Question about Dometic Rooftop RV Air Conditioner

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Fan running but not cooling

Was cooling just fine, then the next day, it won't cool. Fan blows but not cooling.

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This could be a number of different things, from the compressor to a blockage somewhere. Make sure your vents are open and the thermostat is set to cool, and then unless you know what you are doing, it's best to call a professional to come out and look at it.

Posted on May 27, 2010

  • Scott Miller Jul 13, 2012

    I have the same problem with mine. Is it even possible to re-charge these units?

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Posted on Jan 02, 2017

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2004 Chevy Monte Carlo 3.4 the a/c stopped blowing,then it started overheating to the red within a couple miles,replaced the thermostat,the relay switch some days it overheats sometimes it runs fine


Are the cooling fans coming on ? What relay switch did you replace ?
The BCM will request low speed cooling fan operation from the PCM under the following conditions:
?€¢
Engine coolant temperature exceeds approximately 103?°C (217?°F).


?€¢
When A/C is requested and the ambient temperature is more than 10?°C (50?°F).


?€¢
A/C refrigerant pressure exceeds 1310 kPa (190 psi).


?€¢
After the vehicle is shut off if the engine coolant temperature at key-off is more than 117?°C (243?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.


The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the PCM to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the engine wiring harness junction block. The ground path is provided at G101.
During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the FAN CONT #1 relay coil, closes the relay contacts, and supplies battery positive voltage from the FAN CONT #1 fuse through the cooling fan motor supply voltage circuit to the right cooling fan. The ground path for the right cooling fan is through the FAN CONT #2 relay and the left cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the FAN CONT #1 relay through the low speed cooling fan relay control circuit. After a 3-second delay, the PCM supplies a ground path for the FAN CONT #2 relay and the FAN CONT #3 relay through the high speed cooling fan relay control circuit. This energizes the FAN CONT #2 relay coil, closes the relay contacts, and provides a ground path for the right cooling fan. At the same time the FAN CONT #3 relay coil is energized closing the relay contacts and provides battery positive voltage from the FAN CONT #2 fuse on the cooling fan motor supply voltage circuit to the left cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
Is your vehicles check engine light lit ?
Is the

Jul 10, 2015 | Cars & Trucks

1 Answer

1985 new yorker cooling fan won't operate.


could be a bad coolant tempurature sensor if radiater cooling fan does not work, or a bad relay for fan in fuse box for the fan.. if all is ok ! disconnect fan at the connectors. on the motor side, run a wire from positive on battery, to pos itive fan motor. ground other wire to negative on battery. if the fan works its ok. good-day ! check relay and fuse for the fan first.

Feb 01, 2012 | Dodge Vehicle Parts & Accessories

1 Answer

Air conditioner works fine while driving. When stopped for a light, temperature gage goes up and fan blows hot air.


Hello: Check the radiator cooling fan. With engine running and A/C on open hood look down on the back-side of the grill, that's where the cooling fan is. It should be running, if not check the fuses, cooling fan relays/module if they are ok then you may have a cooling fan motor failure. You can use jumper cables to hot wire the fan motor to see if it runs.

Sep 14, 2011 | 2002 Saturn Sl

1 Answer

Question about a fujitsu lifebook P5010. when i power up i have a blank/black screen although i can hear the fan running constantly. the little lcd display area next to the power button works. there are...


Hi insurancedud...

Try blowing the dust out of the laptop by using compressed air in a can or an air compressor, the compressor is the pefered choice (max air pressure 90 psi).
Blow the air into the fan discharge of the laptop, (be sure not to overspeed your fan) then blow the air into the intake of the fan.
Do this a few times until you have no more dust in your laptop.
Then see if that cooled it down, if not maybe your fan is faulty and not cooling properly.
You can also put a cooling pad with fans under the laptop to help cool , they have the laptop coolers with usb power.
Please take time to rate me thumbs up

Sep 11, 2011 | Fujitsu Computers & Internet

2 Answers

While driving my 2006 torrent the ac works fine but when i come to a stop or idle it blows hot.


the condenser cooling fan(s) are not working. Usually, it will be a fuse, the relay, or a bad fan motor itself. It cools while your car is moving due to ram air flow through the condenser....

Jun 26, 2010 | 2006 Pontiac Torrent

1 Answer

No cooling, coils frosting up, defrosted with blow dryer several days ago and cooling fine again, but frost is building up rapidly again. I suspect a defrost heater, please confirm and where to order a...


The evaporator (inside) coil can ice up for the following (typical) reasons. Check the ones that you can and hire a professional refrigeration technician if you can't find the problem yourself.

1. Thermostat isn't shutting off. (Does the compressor run continuously? Can you turn the compressor off while it is running by turning the freezer temp control down (but not off)?

2. Internal fan (evaporator fan) is not blowing air. Possible causes: fan blades hitting something; debris blocking air flow; fan motor bad; no power to fan.

3. Low refrigerant (freon) charge. Need a technician for this one.

You can get thermostat or fan motor at a local appliance parts store. Try googling "appliance parts <yourzipcodey>"

If this was helpful, please select YES to the first two RATINGS questions. Good Luck!

Oct 15, 2009 | GE (PSS26MSRSS) Side by Side Refrigerator

1 Answer

No cool air. blowing warm air


is breaker for condenser tripped---has it been running before -----is fan on outdoor ubnit running?

Jul 02, 2009 | Amana Heating & Cooling

2 Answers

Thermostat ?


The Air conditioner are good only the adjustment of thermostat are the problem, select the thermostat in lower #3 you observe the thermostat will off in such time temperature reach to #3 If you full adjustment the compressor will not off.
In fan selector the compressor will autamatic off because no connection attached fan only .

Jan 05, 2008 | Kenmore 73089 Air Conditioner

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