Water Temperature Gauge Capillary Tube Repair - Team Camaro Tech
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post #1 of 1 (permalink) Old Aug 19th, 13, 09:30 PM Thread Starter
Senior Tech
John
 
Join Date: Mar 2004
Location: L.A., Ca.
Posts: 285
Water Temperature Gauge Capillary Tube Repair

http://www.ply33.com/Repair/tempgauge

The temperature gauge is a “mechanical” unit consisting of a bulb with fluid (ether) mounted in engine head, a gauge head mounted in the instrument cluster on the dash, and a tube connecting the bulb to the gauge head. The gauge head is actually a pressure sensing unit.

In operation, the coolant in the engine head heats the working fluid in the sensor bulb. As the engine gets hotter the pressure in the bulb and tubing rises. The dash head unit simply reads the pressure on a scale calibrated in degrees Fahrenheit.

A common failure mode is for corrosion to lock the bulb in the engine head. The tubing is twisted off near the bulb when bulb removal is attempted. In this case, the gauge head unit is known to be working properly, the defect is in the tubing and in the loss of fluid from the sealed system.

John
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