Question about Dometic Heating & Cooling

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I have a dometic roof top ac model: 620426.331. Fan is working. Unit will not cool. Cannot download manual. What do I need to do next?

Model 620426.331. Will not cool. Fan is running. I have cleaned under the shroud. All wires are connected. What am I not doing?

Posted by Henry McCary on

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william simpson

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  • Dometic Master
  • 1,363 Answers

Capacitors, thermostat or communication cable.

Posted on Aug 16, 2015

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5 Related Answers

Anonymous

  • 540 Answers

SOURCE: Dometic Blizzard 1300 roof top unit blowing fuses

YES< this is a "direct ground and either the motor or compresso is grounded--(DEAD)!and needs to be replaced.

Posted on Sep 09, 2008

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Anonymous

  • 68 Answers

SOURCE: need to know how many amps the model # 57915.741 draws

Compressor amp draw is 7-8 amps

Posted on Mar 19, 2009

Anonymous

  • 1 Answer

SOURCE: Older Penguin roof shroud, new style fit?

I just replaced my two 620315.321 shrouds with the newer style without any problems. I went to the Camping World site (and called them) with model no. and they knew what to send me. I also found that they had the best price at $79.00 (member price) with free shipping.

I didnt check your shroud part no.s, but think you will be ok if you do as I did.

If you have any question about installing, you can email me at [email protected]

Posted on May 05, 2009

Bill Long

  • 606 Answers

SOURCE: RV air conditioner. Compressor running, fan stops before cool

The fan motor is getting hot and going off on the internal overload in the motor.
This is caused by either a low voltage, a bad capacitor, or tight or dry bearings in the motor.
To check the bearings turn the power off to the unit, then spin the fan blade if it spins freely then the bearings are ok.
To check the capacitor you will need some kind of tester or you can buy a capacitor and replace it, that's what a lot of people do. They usually don't cost very much.
To check the voltage you will need a voltmeter and measure the volts at the unit.

Posted on Jun 09, 2009

Anonymous

  • 127 Answers

SOURCE: Coleman roof top rv air no cool,warm compressor

No Cooling.
Turn the selector switch to “Cool” and the
thermostat to a low temperature (below room temperature).
The fan runs OK, but the unit does not cool. When the unit
housing is removed, we observe that the compressor does not
run; however, it periodically hums for 15 to 30 seconds.

Possible Causes- Check all of this before buying a new unit, that may not be the solution.

“The voltage could be low – ”
a) Check the voltage between #1 on the
overload switch and the “R” terminal of the
compressor while it is not humming. This
voltage must be 115 volts domestic USA
models or 240 volts export/overseas models.
No less than minus 10% is allowable.
b) Check the voltage from “C” or “R” of the
compressor while it is humming (trying to
start). The latter reading will probably be
lower, but it still must be 103.5 volts
minimum domestic USA or 216 volts
minimum export/overseas models.
If the first reading is above 103.5V domestic USA and
the second is under 103.5V domestic USA, there is
too much voltage drop in the lines - a situation which
must be corrected for the air conditioner to perform
safely and satisfactorily.
2. “A capacitor could be shorted, weak or open.”
Turn the power off.
Caution – There is always a chance that a capacitor is
holding a residual charge, so before touching a
terminal, discharge the capacitor as explained earlier
in this booklet.
Remove capacitors, visually examine them and test
them per instructions given in earlier section on
capacitor testing (See page 9).
If the capacitors test OK, replace them and carefully
reconnect the wires. Be sure the wires are connected
to the right terminals.
3. “Start relay contacts could be open – ” if so equipped.
Turn off all power, then check for continuity with
ohm meter between terminals 1 & 2.
4. “Compressor start winding could be open or
grounded.”
Check compressor windings per instructions. See the
section on the compressors (See page 8).
5. “Compressor could be mechanically stuck.”
This very rarely occurs and when it does, it is usually
after a lengthy shutdown. This should be considered
only after all the above possible causes have been
positively eliminated. To free a stuck compressor, use
your hermetic analyzer according to the
manufacturers instructions.

