Question about Dometic Rooftop RV Air Conditioner

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Recreational Vehicle A/C

The thermostat keeps going on and off every 30 45 seconds. What could be the cause and is it possible easy fix?

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Check the condenser and evaporator to make sure these are clean. If the filter is not replaced or cleaned regularly the evaporator will become plugged.
If this is a roof top unit the thermostat may have a thermocouple on it that is shoved into the evaporator. Some times these go bad.

Posted on Aug 07, 2008


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Air conditioners running into a small space tend to cycle rapidly. Try to direct the airflow away from the intake so that no cold air reenters the unit. This will allow more cooling before the thermostat cycles.

Posted on Jul 15, 2007


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1 Answer

Microwave shuts off after 10 seconds

see this causes and fix it. God bless you
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If this is your microwave oven repair problem, you will need to check the operation of the fan. Below in the component testing chart, you will see how to test the fan. Also, if possible, make sure the fan is not obstructed somehow and not turning. Also check your fan relay at your control board for voltage, if no voltage, replace control board. This fan should come on at the same time any cooking starts.


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2003 Cadillac CTS at 225,000 miles Code P0128 comes up periodically. Any solution other than a thermostat change at $400 plus?

First off who ever said $400 to change a thermostat is trying to rip you off. The actual part is like $20 bucks max and its so easy to change. I can guide you through it if you would like.

The P0128 code is Coolant Thermostat Malfunction.

These are the possible causes for this code:
- Insufficient warm up time.
- Low engine coolant level.
- Leaking or stuck open thermostat.
- Malfunctioning engine coolant temperature sensor.

These are the possible quick fixes:
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1 Answer

2003 ce lancer car keeps overheating... thermo fan isnt working... coolant is going but no leak.. checked fuses all seem fine.. not sure what to do next

It should be either the thermostat or the water pump.The water pump will sometimes allow you to go about 25-30 miles before it overheats.The thermostat would likely be the cause if once the temperature guage starts going up,it kind of just keeps going and overheats.You need to avoid driving and overheating as much as possible due to very bad engine damage.Hopefully you have a second car.You can call a couple shops,they normally will give you a free opinion,just describe it with as much information as you can to get an accurate one.Also you can get free estimates unless you plan to self-repair.Good luck! Greg

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What would cause a gas furnace to keep running after the thermostat is turned off

This could be a result of a couple things. First, the furnace will automatically keep running for a short period after the thermostat shuts off because it has to blow all the hot air out of the system before it shuts off, that way, your not left with alot of heat stuck inside. Second could be the thermostat itself malfunctioning, you can pick up a cheap one at a local department store and installing them are fairly easy, especially since its mostly color coded. Some thermostats have an adjustment on them to set the unit to come on before or after the temperature reaches the desired amount. Other problems may exist, but that is the most common. Hope this helps

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1992 Eagle Talon 2.0L DOHC Overheating

If the hose to the thermostat is missing then there is no coolant in the engine ! Check the engine oil. If milky whhite, walk away as its likely the head gasket leaks or the cyl head is warped.
If coolant is present, the thermostat may be stuck closed (rare, but corrosion in the coolant over time can do this). This can cause over heating.
Thermostat & hoses are relatively easy and low cost to fix. The cylinder head gasket isn't so easy or cheap.

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2 Answers

97 Monte carlo is overheating.

If the thermostat is sticking closed you can maybe tap the housing with a hammer or other tool while it is running, it may cause it to open up and you will see the temp going down on the gauge. As I recall the thermostat is at the front, within easy reach, so you could go ahead and take the thermostat out, reassemble and see if you still have a problem. For testing it won't hurt anything to run without it, just make sure to replace it with a new one if it's bad. There's also your waterpump and possibly a fan clutch. If it has electric fan make sure they are coming on, if not maybe the fan itself or possibly relays can be bad. Please rate this. Thanks and good luck.

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