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April 29th, 2004, 03:13 PM
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3 way Check Valve. The top Hard vacuum line not holding Vacuum.
Where does this line lead? looks like it goes into the cars interior.
Would I be able to leave it unplugged?
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87 GN     
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April 29th, 2004, 08:44 PM
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It is the HVAC (heater, A/C) and goes into the car behind the glove compartment I believe. It doesn't hold vacuum on mine either (maybe holds 5 in. for a few secs) and I don't have a leak, heater and A/C work great. Others have said the same so I don't think it should hold much vac if any. This goes for the cruise control too.
BLMs are at 122 so no problem  If you unplug it, you will not be able to blow A/C or heat though you will get some heat air flow when it is set to hot.
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Scott 87 GN (SOLD) 87 LeSabre T-Type Last edited by MistaScott : April 29th, 2004 at 08:47 PM.
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April 29th, 2004, 09:03 PM
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thats strange that it doesnt hold vacuum. the 3-way check valve I had on there was shot , so I thought it damaged something inside. I will try it with and without to see what happens.
thanks for the help
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87 GN
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April 29th, 2004, 09:18 PM
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Actually, let me qualify that:
I just hooked the new check valve up and haven't tested the vac/BLM with it on. But, I have heard others say their HVAC doesn't hold vac either. I will let you know if my BLM stays low. My cruise line to the "ball" is the same way and my cruise has always held fine so I don't suspect a leak. Try testing vac with the heater/A/C switches off....maybe that has an effect??
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Scott 87 GN (SOLD) 87 LeSabre T-Type
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