Posted on Jun 29, 2009

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1 Answer

Dometic roof top rv ac not cooling


sounds like it is low on freon have someone check with gage and add more if nedded.

Jul 11, 2014 | Dometic Rooftop RV Air Conditioner

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I CAN 'T GET THE COOLING FAN TO WORK BY IT'S SELF


The fan can be driven by a drive belt off of the crankshaft or it can be operated electrically. Regardless of the design used, inspect the fan blades for stress and cracks.
Electric fans are also inspected for damage and looseness. If the fan fails to turn on at the proper temperature, the problem could be the temperature sensor, the fan motor, the fan control relay, the circuit wires, or the controller. To isolate the cause of the malfunction, attempt to operate the fan by bypassing the control. On a computer-controlled system, this can be done by using a scan tool to activate the fan. If the fan operates, the problem is probably in the coolant temperature sensor.
It is also possible to check fan function by jumping the fan relay to attempt operating the fan motor. If the fan operates, the relay may be the faulty component; however, additional tests will have to be performed on the control circuit of the relay.
A jumper wire can also be used to jump battery voltage directly to the cooling fan. If the fan motor fails to operate, check for proper ground connections before faulting the motor.
To direct air flow more efficiently, many manufacturers use a shroud. Proper location of the fan within the shroud should be at lease 50 percent inside the shroud. If the fan is outside the shroud, the engine may experience overheating due to hot under-hood air being drawn by the fan instead of the cooler air. If the shroud is broken, it should be repaired or replaced. Do not drive the vehicle without the shroud installed

May 08, 2012 | 1996 Pontiac Sunfire

1 Answer

2005 Jeep Liberty overheats at idle but while in movement temp returns to normal.


Check to see if the fan on the radiator is working at idle.

Here's information on how to change the fan if needed:

Engine Cooling Fan Removal & Installation 2.4L Engine To Remove:
  1. Remove the coolant bottle and set aside.
  2. Remove the power steering reservoir and set aside.
  3. Disconnect the cooling fan connector.
  4. Remove the cooling fan mounting screws and the cooling fan.
To Install:
  1. Install the cooling fan and the mounting screws. Tighten to 50 in-lb (5.5 Nm).
  2. Connect the cooling fan connector.
  3. Install the power steering reservoir.
  4. Install the coolant bottle.
3.7L Engine To Remove:
NOTE: If the fan blade is bent, warped, cracked or damaged in any way, it must be replaced ONLY with a replacement fan blade. DO NOT attempt to repair a damaged fan blade.
NOTE: For 3.7L Heavy Duty/Max Cool/Trailer Tow cooling package, the viscous fan cannot be removed separate from the shroud. Both fan and shroud must be removed together.
  1. Disconnect battery negative cable.
  2. Using special tool #6958 spanner wrench and #8346 adapters, remove the viscous fan from the water pump.
  3. Gently lay fan into shroud.
  4. Disconnect the electrical connector for the electric fan, then disconnect connector from shroud.
  5. Remove the two fan shroud mounting bolts connecting the fan shroud to the radiator.
  6. Remove the shroud and fan from the vehicle.
To Install:
  1. Install fan shroud assembly into the vehicle. Tighten fan shroud to radiator bolts to 50 in-lb (5.5 Nm).
  2. Install shroud mounting bolts tighten bolts to 89 in-lb (10 Nm).
  3. Connect fan motor wire connector to harness connector, and attach connector to shroud.
  4. Connect negative battery cable.
  5. Start engine and check fan operation.

