Norcold Cooling Units and Thermostats


If your norcold rv refrigerators has stopped cooling, a failure of the evaporator can be the culprit. This will cause yellow residue to appear behind the fridge, and an ammonia smell can be present as well.

If you want to fix this problem, it is essential that you know how to replace the cooling unit. This is a task that many people are capable of performing, but it can be tricky if you don’t have the proper skills.

1. Evaporator Foam Pack

A Norcold Cooling Unit is a vital part of your RV, ensuring that you can keep foods safe and fresh. With the right parts from Boat & RV Accessories, your Norcold can be working as efficiently as possible.

The Evaporator Foam Pack is a unique design that covers the entire evaporator tube set. It is injected into a mold that is affixed to the cooling unit.

This is done to eliminate air infiltration and protect the evaporator tubing from refrigerant leaks. The foam is also injected into the tubing to help prevent heat transfer from taking place between the coils.

After a quality rebuild is completed, the coils and all tubing that goes into the foam pack are galvanized to protect them from moisture entrapment. This is a step that only quality rebuilders use, and it is a factor that can dramatically extend the life of your evaporator coils and cooling unit.

2. Thermo-Mastic

Thermal mastic is a heat transfer compound that’s applied to the evaporator coils at points where they make metal to metal contact with the freezer plate and fins of the refrigerator. It greatly enhances the cooling ability of the unit, and failure to use it will result in poor cooling.

Typically, these thermal mastics are pumpable and comprise chlorinated paraffin as the vehicle with fillers such as powdered aluminum silicate clay and calcium carbonate. They often also include a wetting agent to facilitate the dispersion of the filler in the vehicle and improve the overall mastic performance.

A low cost thermal mastic is the subject of this invention that does not degrade polyurethane foam insulation during the foaming process and provides good heat transfer between refrigeration tubing and freezer walls. The mastic of this invention is comprised of chlorinated paraffin as the vehicle, with fillers and a wetting agent in the order of one weight percent.

3. Spray Foam

Spray foam is a unique insulation and sealing product that is sprayed on site and conforms to the surface it is applied to. It creates a tight building envelope that improves energy efficiency and comfort.

It is used for both commercial and residential insulation projects. It is a more efficient and less expensive form of insulation than fiberglass or cellulose.

The R-value of closed cell spray foam varies slightly depending on the manufacturer and the thickness of the application, but it ranges between R6.5 and R7.4 per inch.

Closed cell spray foam is a type of insulation that has waterproofing abilities, and it can be applied on the exterior of a building or home. It also acts as a thermal, air and vapor barrier.

4. Tape

A lot of thought and attention has gone into the design of the Norcold 634746 System Pack cooling unit. Among its many functions, the oh-so-cool evaporator foam pack serves as the foundation for a state of the art cooling system. The evaporator is a complex assemblage of components, most of which are proprietary to Norcold. Its impressive design also features a host of industry-leading innovations that set it apart from its competitors. The resulting unit has a reputation for being one of the most reliable and economical refrigerators on the market.

In fact, Norcold has a long and distinguished history of producing a plethora of products for the recreational vehicle market. This includes the aforementioned 634746 and many more that are designed to help you make the most of your time on the road.

5. Thermostat

A thermostat is a device that monitors the temperature in your home and can switch your central heating system on or off according to the setting you set it at. There are many different types of thermostats, from traditional mechanical thermostats to more modern digital versions.

A traditional thermostat uses two pieces of metal bolted together to form what’s called a bimetallic strip, which works as a bridge in an electrical circuit connected to your heating system. As the temperature of your home increases or decreases, the strip expands and contracts so it switches the electric circuit on or off.

These thermostats are less accurate than digital ones, but they’re also more affordable. They also have more sensitive sensors that read the temperature of your rooms and control the heating to keep it within one degree of the desired set point.


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