

Panoply

i replaced the ect switch with a good one and verified that both fans run when engine gets to temp, however, neither fan turns on when ac is switched to on.

TheAsian

Thats really weird. Ive even looked through all my trouble shooting and symptom diagnostic. Looking at the etms the only thing that looks to make sense is the a/c diode or a ecm failure. I would test the a/c diode first. First question is do you have a volt ohm meter that can test diodes.

Its location is above the right kick panel right above the ecu. Pull it out.

The diode is designed to pass voltage in one direction while block voltage from traveling in the opposite direction.

Check for current flow in both directions between terminals A and B. Then Terminals B and C Their should only be current flow going one direction.

When looking from the back of the diode with the tab facing up Terminal A is the far left terminal and C is the far right. B is the middle.