Question about Dometic Rooftop RV Air Conditioner

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Fan does not start

If i spin the fan and then swith on, fan will run normally but will not start on its own. Is there a relay for the fan to start. Or do i have to replace the capacitor

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  • Anonymous Mar 31, 2014

    We have replaced the Start Capacitor but now the condensor will come on for a few seconds then go off and the fan will quit running and just hum.

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  • Master
  • 828 Answers

Generally it is the capacitor that is the cause. There is no starting relay for the fan motor.

Posted on Jun 20, 2008

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1 Answer

Car runs hot when idling


Make sure the electric cooling fan(s) for the radiator are working.
TEST- anytime the air conditioning compressor kicks in, so should the cooling fans. Locate the a/c compressor on the engine, it's belt driven. Start the car and with the engine running observe the face of the belt pully on the compressor while an assistant turns on the a/c in the car (defrost feature on your heater control will also cycle on the compressor). You'll be looking to see that the front of the compressor pully starts spinning when the a/c or defrost is engaged. When that pully starts spinning the radiator fans are supposed turn on at the same time. If you see the compressor engage but the fan doesn't you have a blown cooing fan fuse, bad fan motor or a bad fan motor relay. If there is something wrong that your compressor isn't engaging in a/c or defrost and the fuses are ok, you're going to have to check the fan motor and relay by different means. You can disconnect the wiring plug to the fan motor. This is where you see if you can spin the fan blades by hand. It should spin very easily. If it is hard to spin or is siezed up, you found the problem. If the blades spin easily- direct jump current to the fan motor off the battery. If the fan doesn't work, replace it. If the fan works, check the relay. Locate the fan relay and look for another relay in the panel that is EXACTLY like it. WE WANT- another relay that is exactly the same BUT NOT critical for engine or a/c operation. We also want to know that whatever feature this candidate relay supplies power to is verified as functional. Swap the relays. If the fan still doesn't engage, check the function that you borrowed the relay from and verify THAT works with your original a/c relay in it. If you lost that function, try the proceedure with a 3rd relay if possible. Again check and recheck functions you borrowed the relay from. If you still get nothing, put the relays back to original placement. If you still are getting nothing from the fan and the other 2 functions, then the panel is toasting relays and you need either run the problem down or get the car into a professional. Now- if the fan won't engage but the other functions that you borrowed relay(s) from are still operational, we're going to give the relays a passing grade and it would seem you've got an electrical issue that, again, you need to run down or defer your efforts to a professional. Good luck on your endeavor.

Mar 16, 2014 | 2002 Oldsmobile Silhouette

2 Answers

Air conditioning


please follow this steps and fix it.
A fan failure, or a failure of the fan relay or control circuit is bad news because it can allow the engine to overheat.
Five things may prevent an electric cooling fan from coming on:
  • Defective temperature switch or coolant sensor
  • Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan)
  • Failed fan relay
  • A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)
  • Bad fan motor
ELECTRIC COOLING FAN QUICK CHECKS.
One way to quick check the fan circuit is to start the engine and turn on the A/C to max. If the fan runs, the fan motor, relay, fuse and wiring are all okay. But this test doesn't show if the temperature switch or temperature sensor and PCM are energizing the fan when coolant temperatures are high.
To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective. Resistance checks should then be made on the temperature sensor or switch, and a voltage check on both sides of the relay (you will probably need a wiring diagram of the fan cooling circuit on your vehicle to identify the relay terminals and wiring connections).
The fan motor itself can be checked by using jumper wires. Unplug the wiring connector on the fan, and use the jumper wires from the battery to route power directly to the fan. If the fan motor is good, the fan should spin at normal speed when supplied with 12 volts. Noisy bearings or a slower than normal speed would indicate a worn motor.

Jun 11, 2013 | Cars & Trucks

1 Answer

Radiator fan wont kick on


Your vehicle is equiped with a fan swith relay fuse, it almost look slike a hazard fuse. When the fan wont kick on the temperature sensor isnt letting the fan relay know it needs to kick on. Rreplace the fan switch relay its the least expensive place to start. I had this problem on my 2003 Taurus.

Jul 08, 2012 | 2006 Chrysler PT Cruiser

2 Answers

Radiator fans blows fuse fans manualy spin free


thats normal,,, the motor is likley to have a shorted coial in it, if sit will pull far more amp's that is should and it blows the fuses, dont try fitting a biger fuse in,,,,,,you will just start a fire in the car!

Oct 22, 2009 | 1993 Dodge Intrepid

2 Answers

The fan is constantly running, is this normal?


the fan on the trailblazer is attached to the water pump which is always spinning so yes the radiator fan always is running,,its mechanical,not electrical fan

Oct 19, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

2003 Pontiac Grand Prix SE 6 Cyl - Cooling Fan Not Operating


the fan motor could just be bad, you can test this by removing the fan and connecting a wire to each terminal and to a battery. the wires hooked up one way will spin the fan and the other way will spin the fan backwards so you cant hook it up wrong. I hope that helps you out!

Jul 17, 2009 | 2000 Pontiac Grand Prix

1 Answer

Fan turning on and off , not sure about compressor


its the compressor relay thats clicking[its a little unit connected to compressor with at least two wires]it could be that its [relay]going bad or the compressor could be failing,but it dose cool once it gets started so thats a good sign.the relay has two parts.one an over load,thats like a curcit breaker,it cuts power to compressor if its drawing to much amparage.the other part is a swith that goes fro start winding to run winding.as a repairman i would pull relay and use volt meter to check winds before replacing relay.its been alittle while but depending on age of refer,start winding around 2.7+-.5run winding 1.1 +- .5 new box use less energy so lower resistance older higher.hope that gives you a start ps fan goes off on because its starts with compressor.God bless ,tom

Jan 06, 2009 | Roper RT18DKXKQ / RT18DKXKT Top Freezer...

2 Answers

1994 2.2L toyota camry radiator fans do not work


Hi.....

The Normal Temperature Range to the Fan Start is: A/C ON 181 F.
A/C OFF 199 F. When the Engine Reach this Temperature the Fan should start.

OK. Do this simple test.
1---- Start the engine, Desconnect the ECT Switch located on the Radiator,
See if the Fan come ON. If yes, if not go to step #2
Connect the ECT SWITCH and leave the car Running and with a Temperature gage.
See the temperature, if the Temperature go more than 199 F.
Turn the Engine OFF.
Disconnect the ECT sensor and check for Ground at the WHITE/BLACK wire.
If ground exist, Replace the ECT switch.
But if not. Check the wire for any damaged, and the ground at the Front Left Fender.
Repair as need.

2---- check the Fuse link RDI FAN . 30 amp.
Check the Fuse link CDS FAN 30 amp.
Replace if need.
And Return to step # 1.
Check the Radiator fan Relay, Rad fan relay 2 and 3. Replace if need.

Ok. I hope this help on your question.
I can give to you the WIRING DIAGRAM of the Fans, But I need a E-MAIL adress to do that.

Thank you for use fixya....

Sep 25, 2008 | 1994 Toyota Camry

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