OK, my turn to chime in. When we purchased our Discovery the 4 door Norcold was cooked.
Ordered Amish cooling unit from RV cooling units. I believe it was about 1,200.00 shipped to house. Deb and I pulled Norcold and replaced cooling unit. Been working like a champ since!
Ricently noticed that when traviling the fridge would start to warm up BUT freezer was AOK. I then noticed that the two condencer fans where acting up! I pulled fridge couple days ago and found one of the two fans failed and the other fan had bearing issues but still running.
I picked up a temp. fan at Fry's Electronics.
I contacted RV cooling units and they are shipping new fans!
I did find a source for high speed high cfm fans. Will post source when i get to my paperwork.
Did not want residential fridge because we boondock at Quartzsite LTVA (we just arrived today).
Will be doing both RV and PC work so if anybody needs assistance contact me.
You need good airflow up the backside! I have been VERY happy with both cooling unit AND RV Cooling Unit dot com. Great place to deal with!
This AM i checked Norcold...fin temp is currently running 24 and food compartment 33!
Get your fans from here;
http://www.frozencpu.com/cat/l2/g36/c435/list/p1/Fans-12_Volt_Fans_by_CFM.html?id=4ZBPM5CJNeed 120CFM of larger!
The fans are 4"x4"
"if" the fan has three leads it typically as follows;
Black=Negative
Red=Positive
Blue=Motor speed sense
Typically, these fans plug into the motherboard the blue lead is a speed sense & is NOT used when using on the back of the fridge.
Both fans on the Norcold are positioned above the condenser, unable to see them easily. I used a compact mirror and flashlight to see the fans.