The Forward Look Network
The Forward Look Network
Search | Statistics | User Listing Forums | Chat | eBay | Calendars | Albums | Skins | Language
You are logged in as a guest. ( logon | register )

Heater Control Valve - Model 705 Heater
Jump to page : 1
Now viewing page 1 [50 messages per page]
View previous thread :: View next thread
   Forward Look Technical Discussions -> Heating, Cooling and Air ConditioningMessage format
 
Skelly1958
Posted 2016-09-27 1:40 PM (#522178)
Subject: Heater Control Valve - Model 705 Heater


Regular

Posts: 86
252525
Location: MN
When I bought my '58 Belvedere, someone had retro-fitted an incorrect heater valve into the system so I had nothing to work with.

My cousin said I could have the valve, which I planned to rebuild, out of a junked '57 DeSoto he has that also has a Model 705 heater. But someone had been messing with it many years ago and the tip if the capillary tube is broke off.

I'm wondering what the capillary tube is for. I could see if it was an Auto-Temp system but when it's a manually operated system I'm not seeing the capillary tube's function.

Can the valve be used without it or should I locate a valve with the tube intact?
Top of the page Bottom of the page
mikes2nd
Posted 2016-09-27 2:07 PM (#522179 - in reply to #522178)
Subject: Re: Heater Control Valve - Model 705 Heater


Expert 5K+

Posts: 5006
5000
You mean this?

http://www.ebay.com/itm/NEW-TEMPERATURE-CONTROL-VALVE-1956-1957-195...
Top of the page Bottom of the page
57chizler
Posted 2016-09-27 2:27 PM (#522182 - in reply to #522178)
Subject: RE: Heater Control Valve - Model 705 Heater



Expert

Posts: 3768
200010005001001002525
Location: NorCal

The capillary tube senses the heater core temperature and (theoretically) adjusts the coolant flow to maintain the temperature you set with manual lever.
Top of the page Bottom of the page
Skelly1958
Posted 2016-10-02 7:49 PM (#522511 - in reply to #522182)
Subject: RE: Heater Control Valve - Model 705 Heater


Regular

Posts: 86
252525
Location: MN
Thanks. So a heater valve would still work okay without the cap tube?
Top of the page Bottom of the page
wizard
Posted 2016-10-03 2:22 AM (#522525 - in reply to #522178)
Subject: Re: Heater Control Valve - Model 705 Heater



Board Moderator & Exner Expert 10K+

Posts: 13042
500050002000100025
Location: Southern Sweden - Sturkö island
No, the valve will not work as intended without the capillary tube. It's a thermostat which regulates the heating at the set level. Without the capillary tube the heat will be unstable - too hot or too Cold at the chosen level. It will work in on/off mode though.
Top of the page Bottom of the page
Skelly1958
Posted 2016-10-03 10:20 AM (#522538 - in reply to #522525)
Subject: Re: Heater Control Valve - Model 705 Heater


Regular

Posts: 86
252525
Location: MN
Thank you for the clarification. The search continues - which is part of the fun in this hobby!
Top of the page Bottom of the page
1960fury
Posted 2016-10-03 10:33 AM (#522539 - in reply to #522525)
Subject: Re: Heater Control Valve - Model 705 Heater



Expert 5K+

Posts: 7385
50002000100100100252525
Location: northern germany


of all the heater valves i rebuild iirc wizard Svens^ was the only valve still with a working capillary tube i believe i does not make a big, if any, difference. its only there to compensate for a change in coolant temperature or outside temperature to keep the incoming air temperature stable (the capillary rube "sensor" is in the heater box to "monitor" incoming air temperature only, not room temperature) so i guess in reality it does not make a big difference.

Edited by 1960fury 2016-10-03 10:35 AM
Top of the page Bottom of the page
57chizler
Posted 2016-11-11 2:28 PM (#525883 - in reply to #522539)
Subject: Re: Heater Control Valve - Model 705 Heater



Expert

Posts: 3768
200010005001001002525
Location: NorCal

I agree, millions of cars left the factory without the capillary tube on the heater valve. The only time the "automatic" temp control would be an issue is if you were driving through rapidly changing ambient temperature changes....once the valve is opened and the coolant flow stabilizes, the output will remain constant.
Top of the page Bottom of the page
Jump to page : 1
Now viewing page 1 [50 messages per page]
Jump to forum :
Search this forum
Printer friendly version
E-mail a link to this thread

* * * This site contains affiliate links for which we may be compensated * * *


(Delete all cookies set by this site)