Why do I have very large temp variations in my Truet49Comertial refrigerator. and is the fans suppose to run continousley.

this could be a bad temp sensor or lack of proper air flow. Make sure the evap fan runs when it's supposed to be running. Also make sure the evap is not freezing up. all these items can cause what you are describing.

As per the lights that come on when you have your key turned to the ON position but the car is NOT running, the only ones that disappear after about ten seconds are the ones that show your airbag, your security light, your change oil light, and the temp for your cooling system.

As per the relay switch for the radiator fans, this is controlled by a sensor that is mounted to the radiator close to the bottom on the back side. These sensors can go faulty and can compromise the temp variance which, by normal standards, should be between 185*-200*F. I use these numbers because the thermostat that is in-lined is supposed to open up around 180-190*F. The temperature may variate 5-10* depending on which brand name sensor is installed onto the radiator.

Hope this helps.

it suppose to run so long the compressor is running it goes into defrost every 8 or 10 hours or it shuts off if it reaches temp but if you can hear the compressor running and the evap fan aint running somethings definitly wrong

The fan must run otherwise the temp. cant be correctly distributed. If temp. is correct, leave alone. If temp. to cold, turn it down untill correct. Fan will very possibly switch off then.

Most evaporator fans run all the time. This is mainly to use the air flow to assist in melting off any frost build up during the compressor off cycle. If that fan shut off with the compressor the coil will have a tendency to freeze up. :)

make sure electric coolant fan is running.if not check or replace fan relay.the coolant fan has to be running to cool down refrigerant in condensor.so refrigerant in condensor is cooled back down to high pressure liquid so it can go to evaporator.see ifcoolant fan not working.the AC is not going to cool.when you driving the condensor is cooling down from moving air when car is going.when you come to a stop.cooling fan suppose to be on so condensor gased can be cooled down.

your refrig will have "normal" off cycles for when the temp control is satisified and when it goes into defrost cycle. normal run time for most units is 60-80%. main thing though is that your temps are normal. thx peyton

check if fan in freezer is running , stryo is air diverter leave alone. ck frz temp rkm

actually, freezer fan has to come on otherwise how is the fridge supposed to cool.(fridge draws off from the freezer compartment). check if there is power to the fan. if freezer is nice and cold and fan does not run(assuming there is no power to the fan at that time, then you would need to check your freezer thermistors after that, your board. all this is assuming you dont have a blockage or shortage of gas in the sustem.