jmderyke Posted December 17, 2009 Share Posted December 17, 2009 Does anyone know if the heater valves are exchangeable between 87-92 mj and the 84-90 xj? I have the same valve as the xj on my 86 but it cost $100. as the ones for the later mjs cost $25. I'm sure I can change it, but just wanted to ask if anyone else ran into this before. Link to comment Share on other sites More sharing options...
Eagle Posted December 17, 2009 Share Posted December 17, 2009 XJs and MJs are the same under the hood. The heater valve for 87 thru 90 is different than for 91 thru 92 (MJ) and 91 thru 2001 (XJ). I don't recall if the 86 uses the same valve as the 87 thru 90. Suppoedly the 87 thru 90 XJ/MJ heater control valve crosses to a Chevy valve that's available at all the parts chains, but I don't recall where I read that and I don't have the part number. Link to comment Share on other sites More sharing options...
ParadiseMJ Posted December 21, 2009 Share Posted December 21, 2009 If you have a closed system with the pressure bottle you need the metal (90 and below)plumbing and vac actuated directional heater valve. After 91 the heater valve is completely different. I converted my XJ to an open system and I run the hoses straight to the core and back, no heater valve at all. Better flow, 4 less hose clamps, nice heat, cold A/C. Closed system still requires all that plumbing. Link to comment Share on other sites More sharing options...
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