Sounds like your equipment needs a professional service. The cost of the service will be saved on your utility bill.

When I start my furnace, the blower start automatically and doesn't turn on until I turn the switch off on the front of the furnace.

Is the on supposed to be a off in the sentence above?

Look for the disc that has this range on it. CLOSE 110° OPEN 90° Look in the box that is on the front of the furnace behind the furnace door. Inside the box will be a transformer and some relays. You will find two disc's that will look like what you ordered According to what I can tell the disc on t...

I hate to say this but by the time you figure the cost of the motor then having someone replace it you are getting close to the price of a new unit. The new unit will also have a warrenty where the old one will not.

Here is the part

7975-3281 Fan Switch

Here is where to order

http://www.mobilehomerepair.com/ColemanGas.html

left side half way down page.

Go electric if you can then no problem with the listing for MH. Make sure your electric panel will handle the load.

If you follow the pilot aluminum gas tube you will see where it goes into the piloy itself. In the area where it connects to the pilot lite there is a orifice sized for the type of gas you use. natural or propane. The orifice has a very small hole in it to allow a small amount of gas to flow to the ...

The heat element is not supposed to be on unless the thermostat is calling for heat.

Sounds like you may have a defective sequencer. Does the furnace blow when you put the blower on manual if you have a manual switch?

It is real simple. Our homes have very small ducts. The blowers in the furnace run at a very high static pressure. The higher the static pressure the more labor on the fan motor and the heat exchanger in the furnace. The blower is supposed to remove so many BTUs of heat from the heat exchanger. When...

You may have a restricted pilot orifice which is being snuffed out when the burner shuts off. Clean the orifice first and make sure the t couple is in the flame at least 3/4 inch.

Your blower motor is OK if you can put your hand on it for awhile. The air from the furnace blower has to pass thru the A coil in order to leave the furnace. If the A coil is dirty it will cause many problems and one of them is exactly what you have right now. The coil sometimes needs to be removed ...

Clean it up and try a new run capacitor for the motor.

Follow the directions for the new furnace and do not deviate.
Do not enclose any furnace without combustion air.

Simple just start following the voltage feed back from the elements until you find the device that is not functional and blocking current flow.

It could be closed off registers in parts of the home. They all need to be open in our types of homes. Dirty air filter Blocked cold air return A thermostat that has the heat anticipator set incorrectly. Could be a heat limit or other control that has fell out of calibration. Dirty air conditioning ...