Dash Heater Blower Doesn't Work

[PAULAMERSON29]

Hello All,

I am having trouble with the engine heater and A/C, the problem is that it doesn't seem to be working.  The blower does not blow, I have changed out the relay with no luck.  I have the old push button control assembly and can not find a replacement online.  Can anyone help as what might the problem being, I think its the switch with the blower not even turning on.  By the way I have a 86 Winnebago chieftain 27'.

Thanks Paul

[cosmic]

try the solenoid. these big fans have there own solenoid. just like a starter except they are a constant solenoid. look under the dash for it and jump it with a screw driver. this was my problem. hope it helps.
the solenoid are about 40 dollars because they are the constant type..

[bluebird]

Are you sure the blower motor is good?  GM blower motors are known to go bad. Have you checked to see if you have voltage at the blower motor? If so make sure you have a good ground to the motor housing.

[DaveVA78Chieftain]

Does yours look like this?


If so: http://www.evanstempcon.com/serviceparts2.php?pullID=RV218416

Manual: http://www.evanstempcon.com/pdf/slide_oi.pdf

Dave

[M & J]

Youre amazing Dave.

[PAULAMERSON29]

Cosmic, where would I find the solenoid at.  Under the dash is very crowded in there.

Dave, mine is older it reminds me of the old radio with the push buttons, I will get a pic and post it on here.

is there a way of troubleshooting just the blower.

Thanks
Paul

[DaveVA78Chieftain]

You have to let Google be your friend by using off the wall search phrases.  Many times it is becomes a connect the dots issue and follow the rabbit trail.   Started with Googling Winnebago Heater Control which lead to a discussion in another forum trying to ID a P30 chassis control which lead to Evans Tempcon who is actually distributing a common control that was originally designed and produced by MOPAR in the 70's and 80's.

Dave

[DaveVA78Chieftain]

Will try to locate it tomorrow.  If this is only a fan motor issue, then full voltage is applied to the fan motor on high.  For slower speeds, a resistor network would be used. 


Dave

[PAULAMERSON29]

Dave,
  Thanks, I have been looking and have not found anything on this control assembly.

[Stripe]

That looks the same as mine only with pretty colors.  Will be interested in how this plays out as I will be going to my "local" fun wreck yard for the controller among other things..

Also, give these folks a call..  They may be able to help..
http://www.winnebagoparts.com/parts-accessories.php#

Fredric

[DaveVA78Chieftain]

Jan 2017 edit:  This one is from a 81-93 Dodge Ramcharger


If memory serves, are the pushbuttons controlling vacuum lines?  Or is there a big electric switch behind them?

Dave

[DonD]

Same as the one in my '86 made Southwind Cl A

[DaveVA78Chieftain]

The panels (in many variations) were used in Dodge trucks/vans from 1970 through 1989. (http://www.ebay.com/itm/81-89-Dodge-Ramcharger-and-Dodge-D-W-Series-Truck-A-C-Heater-Control-/161023596470?pt=Vintage_Car_Truck_Parts_Accessories&hash=item257dc117b6&vxp=mtr#ht_442wt_1170)






If you determine you need it, you can just purchase the vacuum control switch (controls which system [AC or Heater] is to be used and which position the the vacuum controlled ducts are in):

However there are a several different types so you would need the P/N off of the switch to start.  Many of the versions are available new via aftermarket  suppliers (http://www.theautopartsshop.com/auto+car-usa+parts/dodge+ramcharger+a~2fc-and-heater-control-switch.html) or from pricey restorer sites (http://jimsautoparts.com/nos_truck_parts.htm)

You can also just buy the blower motor switch


however, again you will need to do a little comparison shopping to find the right parts.   Point is, it is a Dodge truck/van based design
Chrysler blower motor switches: http://scsfrigette.com/pdfs/rv/blower%20switches_vaccuum%20switches_thermostats.pdf


Other parts in this circuit are the blower motor relay (bypasses resistor block on HI fan mode)
Resistor block - used for LOW and MED fan speeds.   I am not sure what yours looks like.

Now the hard part is how is all this connected together.  Because Winnebago used the same basic circuit for many years, the best I can offer is a 1990 circuit diagram version.  The components involved are shown at the bottom of PDF page 1 on both drawings.  Yours should be very simular.

Chieftain: http://www.winnebagoind.com/diagram/1990/101420.pdf (includes AC radiator fan motor interface)
Elandan/Itasca: http://www.winnebagoind.com/diagram/1990/096310.pdf  (bare bones circuit)

http://scsfrigette.com/hvac-systems-recreational-vehicles-catalog.php  (THe company Winnebago has used for many years to support automotive Heating and AC components; http://www.winnebagoind.com/resources/service/pdfs/2005-06%20Auto%20Heating%20&%20AC.pdf)

http://www.evanstempcon.com/index.php (The company that took over support for a large portion of Chrysler designed AC/Heating components)

And finally, always remember that a lot of this stuff is available over the counter at your local autoparts house.  Trick is to ID what Chrysler product used the paticular device.

Dave

PS: Dave's circuit diagram: 

[cosmic]

mine was behind the high low headlight switch. board pulled out and there it was bolted to the steel floor.
I jumped it with a screw driver and the fan went on. this told me it was a faulty solenoid.

[Stripe]

So, you found yours, here's hoping his is in the same spot.  If his is in the same place and it's the same problem, do they still sell that solenoid?

[cosmic]

yes I was hoping his is in the same spot. They sell the solenoid at napa. all you need to ask for is a constant solenoid rather then a regular automotive style because they don't hold up very long.
It should be a 3 post solenoid.

[PAULAMERSON29]

Cosmic

  Thanks I have been gone all day and will try to locate it tomorrow and jump it.

thanks
Paul

[PAULAMERSON29]

Cosmic

  No luck with the solenoid there, pulled the board out near the dimmer switch and nothing, I will keep looking but if you know of another spot let me know as I am new to the RV thing here.

thanks
Paul

[PAULAMERSON29]

Cosmic

  I have checked the wiring diagram that dave sent me and the only solenoid that the heater is connected to is the starter solenoid.  so unless I am missing something I don't see another one.

Paul

[DonD]

Mine began intermittent no blow. A quick cycling of the ac /heat to off several times and it started working. Now nothing so I checked the fuse..OK.  Turned on the ign sw and pulled the fuse, heard a relay near or at the controls click each time I r and r'd the fuse. Kept doing that and the blower started and continues to run. Maybe some oxidation on the relay contacts? Good for now anyhow 

[jstumpf1944]

Hi Paul,
I have the same problem on my 87 Winnebago, Elandan, 31ft.
I believe my problem is the blower motor resistor, i have no power to the motor, have used jumper wire from 12v source to motor, it works.
Do not know location of resistor?
If you have any info, would be greatly appreciated!

Jim

[tiinytina]

Mine works on high only... told it was the resistor also... still have yet to find or replace it though... when you do find it let me know! P30 454 1987 as well....
Tina

[jkilbert]

At least on cars the blower motor resistor is usually close to the motor mounted in the heater housing.

[bluebird]

The resistor pac has to be in the air stream to keep from burning up. Mice can play havoc on them with their nests. They can short out the resistors as they are just a coil of wire, with the low speed being the largest. Could also be the heater motor relay. My 80 Itasca relay was under the hood on the passenger side. Was a Bosch cube relay, there may be two or three relays together. Fuel pump, air compressor, and heater motor, mine were mounted on the steel bulkhead.

[DonD]

My blower issue returned, it was a loose connection at the blower motor!