87MJTIM Posted September 1, 2018 Share Posted September 1, 2018 I deleted the heater control valve Link to comment Share on other sites More sharing options...
Pete M Posted September 2, 2018 Share Posted September 2, 2018 Link to comment Share on other sites More sharing options...
cruiser54 Posted September 2, 2018 Share Posted September 2, 2018 Some folks are slow to catch on.....LOL. Link to comment Share on other sites More sharing options...
HOrnbrod Posted September 2, 2018 Share Posted September 2, 2018 5 hours ago, 87MJTIM said: I deleted the heater control valve Make it even better by converting to an open cooling system. Link to comment Share on other sites More sharing options...
cruiser54 Posted September 3, 2018 Share Posted September 3, 2018 On 9/1/2018 at 9:12 PM, HOrnbrod said: Make it even better by converting to an open cooling system. Yes. Link to comment Share on other sites More sharing options...
87MJTIM Posted September 3, 2018 Author Share Posted September 3, 2018 How do I keep the e-fan WITHOUT having to wire in a manual override switch? EDIT: I have read and watch Youtube videos (Nickintime converted to open) that indicate the newer radiators do not have the e-fan switch bung. That was why I did not want to make the conversion. Is it correct that the radiators do no have the switch bung? Link to comment Share on other sites More sharing options...
DirtyComanche Posted September 3, 2018 Share Posted September 3, 2018 7 hours ago, 87MJTIM said: How do I keep the e-fan WITHOUT having to wire in a manual override switch? EDIT: I have read and watch Youtube videos (Nickintime converted to open) that indicate the newer radiators do not have the e-fan switch bung. That was why I did not want to make the conversion. Is it correct that the radiators do no have the switch bung? I have an open style radiator in my XJ and it has the temperature switch in it. I believe the one in my MJ has the bung for it too. The later later HO thermostat housing has the bung for the switch in it, IIRC. IMHO, I'd not likely ever convert to an open system again given that there is better pressure bottles available now. That was the weak point of the closed system, otherwise it functions perfectly. Link to comment Share on other sites More sharing options...
87MJTIM Posted September 3, 2018 Author Share Posted September 3, 2018 I have not had any problems with the closed system, either. Yes, I have replaced the pressure bottle a couple times over the last 31 years. I did purchase the Volvo cap. I was changing all the hoses so I figured I might as well delete the HCV while I was there. I have read that new cars are getting the closed systems again. Link to comment Share on other sites More sharing options...
HOrnbrod Posted September 4, 2018 Share Posted September 4, 2018 If no one is having problems with their closed systems, why is there normally a new thread every week or so about trapped air causing overheating in closed systems? Link to comment Share on other sites More sharing options...
DirtyComanche Posted September 4, 2018 Share Posted September 4, 2018 9 minutes ago, HOrnbrod said: If no one is having problems with their closed systems, why is there normally a new thread every week or so about trapped air causing overheating in closed systems? User error. Link to comment Share on other sites More sharing options...
gogmorgo Posted September 4, 2018 Share Posted September 4, 2018 Closed cooling systems are more effective than open, just less tolerant of leaks. Open systems will replenish themselves in the event of a small leak until the drain the overflow, but closed systems just push out the full volume of coolant. The tendency of air to collect at the top of the rad does make the open system with an outlet for air at the top of the rad a bit more effective at self-burping, but not by a huge amount. Newer vehicles are mostly closed systems now, just because they are more effective, when the entire volume of coolant is used as part of the system. They have a higher heat capacity. Leaks are a reality for 30-year-old trucks. People who don't understand how closed systems work will suffer from this, yeah. Link to comment Share on other sites More sharing options...
DirtyComanche Posted September 4, 2018 Share Posted September 4, 2018 52 minutes ago, 87MJTIM said: I have read that new cars are getting the closed systems again. Have been for a long time. About as long ago as when Chrysler went backwards from it in the XJ/MJ. Then they killed the MJ off a couple years after that... Not sure why some people endear Chrysler so much. Link to comment Share on other sites More sharing options...
HOrnbrod Posted September 4, 2018 Share Posted September 4, 2018 Perhaps Dirty. But I see closed-to-open cooling system conversions being performed all the time, but never the reverse. Link to comment Share on other sites More sharing options...
gogmorgo Posted September 4, 2018 Share Posted September 4, 2018 Open systems are easier. I see people going to lengths to improve their open systems all the time. Link to comment Share on other sites More sharing options...
HOrnbrod Posted September 4, 2018 Share Posted September 4, 2018 9 minutes ago, DirtyComanche said: Have been for a long time. About as long ago as when Chrysler went backwards from it in the XJ/MJ. Then they killed the MJ off a couple years after that... Not sure why some people endear Chrysler so much. Pretty simple - Chrysler was/is in the business of making money. The MJ wasn't doing it for them, even after they junked the Renix and upgraded to the Mopar ignition system. The XJ continued to sell well so they kept it around. What I don't get is why some people still love the quirky Renix system. Double Link to comment Share on other sites More sharing options...
