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#1
02-07-2024, 05:01 PM
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Tracing vacuum leak in heating circuit
My '63 Bonneville (non-AC) has a vacuum leak which appears to be somewhere behind the tee coming off of the carb. I took the easy way out and initially swapped the vacuum diaphragm outside, but that wasn't it.
Next, I put my MightyVac on the line coming from the tee, and pumped up to 5lbs, which went right out. My next test was to disconnect the line from the inside diaphragm, plug it, and try again. Still, I couldn't hold pressure. What role does the temp control knob play in this? My concern is that the leak is in the control in the dash, but I remain hopeful that it's just another 60-year-old hose. I also haven't taken a deep dive into the shop manual, yet, but that's on the list. Some guidance or insight into this type of issue would be greatly appreciated. TIA
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Lewis -------------------------- Lewis Rosenthal '63 Bonneville Convertible '56 Safari '82 Firebird SE |
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