Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts  See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
heater question...cold out!!
Forum Index -> Thing/Type 181 Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
1973vwthing
Samba Member


Joined: April 21, 2006
Posts: 108

1973vwthing is offline 

PostPosted: Tue Feb 26, 2008 4:16 pm    Post subject: heater question...cold out!! Reply with quote

the bn4 gas heater in my thing turns on for about 20 seconds or so gets warm then shuts down...no fan or anyhting...if i wait about 10 minutes it will fire back up and do same thing...not blowing fuse or tripping safety switch...any siggestions?...been reading bunch of posts...thanks everyone!!...
Back to top
View user's profile Send private message Classifieds Feedback
mrafindley
Samba Member


Joined: December 29, 2007
Posts: 642
Location: miami Florida
mrafindley is offline 

PostPosted: Tue Feb 26, 2008 7:15 pm    Post subject: Reply with quote

Sounds like fan motor
_________________
73 THING
67 Beetle

http://w2.wolfsburgii.com/downloads.htm
Back to top
View user's profile Send private message AIM Address Gallery Classifieds Feedback
1973vwthing
Samba Member


Joined: April 21, 2006
Posts: 108

1973vwthing is offline 

PostPosted: Tue Feb 26, 2008 8:16 pm    Post subject: Reply with quote

think the fan motor heats up and shuts down?....after heater shuts down i can see some smoke inside the front wheel well...then goes away after a bit...the fan seems to blow fine if gas isn't hooked up and can't fire up the fuel...any more ideas...reading thru manuals...thanks again
Back to top
View user's profile Send private message Classifieds Feedback
1973vwthing
Samba Member


Joined: April 21, 2006
Posts: 108

1973vwthing is offline 

PostPosted: Tue Feb 26, 2008 8:16 pm    Post subject: Reply with quote

think the fan motor heats up and shuts down?....after heater shuts down i can see some smoke inside the front wheel well...then goes away after a bit...the fan seems to blow fine if gas isn't hooked up and can't fire up the fuel...any more ideas...reading thru manuals...thanks again
Back to top
View user's profile Send private message Classifieds Feedback
mrafindley
Samba Member


Joined: December 29, 2007
Posts: 642
Location: miami Florida
mrafindley is offline 

PostPosted: Tue Feb 26, 2008 8:22 pm    Post subject: Reply with quote

The smoke is there because the exhaust pipe for the heater is there sounds like to me the thermostat pull and push the temp knob the cotacts could be stuck
_________________
73 THING
67 Beetle

http://w2.wolfsburgii.com/downloads.htm
Back to top
View user's profile Send private message AIM Address Gallery Classifieds Feedback
1973vwthing
Samba Member


Joined: April 21, 2006
Posts: 108

1973vwthing is offline 

PostPosted: Tue Feb 26, 2008 10:10 pm    Post subject: Reply with quote

i bypassed the push pull thermostat by putting the 2 blue wires that run to it together...the heater stayed on and when i switched the power knob off the pump stopped clicking but the fan kept running for a bit(to clear exhaust gases?) then shut off on it's own....is it bad to run heater like this?....how hot should it get if thermostat is bypassed...i only ran it for 5 minutes or so....thanks again!!1
Back to top
View user's profile Send private message Classifieds Feedback
crofty
Judas of the North


Joined: August 09, 2000
Posts: 18409
Location: Land of Whine and Phonies
crofty is offline 

PostPosted: Tue Feb 26, 2008 10:41 pm    Post subject: Reply with quote

Before you start playing with a gas heater buy yourself a manual. The thing shop has them and they are worth the investment
_________________
When in doubt, logo it out!!

HamburgerBrad wrote:

I slept on crofty's tent once. I passed out drunk from two bottles of Everett's brother's wine.
Back to top
View user's profile Send private message Visit poster's website Gallery Classifieds Feedback
1973vwthing
Samba Member


Joined: April 21, 2006
Posts: 108

1973vwthing is offline 

PostPosted: Tue Feb 26, 2008 11:32 pm    Post subject: Reply with quote

have manual but doesn't discuss adjusting thermostat...i can see things in the thermostat rotating when i push and pull....since heater runs and doesn't shut off when bypassing thermostat is the thermostat the problem or could it be further down the line...also, the fan goes thru the run-on cylce with thermostat bypassed...thanks everyone!!
Back to top
View user's profile Send private message Classifieds Feedback
Ray Syverson
Samba Member


Joined: February 12, 2006
Posts: 72
Location: Lake Zurich, Illinois
Ray Syverson is offline 

PostPosted: Wed Feb 27, 2008 6:04 pm    Post subject: heater question--cold out! Reply with quote

