Help what is this?

[reddfox77]

How to post a picture. Some thing broke and I dont know what it is..I took a picture..

[4x4van]

The A/C is not "needed" for the defrosters, but does improve the performance of them. A/C is called "air conditioner" rather than "cooler" because it "conditions" the air; it "drys" it out, which speeds up the defrosting action. However, your defrosters will still work without A/C, just not quite as quickly.

[dougrainer]

darsben wrote:

Mr.Mark wrote:

ferndaleflyer wrote:
Freon has nothing to do with the defrosters----defrosters run off of the heater and the only relationship to the a/c is they both use the same blower usually--but not always.

Just curious, then why does the air-condition compressor come on when using the defroster? (on cars)

MM.

The compressor is used to dehumidify the air for defrosting both my cars and my class A gasser.
But what do I know

Autos use the compressor. A Lot of Motorhomes also, but not all. What I found curious was his statement about 2 blower motors. UNLESS you have an overhead defroster system the SAME motor operates all the dash AC systems. The Motorhomes I have worked on, the same blower motor operates the Defroster and dash system. Some motorhomes(Newmar's and some Monaco's were 2 ) had an overhead blower system separate from the dash AC/defroster system, to help blow air DOWN from the overhead. Doug

[darsben]

Mr.Mark wrote:

ferndaleflyer wrote:
Freon has nothing to do with the defrosters----defrosters run off of the heater and the only relationship to the a/c is they both use the same blower usually--but not always.

Just curious, then why does the air-condition compressor come on when using the defroster? (on cars)

MM.

The compressor is used to dehumidify the air for defrosting both my cars and my class A gasser.
But what do I know

[Mr_Mark1]

ferndaleflyer wrote:
Freon has nothing to do with the defrosters----defrosters run off of the heater and the only relationship to the a/c is they both use the same blower usually--but not always.

Just curious, then why does the air-condition compressor come on when using the defroster? (on cars)

MM.

[ferndaleflyer]

Freon has nothing to do with the defrosters----defrosters run off of the heater and the only relationship to the a/c is they both use the same blower usually--but not always.

[dougrainer]

Twomed wrote:
Probably a switch cut in by the coach builder to cut off the compressor when heavy load (hill climbing). Helps keep your cooling system from overheating because a/c takes a lot of power.

The answer to leak is that it is under pressure whether turned on or not.

As mentioned above a good a/c shop can replace the switch for you. Be sure they are capable of saving the coolant (Freon or whatever is in your system) and recharge without having you pay for a full re charge, assuming it still gets cold.

This is one of those longer you wait the more it might cost things. Not crucial if you don't run the a/c, but could get expensive in a hurry if you do. 🙂 🙂

NO RV chassis(Gas or Diesel class A) has a system that cuts out the compressor under heavy engine load. The switch pictured is a Pressure switch and since it has 4 wires it does 2 things. IF the pressure drops(coolant leak) it cuts out the compressor, and it also activates the Condensor cooling fan. Doug

[wa8yxm]

reddfox77 wrote:
So what is a binary switch for?

A binary switch is one that is either OFF or ON.

A Trinary switch has ON/OFF/ON but the two on's are different

And then life gets to be fun.. I have one switch with like 120 positions..Not sure centurduodeka perhaps I do not know.

(That's a lot of positions)

[dakdave]

Most of these switchs are can be changed without discharging system as they are on a schader valve. good luck dave

[Gjac]

What year and chassis is your MH? Is the cooling system an Evans? In the upper L/H top of your picture should be a black plastic box that should tell you the system?

[ScottG]

You don't want all the freon to leak out and stay that way. The damage will eventually get much more expensive regardless of use. I would get it fixed ASAP.

[darsben]

You need the A/C for defrosters so it should be fixed

[Twomed]

Probably a switch cut in by the coach builder to cut off the compressor when heavy load (hill climbing). Helps keep your cooling system from overheating because a/c takes a lot of power.

The answer to leak is that it is under pressure whether turned on or not.

As mentioned above a good a/c shop can replace the switch for you. Be sure they are capable of saving the coolant (Freon or whatever is in your system) and recharge without having you pay for a full re charge, assuming it still gets cold.

This is one of those longer you wait the more it might cost things. Not crucial if you don't run the a/c, but could get expensive in a hurry if you do. 🙂 🙂

[reddfox77]

So what is a binary switch for?

[reddfox77]

Whats funny is I didnt even have it on.