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Old 03-23-2020, 09:47 AM
aktrapper aktrapper is offline
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Join Date: Aug 29, 2008
Location: Carlisle, PA
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Vacuum Questions

So the vacuum in my 89 GW has been minimized and I was changing the radiator hoses and heater hoses and I have three specific questions. The JEEP is running pretty well right now so I don't believe there is a problem with the vacuum set-up.

1) In the front of the engine where the radiator hose and bypass enter the engine (with the thermostat), there is a CTO (I think it is the HDC CTO valve) with three vacuum ports. None of the three are plugged or connected to anything. Can I remove this CTO and plug the hole with a bolt? If not, should the vacuum ports be capped off?

2) in the back of the engine where the heater hose enters the engine, there is another valve with six valves and none of them are connected or capped. Same question - can I remove the valve and plug it with a bolt? If not, should the valves be capped?

3) The EGR valve (soup can sized silver disk with one valve in the back of the engine) isn't capped - should it be?

TIA
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Old 03-23-2020, 03:02 PM
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rang-a-stang rang-a-stang is offline
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1) yes. Remove it and plug the hole. I would use a brass plug to prevent it from rusting too bad.
2) yes. But it's easier than #1. Remove the pipe from the top of the brass block that connects the hose that goes to the heater core, then remove the brass block from the intake, then insert the pipe you had removed from the top of the block into the hole in the intake. (Then PM me and I will buy that block from you...)
3) There is no vacuum leak there but I do not like open nipples myself. Leave it open or plug it. It's up to you (it makes no difference either way).
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Old 03-23-2020, 03:54 PM
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babywag babywag is offline
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they are pipe thread not regular bolt threads.
need to use NPT plugs if removing.
be advised in PA they may not be easy to remove...

if nothing attached to them they can be left alone/as-is
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Old 03-24-2020, 08:22 AM
aktrapper aktrapper is offline
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Thanks guys. Fortunately my Waggy is registered in Alaska so I don't have to worry about PA emissions.

Rang-a-stang - once I get that part off, I'll let you know.
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Last edited by aktrapper : 03-24-2020 at 08:28 AM.
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