87MJTIM Posted September 4, 2018 Author Share Posted September 4, 2018 3 minutes ago, HOrnbrod said: What I don't get is why some people still love the quirky Renix system. Because that is what mine came with from the factory. Someone asked me once why I drive an old truck. "Why don't you buy a new one?" I said, "they stopped making then in '92." The person then gives me puzzled look. Link to comment Share on other sites More sharing options...
HOrnbrod Posted September 4, 2018 Share Posted September 4, 2018 You have a great reason for not making any changes - you are one of those uber-rare original owners. Not many of those around anymore. Hope you're still driving it for another thirty+ years. Link to comment Share on other sites More sharing options...
DirtyComanche Posted September 4, 2018 Share Posted September 4, 2018 5 hours ago, HOrnbrod said: Pretty simple - Chrysler was/is in the business of making money. The MJ wasn't doing it for them, even after they junked the Renix and upgraded to the Mopar ignition system. The XJ continued to sell well so they kept it around. What I don't get is why some people still love the quirky Renix system. Double Chrysler could have made money on it but favoured their own inferior Dakota. Chrysler has always protected their line of lame Dodge trucks, look at all the interest there has been for a Wrangler/Jeep truck for the last 10+ years, yet they won't make one. AMC had dropped the ball on marketing the Comanche, and it was a victim of bad timing given their financial situation, but it could likely have been saved. As why love the Renix system... Why love the OBD-I HO system? I don't look at it and see any upgrade beyond them having put a fuse box in rather than fusible links, but it doesn't have a knock sensor so it certainly went backwards in that regard. Personally I like having a knock sensor. You'll probably counter by saying this forum is full of nothing but Renix guys having problems, which it is, which is logical since the vast majority of the trucks on here use the Renix system as Chrysler was already working hard to kill the Comanche by the time they went to the HO. Link to comment Share on other sites More sharing options...
Eagle Posted September 4, 2018 Share Posted September 4, 2018 9 hours ago, HOrnbrod said: Pretty simple - Chrysler was/is in the business of making money. The MJ wasn't doing it for them, even after they junked the Renix and upgraded to the Mopar ignition system. The XJ continued to sell well so they kept it around. What I don't get is why some people still love the quirky Renix system. Double At the time, the word from the folks at the dealership was that Chrysler killed off the MJ because it was cutting into Dakota sales ... they didn't want Jeep trucks competing with Dodge trucks in the same price range and market segment. Let's face it -- if they had offered an extended cab with the MJ, they would have tripled or quadruples their sales, easily. The lack of an extended cab was why my first "modern" (at the time) Jeep was a Cherokee rather than a Comanche. Link to comment Share on other sites More sharing options...
HOrnbrod Posted September 4, 2018 Share Posted September 4, 2018 Times change, buying preferences change. How many MJs did Chrysler sell in 92? Not many. The MJ was dying just like all the other "small" trucks at the time like the S10 and Ranger. Chrysler could have made an extended cab or a 4DR or a V8 MJ; it still would have died no matter who was marketing the truck. Get real - it wasn't Chrysler's fault that the MJ died; the MJ was already dead when Chrysler took over Jeep. And finally, after many facelifts and styling mods, the evil Dakota died too. I love MJs or I wouldn't be driving one - we all do here. I'd even have a Renix MJ if that's all there was. But the drivetrain would be history pretty quick. Link to comment Share on other sites More sharing options...
Pete M Posted September 4, 2018 Share Posted September 4, 2018 each XJ represented a profit... each MJ represented a loss... and they were built on the same line. the math is the math. apparently AMC kept the MJ going because they thought they needed a small truck. Chrysler simply had no desire to throw away more XJ profits and so I'm actually a little surprised it even made it to 91. Link to comment Share on other sites More sharing options...
Wounded_Fighter Posted September 4, 2018 Share Posted September 4, 2018 1 hour ago, Pete M said: Chrysler simply had no desire to throw away more XJ profits and so I'm actually a little surprised it even made it to 91. any yet they are supposedly bringing it back. Link to comment Share on other sites More sharing options...
gogmorgo Posted September 4, 2018 Share Posted September 4, 2018 Nah, they're building a new scrambler. It'll be alright, but not quite the same thing. Link to comment Share on other sites More sharing options...
Wounded_Fighter Posted September 4, 2018 Share Posted September 4, 2018 Not from what i heard at branch near me, but he may be mistaken. Link to comment Share on other sites More sharing options...
gogmorgo Posted September 4, 2018 Share Posted September 4, 2018 It's based on the wrangler, not one of the "crossovers" is what I meant. It'll be body on frame, not half and half like the MJ. That's what I was referencing, at least. Link to comment Share on other sites More sharing options...
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