I have a 73 Thing and have recently been reading my manual and playing with the thermostat switch.It sounds your problem may be with the thermostat switch.In the owners manual it says to pull the heat control knob out before starting the heater.In the heater manual it says to pull the knob out before checking the thermo switch.Why? Maybe in some cases the contact points are open in the switch when the heater is cold.They need to be closed for the heater to start(you closed the circuit by putting the wires together and the heater ran)By pulling the knob out before you start you cause the contacts to close if they aren't already.I've heard that the thermostat switch is trouble prone.The heater manual shows two types.The one I have mounts on the top of the hot air duct and can easily be removed with two screws after disconecting the cable.It has two stop screws that limit travel of the push-pull and also another adjustment down by the spring underneath. I would suggest you try starting the heater with the knob pulled out (blue wires back on) and see if that works. Then whether it does or not take off the thermostat switch if you can and inspect it. If its like the one I have you can blow hot air on it with a heat gun or hair drier and see the contacts open and close and you should see how to adjust it.You can clean contacts and check operation with an ohmmeter or tester lite.If you can try to get it tweaked a little so that when the lever is pushed the way it is when the control knob is pushed in,the contacts are closed.If the heater didn't start with the knob pulled out, perhaps cleaning those contacts will help.If the thermo swich seems different than what I've described then you may have the more difficult one that I don't know about.
The thermostat switch controls the heat by turning off the current to the fuel pump when the air gets too hot. when it cools down it swiches on again. Without the switch(your bypass) the heater can get too hot and blow that fuse thats on top of the heater.Hope this helps --at least something to try. I'd definately suggest getting that manual from The Thing Shop though. Ray
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
dan macmillan
Samba Member


Joined: October 19, 2003
Posts: 3106
Location: Northern Ontario, Canada
dan macmillan is offline 

PostPosted: Wed Feb 27, 2008 7:43 pm    Post subject: Reply with quote

1973vwthing wrote:
i bypassed the push pull thermostat by putting the 2 blue wires that run to it together...the heater stayed on and when i switched the power knob off the pump stopped clicking but the fan kept running for a bit(to clear exhaust gases?) then shut off on it's own....is it bad to run heater like this?....how hot should it get if thermostat is bypassed...i only ran it for 5 minutes or so....thanks again!!1


This is normal operation. If you listen closely it will spin slowly at first. When it gets to a set temp the blower will speed up. If you turn it off when running slow it will stop instantly. If it is at normal operating temp and spinning fast, it will run on after turned off to cool the inner chamber.

Not a good idea to bypass the stat other than to test it. It will eventually get hot enough to trip the reset and shut down.
_________________
Licensed Automotive Service Technician
Licensed Truck and Coach Technician
Licensed Heavy Duty Equipment Technician
CFC/HCFC/HFC A/C handling and installation license
Alignment specialist
66 Modified Manx,68 Kyote,74 Thing,74 Beetle, 76 Transporter,75 self made Double Cab,65 Meyers Manx,78Westy,68 Ghia, 79 Bradley GT2
Current projects:
Built for others:69 Manx Clone
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
1973vwthing
Samba Member


Joined: April 21, 2006
Posts: 108

1973vwthing is offline 

PostPosted: Thu Feb 28, 2008 1:01 am    Post subject: Reply with quote

thanks for the replies... i have the square type thermostat that pushes in and sits in the heater duct just before it entoers firewall...i will try different adjustments on thermostat...the heater fuel pump is acting up...works fine for a bit then stops i hit it then it starts again and so on...probably on its way out?...any way to get it apart?..it's the later style straight pump.....thanks again everyone!!!
Back to top
View user's profile Send private message Classifieds Feedback
crofty
Judas of the North


Joined: August 09, 2000
Posts: 18409
Location: Land of Whine and Phonies
crofty is offline 

PostPosted: Thu Feb 28, 2008 8:32 am    Post subject: Reply with quote

Try cleaning the points in the fan motor. It's those points that cause the pump to pulse and the plug to fire.
_________________
When in doubt, logo it out!!

HamburgerBrad wrote:

I slept on crofty's tent once. I passed out drunk from two bottles of Everett's brother's wine.
Back to top
View user's profile Send private message Visit poster's website Gallery Classifieds Feedback
1973vwthing
Samba Member


Joined: April 21, 2006
Posts: 108

1973vwthing is offline 

PostPosted: Thu Feb 28, 2008 4:01 pm    Post subject: Reply with quote

i can read voltage jumping up and down on the wires going to the pump...probably pump is on its way out?
Back to top
View user's profile Send private message Classifieds Feedback
1973vwthing
Samba Member


Joined: April 21, 2006
Posts: 108

1973vwthing is offline 

PostPosted: Sun Mar 02, 2008 10:10 pm    Post subject: Reply with quote

got heater fuel pump working...just stuck...i made some adjustments to the thermostat and seems better...wondering how long heater should run before thermostat shuts it down...what is the proper position of the little white plastic cam that hits the contact to shut heater down?(this seems to be my problem) how do you adjust thermostat to stay on longer? manual doesn't cover this...thanks again!!!
Back to top
View user's profile Send private message Classifieds Feedback
crofty
Judas of the North


Joined: August 09, 2000
Posts: 18409
Location: Land of Whine and Phonies
crofty is offline 

PostPosted: Tue Mar 04, 2008 8:57 am    Post subject: Reply with quote

Run on is around 2 minutes. It's mentioned in the manual.
_________________
When in doubt, logo it out!!

