AC/Heating unit has died in the winter.

If your Cancun lazy spa is not heating past 38 degrees Celsius (100.4 degrees Fahrenheit), there could be several reasons for this issue. Here are some troubleshooting steps you can try to resolve the problem:

1. Check Water Circulation: Ensure that the water is circulating properly in the lazy spa. Make sure the water pump is functioning correctly and there are no blockages in the water flow.
2. Water Level: Check the water level in the lazy spa. If the water level is too low, it can affect the heating process. Ensure that the water level is above the minimum level required for proper heating.
3. Heater Unit: The heater unit may be malfunctioning or not working at its full capacity. Check for any error codes or indicators on the control panel. If there are error codes, consult the user manual to determine the issue.
4. Temperature Sensor: There might be a problem with the temperature sensor. If the sensor is not accurately reading the water temperature, it could prevent the lazy spa from heating properly. You might need to replace the temperature sensor if it's faulty.
5. Electrical Connections: Ensure that all electrical connections are secure and there are no loose wires. Faulty connections can lead to heating issues.
6. Power Supply: Make sure the lazy spa is receiving the correct power supply. It should be plugged into a dedicated power outlet that can handle the load required for heating the water.
7. Ambient Temperature: Cold weather can impact the ability of the lazy spa to heat up efficiently. If the outside temperature is significantly colder than the desired water temperature, the heater might struggle to maintain higher temperatures.
8. Thermal Blanket or Cover: Use a thermal blanket or cover designed for lazy spas to help retain heat. This can prevent heat loss and assist in maintaining the desired temperature.
9. Filters and Water Quality: Clean the filters and ensure the water is well-balanced and properly treated. Poor water quality can affect the heating process.
10. Timer Settings: Check the timer settings on the control panel. Sometimes, the spa might be set to a lower temperature or a timer might be restricting the heating.
11. Reset: Try resetting the lazy spa by turning it off, waiting for a few minutes, and then turning it back on. This can sometimes resolve minor issues.

please check rear blower heating control actuator.
it appears that this controllers doesnt work from cold to hot

You may have a problem with the coolant temperature sending unit and or the fuel level sending unit or an issue with the instrument cluster.

It sounds like the over heating problem might be a blown head gasket dose the motor oil have water in it or water have oil in it .and the ac sounds like the clutch on the ac unit is bad i had the same car and it did the same thing and the belt on the ac did not brake the motor just dies

You are probably going to be at the mercy of a shop to get this fixed.
The climate control system uses an inside and outside temp sensor to decide what kind of conditioned air you need. There is a main HVAC controller called a Remote Climate Control Module and the engine and body computers also play a role in the process. Then you have blend doors that are controlled electrically that open and close allowing air to pass thru the heater and ac boxes.
All of these components and circuits may need to be tested to find the problem. And yes the dash could need to be removed to access some of those components.
As long as the shop guarantees the repair will fix the problem, you should be safe. A dealer will have the most to lose if you blast them in public for not fixing it. A small garage, not so much.

Sounds like a flow flap or vacuum control head issue. The system uses 1 blower motor and one fan resistor. Both systems are intergrated to produce a BLENDED temperature. This means that to raise A/C temps originating at say 20 degrees to come out of the ducts at 45 degrees for cooling you need airflow through the heater core WHILE the A/C is on.
This is done with a blender flap. Hot air that is potentially matching the water thermostat (165 degrees) is expelled to blend with the 20 degree air to raise the discharge temperature to 45 degrees and up.
In winter, the A/C is engaged by design to keep the compressor lubed with oil. Usually this happens in Defroster mode, but through either Design or defect, may occur in heat position.
Now some of the Digital Climate control units have a Diagnostic sequence you can activate with certain button pushing combinations. Research Your Model, Year and then Climate Control Diagnostics on the internet. The sequence is something Dealers know about.
This Diagnostics would identify a malfunctioning Flap valve actuator.
I recommend people to visit a Salvage yard which allows you to dismantle a car yourself and see how the car is built.
Hope this helps and makes sense to you.

The heater/AC control is fairly complex. AC is used to defrost windows even in the winter, so not unusual to have it on. Is this a climate control system with temperature sensors or just manually controlled from dials on the heater control? Could be just the heater control is bad. If a climate control system, then we need to look at all of the sensors first.

You did not say if this is a standard htr/ac or automatic temp control. Sounds like the temperature motor is failing ( automatic Temp Control) You can get to this through the glove compartment, though it is hard. The motor sits on top the plenum (4 8mm screws). remove and replace. You will need to break the case to remove one of the screws. It will not hurt anything just be sure to break small pieces ,just enough to remove the screws.

the a/c engages when defrost or perhaps bi-level is selected to keep seals in the a/c system from drying out.people don't normally operate their a/c in the winter. this operatin is normal. there might be a reference in your manual in the heating and cooling opertion instruction

there should be a dial to control the center vents. i believe its in between the vents or just below it. it should have blue and red marks on it. move the dial towards the blue indicator and the air should now be cool. in cold weather, move this dial towards the red indicators for warm air. you can adjust temp at these vents by moving the dial between red & blue.