Aug 31, 2010 | 2005 Jeep Liberty

1 Answer

How to change a radiator


1988–91 Models
  1. Disconnect the negative battery cable.
  2. Properly drain the cooling system into a suitable container.
  3. Disconnect the fan motor and motor connector.
  4. Disconnect the upper and lower radiator hoses.
  5. Disconnect and plug the automatic transaxle cooling lines at the radiator, if equipped.
  6. Disconnect the coolant reservoir overflow hose.
  7. Remove the radiator attaching bolts and brackets.
  8. Remove the radiator with the cooling fan attached.
  9. Remove the cooling fan and shroud from the radiator. NOTE: Check all cooling system hoses for any signs of damage, leaks or deterioration and replace if necessary. To install:
  10. Attach the cooling fan and shroud to the radiator and install the assembly.
  11. Attach the radiator bolts and brackets. Tighten the radiator bracket bolts to 7 ft. lbs. (10 Nm).
  12. Connect the coolant reservoir overflow hose.
  13. Connect the automatic transaxle cooling lines to the radiator, if equipped.
  14. Connect the upper and lower radiator hoses.
  15. Connect the fan motor and thermo-switch wire connector.
  16. Refill the system with the proper type and quantity of coolant, check for leaks and bleed the cooling system.
  17. Reconnect the negative battery cable. Fig. 7: Cooling system components — 1988–91 engines 86833085.gif
1992–95 Models
  1. Disconnect the negative battery cable.
  2. Properly drain the cooling system into a suitable container.
  3. Disconnect the fan motor and motor connector.
  4. Disconnect the upper and lower radiator hoses.
  5. Disconnect and plug the automatic transaxle cooling lines at the radiator, if equipped.
  6. Disconnect the coolant reservoir overflow hose.
  7. Remove the radiator attaching bolts and brackets.
  8. Remove the radiator with the cooling fan attached.
  9. Remove the cooling fan and shroud from the radiator. NOTE: Check all cooling system hoses for any signs of damage, leaks or deterioration and replace if necessary. To install:
  10. Attach the cooling fan and shroud to the radiator and install the assembly.
  11. Attach the radiator bolts and brackets. Tighten the radiator bracket bolts to 7 ft. lbs. (10 Nm).
  12. Connect the coolant reservoir overflow hose.
  13. Connect the automatic transaxle cooling lines to the radiator, if equipped.
  14. Connect the upper and lower radiator hoses.
  15. Connect the fan motor and thermo-switch wire connector.
  16. Refill the system with the proper type and quantity of coolant, check for leaks and bleed the cooling system.
  17. Reconnect the negative battery cable. Fig. 8: Cooling system components — 1992–95 engines 86833086.gif
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Aug 27, 2010 | 1991 Honda Civic

1 Answer

How do I remove the cooling fan shroud from the top of the radiator ? I'm trying to change the cooling fan motor, and I've removed the bolt holding the fan shroud to the radiator, but I can't get the...


I would suggest replacing the cooling fan relay in the fuse compartment under the hood first. Cooling fan motors very, very rarely go bad. You will probably end up having to remove the radiator to remove the shroud. You will save yourself a lot of time and money if you replace the relay first.

Jul 07, 2010 | 1996 Chevrolet Cavalier

1 Answer

How do you replace a radiator in a dodge shadow 1993


These are the instructions for a 4 cylinder motor.