HamburgerBrad wrote:

I slept on crofty's tent once. I passed out drunk from two bottles of Everett's brother's wine.
Back to top
View user's profile Send private message Visit poster's website Gallery Classifieds Feedback
Ray Syverson
Samba Member


Joined: February 12, 2006
Posts: 72
Location: Lake Zurich, Illinois
Ray Syverson is offline 

PostPosted: Tue Mar 04, 2008 3:03 pm    Post subject: Reply with quote

There is a temperature range that the thermostat is supposed to keep the heat at (something like 120-150 degrees,I dont have my manual here).After adjusting the thermostat switch on my heater I ran it and held my hand under the outlet under the dash. It seemed to be a bit less hot than before and that was what I was after.I could feel the temp drop down slightly when the thermo switch opened and then rise again when it closed.When you shut the heater off it should cntinue blowing for awhile till the temperature comes down ,then shut off completely.
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Woreign
Samba Member


Joined: June 04, 2006
Posts: 2841
Location: Crestview FL
Woreign is offline 

PostPosted: Tue Mar 04, 2008 8:57 pm    Post subject: Reply with quote

You can safely adjust the thermostat to 212 degrees by placing it in boiling water. When the thermostat has opened (twisted) completely, adjust the plastic cam so that it just interrupts the switch. I did this on my heater and it works very well. Any hotter and the built in safety circuit will trip. I think it trips around 265 or something.

If you're having run-on issues, you may need to adjust the flame sensor. It is located on the back-left side of the heater (facing the open trunk). It adjusts with a flat blade screw driver. If it the fan won't shut off, turn the screw until it does.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Ian Epperson
Samba Member


Joined: January 12, 2005
Posts: 2259
Location: Alameda, CA
Ian Epperson is offline 

PostPosted: Tue Mar 04, 2008 10:17 pm    Post subject: Reply with quote

1973vwthing wrote:
i can read voltage jumping up and down on the wires going to the pump...probably pump is on its way out?


As you may have figured out, that's normal operation. Those pumps are pretty indestructible, but if you let them sit idle for more than a month or two, they'll start to freeze up - a good cleaning and/or hitting them and running them will free them up again.

1973vwthing wrote:
i bypassed the push pull thermostat by putting the 2 blue wires that run to it together...the heater stayed on and when i switched the power knob off the pump stopped clicking but the fan kept running for a bit(to clear exhaust gases?) then shut off on it's own....is it bad to run heater like this?....how hot should it get if thermostat is bypassed...i only ran it for 5 minutes or so....thanks again!!


Once you do this, the heater will run until it blows the overtemp fuse. If that fuse doesn't blow at 300 degrees (or so), then that particular safety feature isn't working properly. Did someone swap out the 8 amp fuse with something bigger? When it trips, it shorts out the circuit and intentionally blows - which can be disconcerting and make you think you need a bigger fuse.

The thermostat is supposed to prevent it from getting so hot that the fuse blows. Since it kept cooling off, it sounds like your thermostat was at least functional - it may have been wedged into a low temperature or something, but at least it was turning off the heater appropriately.
_________________
VW-181 shirts and stickers.
http://ian.epperson.com/vw
Back to top
View user's profile Send private message Visit poster's website Gallery Classifieds Feedback
1973vwthing
Samba Member


Joined: April 21, 2006
Posts: 108

1973vwthing is offline 

PostPosted: Wed Mar 05, 2008 9:05 am    Post subject: Reply with quote

i belive everything is in working order according to manual...it's just getting the square thermostat that sits on the heater adjusted right...gonna fiddle with it more...thanks for the responses!!!
Back to top
View user's profile Send private message Classifieds Feedback
1973vwthing
Samba Member


Joined: April 21, 2006
Posts: 108

1973vwthing is offline 

PostPosted: Thu Mar 06, 2008 7:00 pm    Post subject: Reply with quote

does anyone know if the little metal piece that the plastic cam in thermostat touches (square kind mounted on duct going into firewall) is supposed to separate from one of the contacts...or what type of movement does this little metal strip make when the plastic cam hits it...not sure if it's this metal strip that is out of wack...i think this is my problem...hope this makes sense...thanks!!!
Back to top
View user's profile Send private message Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Thing/Type 181 All times are Mountain Standard Time/Pacific Daylight Savings Time
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2018, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB