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Old 07-22-2019, 12:44 AM   #1
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Where is the A/C Heater fan relay location on a 2004 Ford f53?

My heater A/C fan intermittently stops and restarts once in a while. Does is regardless of which speed it,s on. I understand there is a main relay with 5 pins. Can anyone tell me where this maybe located?
I have a 2003 or 2004 34 foot National Seabreeze on a Ford F53 chassis.
Thanks,
Mike
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Old 07-22-2019, 04:48 AM   #2
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Once you remove the plastic shroud on your A/C unit, there's a metal panel on the side with 3 or 4 screws. When you remove this panel that's where all your capacitors and electrics are. I would think it's in there. To me your problem sounds like a failing capacitor.
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Old 07-22-2019, 09:54 AM   #3
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Are you talking about the chassis/dash a/c fan?


Blower relay is usually in the fuse box mounted above the radiator on an F53.
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Old 07-22-2019, 10:08 AM   #4
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Yes, chassis dash fan for A/C , Heater.
I,ll look under dash near radiator.
Thanks,
Mike
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Old 07-22-2019, 03:39 PM   #5
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Quote:
Originally Posted by mxw1 View Post
Yes, chassis dash fan for A/C , Heater.
I,ll look under dash near radiator.
Thanks,
Mike
Oh ok that helps.

Randalpho said, Blower relay is usually in the fuse box mounted above the radiator on an F53—not under the dash. You have to open the front hood to get to the black fuse box thats mounted above the radiator.
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Old 07-24-2019, 01:09 AM   #6
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Are you sure the blower is stopping or is the air being devertered to the windshield defogger vents. If it is you have a vacuum leak. Loss of vacuum causes the the system to default to the defogger vents.
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Old 07-24-2019, 05:05 AM   #7
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Mike-

You can get a copy of the manual for the Ford F-53 chassis at this link. For the 2003 F-53, the manual discusses the under-hood fuse box ("Power Distribution Box," a.k.a. the PDB) on pages 41 through 44. Page 56 shwos where the PDB is located.

There's a trick to opening the PDB. Find the hinge. If the hinge is on the left, the latch is on the right end of the BOTTOM. If the hinge is on the right, the latch is on left end of the TOP. The latch is NOT on the side opposite the hinge. Slide your finger under the latch and pull it towards the front of the vehicle. The cover will release and swing open on the hinge.

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Old 07-26-2019, 07:22 AM   #8
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Thanks everyone for your information. I have found the relay or I should say two relays. They are above thee radiator inside the font hoodalong with a bunch of fuses. One relay is labeled A/C (In the Ford manual) and the other is labeled A/C , Heater blower. I believe they are number 3 and 4. Also fuse #23. I looked at the fuse and it was good and not corroded, bought one replacement relay at auto parts store. Replaced one of the two relays, but the problem returned, swapped the new relay into the other location and it seemed to have fixed it. Drove home he rest of the way, about 300 miles and it didnít act up again.
I think that fixed it.
Thanks for your help everyone.
Mikes
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Old 07-26-2019, 04:37 PM   #9
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I have mine set to blow out the vents and it cuts out when the engine is under load, going uphill etc. Not sure if it is diverting to the defrost vents but Iím thinking my problem is a vacuum leak which I havenít been able to track down. Once I ease off the gas the vents return. This is the first Iíve read about the relays being a possible cause.
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