Fast forward a year later, working on winter camping projects I start researching a replacement fan and automatic control, the on/off switch was often forgotten and ran the entire time, not just when needed. Looking into computer fans I learned that they have two types of bearings a sleeve type and ball bearing. The sleeve types are not supposed to be mounted horizontally, for that a ball bearing type should be used as they can be mounted both ways. This is most likely why my other one failed, it was a sleeve bearing that I mounted horizontally (when in the computer it came from, it was vertical).
I purchased a new 120mm dual ball bearing fan from Amazon, $9.99 at the time.
https://www.amazon.com/Antec-TriCool...ll+bearing+fan
To active the fan when the fridge was running I also purchased a snapdisc thermal control switch 100 degree on/ 85 degree off from Amazon, $9.75 at the time.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
To gain access to the old fan I removed the vent cover on the roof exposing the screen covered base.
I used diagonal cutters to snip the screen on three sides of one half to remove the old fan.
New Fan
The new fan has a male/female quick connector to a one wire and two wire plug. The plug with the red and black wire was removed and wire spliced to the wire going to my old power/ground wire. The white wire is not used in this application and can be taped out of the way. It is for controls when used in a computer.
The fan was the same size as my old one and bolted right into my bracket, wires taped and cable tied like the old fan. I placed a bead of non-sag Dicor caulk around the screen to “glue” it back in place and replaced the top cover caulking the screws to seal out water. Work on the roof is done.
I made mounting brackets for the snapdisc switch from metal pipe hanger and bolted them to the switch.
I attached the switch to the coil with a couple hose clamps. When the fridge is running the coil will warm the switch and closes the circuit to send power to the fan. When the fridge is off and coil cools the switch opens stopping the power.
For the wiring this is what I did (image below for reference). I suggest all wiring be done with the fridge power off and the battery disconnected. Locate the 12volt power and ground. The black wire terminal (red arrow) is the 12volt power. The white wire terminal (blue arrow) is the ground. Use a screw driver to unscrew the terminal and insert the stripped end of the wires, tighten terminal. The ground terminal should be connected to the wire running up to the fan (the black wire on the fan is ground). I ran the power wire to a low amp blade fuse connecting it with spade terminals (yellow arrow). Then I went to the manual switch (this is optional, I did since I already had it there) and then to the snapdisc switch. Then the snapdisc switch is connected to power side wire of the fan (red wire on fan). Cable tie wires nicely and route out of the way of components that will get hot such as the coils and propane burner.
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Current Camper: 2006 Sunline T-264SR
Previous Camper: 1998 Coleman Mesa
Tow Vehicle: 2002 Chevrolet Avalanche 2500, 8.1L, 4X4
DirecLink Brake Controller, Draw-Tite Ultra Frame Receiver, Reese HP Trunnion Bar Hitch W/ HP DC