  1. Disconnect the negative (-) battery cable.

CAUTION Do NOT remove the cylinder block or the radiator draincock with the system hot and under pressure because serious burns from coolant can occur.
  1. Drain the cooling system.
  2. Remove the hose clamps and hoses from the radiator. Remove the coolant reserve system tank-to-filler neck tube.
  3. Remove the automatic transaxle hoses, if so equipped.
  4. Remove the fan and fan support assembly by disconnecting the fan motor electrical wiring.
  5. Remove the fan shroud retaining clips, located on the top and bottom of the shroud for most of the vehicles (the Dynasty has them only on the top).
  6. Lift the shroud up and out of the bottom shroud attachment clips separating the shroud from the radiator. Avoid damaging the fan.
  7. Remove the upper radiator mounting screws. Disconnect the engine block heater wire, if so equipped.
  8. Remove the air conditioning condenser attaching screws located at the top front of the radiator, if the vehicle is equipped with air conditioning.
  9. Lift the radiator free of the engine compartment.
Care should be taken to NOT damage the radiator cooling fins or water tubes during removal or installation.
To install:
  1. Slide the radiator down into position behind the radiator support.
  2. Attach the air conditioning condenser to the radiator, if so equipped, with a force of approximately 10 lbs. (44 N) to seat the radiator assembly lower rubber isolators in the mount holes provided.
  3. Tighten the radiator mounting screws to 108 inch lbs. (12 Nm).
  4. Connect the automatic transaxle hoses, if so equipped. Tighten the hose clamps to 35 inch lbs. (4 Nm).
  5. Slide the fan shroud, fan and motor down into the clips on the lower radiator flange. Install new shroud retaining clips.
  6. Install the upper and lower radiator hoses (including the coolant reserve hose).
  7. Plug the fan motor electrical connection and attach the negative (-) battery cable.
  8. Fill the cooling system with coolant (refer to Section 1 for more details).
  9. Operate the engine until it reaches normal operating temperature. Check the cooling system and automatic transaxle (if equipped) for the correct fluid levels. Also check for coolant leaks.
Here are the instruction for a 6 cylinder engine.
6-Cylinder Engines
  1. Disconnect the negative (-) battery cable.

CAUTION Do NOT remove the cylinder block or the radiator draincock with the system hot and under pressure because serious burns from coolant can occur.
  1. Drain the cooling system.
  2. Remove the hose clamps and hoses from the radiator. Remove the coolant reserve system tank to filler neck tube.



  1. Remove the automatic transaxle hoses, if so equipped.
  2. Remove the fan and fan support assembly by disconnecting the fan motor electrical wiring.
  3. Remove the fan shroud retaining clips, located on the top and bottom of the shroud for most of the vehicles (the New Yorker, Dynasty, Fifth Ave., and Imperial have them only on the top).
  4. Lift the shroud up and out of the bottom shroud attachment clips separating the shroud from the radiator. Avoid damaging the fan.
  5. Remove the upper radiator mounting screws. Disconnect the engine block heater wire, if so equipped.
  6. Remove the air conditioning condenser attaching screws located at the top front of the radiator, if the vehicle is equipped with air conditioning.
  7. Lift the radiator free of the engine compartment.
Care should be taken NOT to damage the radiator cooling fins or water tubes during removal or installation.


To install:
  1. Slide the radiator down into position behind the radiator support.
  2. Attach the air conditioning condenser to the radiator, if so equipped, with a force of approximately 10 lbs. (44 N) to seat the radiator assembly lower rubber isolators in the mount holes provided.
  3. Tighten the radiator mounting screws to 9 ft. lbs. (12 Nm).
  4. Connect the automatic transaxle hoses, if so equipped. Tighten the hose clamps to 35 inch lbs. (4 Nm).
  5. Slide the fan shroud, fan and motor down into the clips on the lower radiator flange. Install new shroud retaining clips.
  6. Install the upper and lower radiator hoses (including the coolant reserve hose).
  7. Plug the fan motor electrical connection and attach the negative (-) battery cable.
  8. Fill the cooling system with coolant (refer to Section 1 for more details).
  9. Operate the engine until it reaches normal operating temperature. Check the cooling system and automatic transaxle for the correct fluid levels. Also check for coolant leaks.
please let me know if i can assist you in any further problems you may encounter with your vehicle.
please do not forget to rate and comment about your experience with fixya today.


