My cadet c202 heater is running the fan is blowing cold air but no heat, is it the thermostat or heating elements or both???or ?????

Most probable is that the thermostat is wired wrong. Supply voltage on the line side of thermostat and unit in device side. Refer it instruction for more info. Now the unit will run for a short time after reaching desired warmth, the unit will continue (fan only) to cool down heating elements.

A fan heater is a fan blowing over a bank of electrical elements, or in many cars, hot coolant water is directed through pipes in the heater assembly, in place of electric elements.
In any case, if fan is still running when heater is turned off, the source of the heat will be gone, so blowing only cold air.

How hot is the engine running in degrees f? Does the radiator fan run?
With hvac turned on, check voltage and ground at the blower motor. If good voltage and ground, suspect the blower motor is faulty.

Hello im not familiar with this model, but looking at the schematic for the models its similar to a heater blower. as you say it is heating up but only blowing cool are but the thermostat is turning off as its getting hot, the only thing i can find that would make it do this is if its blocked on the heater element, or the heater element is only half working, the device has a thermal fuse on the heating element this could also be a problem you would need to remove the try that hold the heater element ands test the heater element with a meter to see if its working if that's fine, then one of the thermal switches would be at fault. there is alot of model number for this brand but they all have the same setup. the panel for the heat looks like it only has 2 screws hold it in place, but disconnect the fuse before opening the unit. there is 2 setting on the heater elements that means there is 2 elements one top and one bottom in the case. there is also 2 thermostats on this model im looking at that are for the heater controls these would when they get to the temp required turn the elements on and off. there is also a thermal fuse that if the element gets to hot with turn it off. check these. remember dont open the unit until the power is off and disconnected from the mains supply . personally i would think the thermostat switches need replacing, these are cheap to replace the part number is on them use the same part number to get the right part ebay or heating suppliers will have these parts in stock, they wear out as they the only moving parts apart from the fan but thats working or you would not have cool air.

Is it set on summer switch which is the fan running all the time blowing cold air

Hello

Possible causes;

Incoming Water; Most manufacturers recommend that the water coming into your dishwasher be at least 120 degrees Fahrenheit. If the water is too cold, then your dishes don't clean properly. Or the dishwasher must run longer to heat up the water. Test the water temperature by running the hot water on your faucet for about 2 minutes or until it gets really hot. Place a waterproof thermometer under the water. If the water is too cold, increase the water temperature setting on your water heater.

Thermostat;The thermostat is responsible for regulating the water and drying cycle temperature. If this thermostat isn't working, the heating element at the base of the dishwasher tub may not come on. Test this element by selecting the hottest temperature setting. Run the dishwasher on the shortest cycle. Let the dishwasher run for a few minutes, and open it up. If the dishwasher water is not hot or the drying cycle isn't starting, order a new thermostat from a parts dealer since this component is difficult to fix.

Heating Element/Drying Fan; The heating element heats up the water and air. Access this element by removing the bottom rack. It looks like a long black rod. If any part of this component is broken or corroded, you must order a new one. You usually cannot fix this element. The drying fan is located in the main housing of the dishwasher, and it blows air around your dishes to dry them. Check this part by disconnecting the dishwasher from the power supply and opening up the housing. Examine the fan, and see if any dirt or debris is preventing it from moving. Clean it. If the fan won't turn at all or if the motor is burnt out, order a new fan since it's difficult to repair this part.

If your dishwasher isn't drying your dishes properly, see if you have selected a heated drying cycle. An air drying cycle doesn't completely dry your dishes. Never overload the dishwasher, as this prevents heat from circulating around your dishes, keeping them from drying properly. Plastic and Teflon

It sounds like you have a "setback thermostat" A control intended to increase efficiency by allowing the fan to run for an adjustable amount of time after the heater turns off, whether the heater is electric or part of a heat pump. If the "setback" time is too long, the element will cool off and the fan will blow cold air. Try and locate the instructions for the thermostat and see if the "fan run time after heat turn off" is adjustable and reduce it by half. Most emergency heat circuits bypass control circuits (its an emergency, you know), and require manual control.

Sometimes the fans kicks in by time ---or by heat...even if the heat cycles dont starts . Is this gas or electric,, name brand,.... model # ect...ect..

First of all, what do you mean by hot air? DO YOU REALLY MEAN ROOM TEMERATURE AIR THAT JUST DOES NOT FEEL COLD? If this is a heat pump system, we need to look at it differently than if it is a gas or oil fired heater. Next, the thermostat control that says "cont.fan auto"----- this actually means FAN switch to be in AUTOMATIC RUN or CONTINUOUS RUN mode. Leave it in auto mode and forget that it is there; this little switch confuses a lot of people. The dial that says 10-30 is centegrade temperature that translates to 50-87 degrees farenheit. In order to get air conditioned (cold) air, you must have thermostat fan switch on auto, the heat/off/cool switch on cool, and the 10-30 dial on 20 or 21 (68-70 f.) assuming the room temp is at least 72 degrees f. or higher. If you still do not get cold air, then there is a problem with the cooling circulation system which can be tripped circuit breaker to outside compressor unit, loss of freon refrigerant, bad control such as relay or reversing valve in outside unit, stuck heat sequencers or heat element relay that are giving you heat at the same time giving cold if it is a heatpump system. You will need a skilled service person to determine these problems. Goodluck, Macgivor

If the dry cycle has a problem, check these:

Heating element
Drying fan
Thermostat
Heating element Your dishwasher has an electrical heating element that helps to dry the dishes. If the element is burned out, the dishes won't dry properly, and you need to replace the element.

Drying fan Many high-priced dishwashers have a small fan that blows air or heated air into the dishwasher to speed up the drying process. If the fan is defective, you need to replace it.

Thermostat Some dishwashers have a thermostat that monitors the drying temperature. If the thermostat is defective, the heating element may not cycle on or off properly. If that's the problem, you need to replace the thermostat.