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Regular
Posts: 86
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? |
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Expert 5K+
Posts: 5007
| You mean this?
http://www.ebay.com/itm/NEW-TEMPERATURE-CONTROL-VALVE-1956-1957-195... |
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Expert
Posts: 3780
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. |
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Regular
Posts: 86
Location: MN | Thanks. So a heater valve would still work okay without the cap tube?
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Board Moderator & Exner Expert 10K+
Posts: 13055
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. |
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Regular
Posts: 86
Location: MN | Thank you for the clarification. The search continues - which is part of the fun in this hobby! |
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Expert 5K+
Posts: 7417
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
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Expert
Posts: 3780
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. |
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