Dec 27, 2009 | 1993 Dodge Shadow

1 Answer

Want to replace the radiator on my 1997 ford thunderbird


Radiator Aluminum Core, Crossflow — 3.8L (Base) and 4.6L Engines
Removal
  1. Drain engine cooling system as described. Disconnect upper radiator hose (8260) and lower radiator hose (8286) and radiator overflow hose (8075) from the radiator (8005). Disconnect the transmission oil cooler inlet and outlet lines from the radiator.
  1. Remove cooling fan motor,fan blade (8600) and fan shroud (8146) assembly as described.
  1. Remove radiator upper bracket retaining bolts and remove bracket. Lift radiator from vehicle.
Installation
  1. Position the radiator into the vehicle. Install upper brackets and tighten bolts securely.
  1. Connect the transmission oil cooler lines to the transmission oil cooler fittings.
  1. Install cooling fan motor, fan blade and fan shroud assembly as described.
Engine Cooling Fan Motor, Fan Blade and Fan Shroud Assembly, Electrical Removal
  1. Disconnect (pull apart) the male-female cooling fan motor wiring connector at the side of the fan shroud (8146). Remove the male terminal connector retaining clip from the fan shroud mounting tab.
  1. Remove two fan shroud upper retaining bolts at the radiator tanks.
  1. Lift cooling fan motor/fan blade (8600)/fan shroud assembly past radiator (8005), disengaging fan shroud from two lower retaining clips.
Installation
  1. Follow removal procedure in reverse order.
  1. Tighten fan shroud retaining bolts to 5.2-7.2 Nm (46-63 lb-in).

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    8d231fe.gif HOPE THIS HELPS.

    Oct 30, 2009 | 1997 Ford Thunderbird LX

    1 Answer

    How do i replace the radiaor? on this 2005 Hyundai do i remove the intake cover, then the cooling fan, the the motor mount? what?


    Below are instructions and a diagram for removing the radiator from your Santa Fe. There's nothing involving the motor mounts. Best of luck and please post back with any questions or just to rate the solution. Greg

    1. Drain the cooling system. Remove the radiator cap to speed draining.
    2. Remove the inlet hose from the radiator.
    3. Remove the transmission oil cooler lines from the retainer clip at the bottom of the cooling fan shroud.
    4. Remove the fan shroud clip from the condenser tubes.
    5. Remove the bolt that connects the fan shroud to the condenser hold down bracket.
    6. Remove the air deflectors from the top of the radiator.
    7. Remove the cooling fan shroud bolts.
    8. Remove the coolant reservoir hose from the radiator overflow neck.
    9. Remove the radiator upper support brackets and bolts that connect to the fan shroud.
    10. Disconnect the engine cooling fan motors electrical connectors.
    11. Remove the cooling fan motors electrical harness from the fan shroud clips.
    12. Remove the cooling fan shroud.
    13. Remove the outlet hose from the radiator.
    14. Disconnect the transaxle oil cooler pipes from the radiator.
    15. Tilt the top of the radiator rearward.
    16. Remove the condenser hold down bracket from the radiator.
    17. Lift the condenser from the mounting tabs on the radiator and position the condenser aside.
    18. Remove the radiator.
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    Aug 11, 2009 | 2005 Hyundai Santa Fe

    1 Answer

    Radiator cooling fan 30 amp. fuse keep blowing


    The fan may run with jumper wires but if it''s blowing the 30 Amp Maxifuse it's needs a new or used fan motor.It's pulling too many amps.I have almost never seen a fan relay concern.Only other thing you may check is the wiring down near the fan shoud I have seen the 2 wires get loose from the conduit & melt onto exhaust manifold.Hope tHis Helps

    Apr 26, 2009 | 2002 Saturn Sl

    2 Answers

    Code 1481


    SOMETIMES THE WIRING HARNESS GET DAMAGED WHEN FAN REMOVED. GM HAS BULLETIN TO REPLACE COOLING FAN WIRING HARNESS PART# 89024920
    Harness Assembly, Engine Cooling Fan Wiring
    1. Place the cooling fan assembly on a bench.
    2. Disconnect the harness electrical connector from the cooling fan clutch.
    3. Remove the harness from the plastic guide while feeding the wires out of the slot.
    4. Before installing the new harness, wrap the affected area on the wires with electrical tape to keep the protective sleeve in place. Be sure to keep the tape approximately 25 mm (1 in) away from the connector so the wires can be fed into the slot.
    5. Feed the wires into the slot and install the harness to the plastic guide.
    6. Connect the harness electrical connector to the cooling fan clutch.
    7. Install the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.

    Nov 25, 2008 | 2003 Chevrolet TrailBlazer

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