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  #1  
Old August 24th, 2007, 21:06
RabidRabit RabidRabit is offline
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Question Radiator Swap

O.K. I finally got rid of the closed pressure system and installed a rad from a 95XJ into my 89. No problemo. The only thing that has me scratching my head is the vacuum valve or whatever it is that is on the line right in front of the fire wall going to the heater core. There is a little vacuum line that runs through the fire wall and my guess is it goes to the heater core. Do I just plug this or cut it off or......
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Old August 24th, 2007, 21:35
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Stihl029 Stihl029 is offline
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Re: Radiator Swap

The vaccum line that went to your valve should hook up to that one. I am doing the same on my 88, but because it is a bit colder here I am not installing the valve to the core.
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Old August 25th, 2007, 00:22
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Blaine B. Blaine B. is offline
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Re: Radiator Swap

The vacuum hose runs to your HVAC panel. It closes flow to the heater core when you don't have the heat on.

Although newer XJ's didn't come with a valve anyway and coolant always flowed through the heater core.
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Old August 25th, 2007, 01:31
RabidRabit RabidRabit is offline
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Re: Radiator Swap

I haven't seen anything like this on any of the newer XJ's so I'm just wondering if I need to do anything with the vacuum line.
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Old August 25th, 2007, 03:37
cwstnsko cwstnsko is offline
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Re: Radiator Swap

If you removed the old valve completely as part of your upgrade and did not replace it with the newer style, then you just cap off the vacuum line. If you did install the newer style valve, you should connect the line to the new valve.
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Old August 25th, 2007, 11:14
RabidRabit RabidRabit is offline
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Smile Re: Radiator Swap

Thanx much.
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