Shane Posted October 30, 2011 Share Posted October 30, 2011 I have a 1989 Mj Pioneer 4x4 and auto. I got a aluminum bottle from macs radiator on it and it still over heats slightly. Could this be the radiator? If so what radiator would be a good replacement? 1 or 2 row? Any advice is appreciated. Link to comment Share on other sites More sharing options...
foreman1063 Posted October 31, 2011 Share Posted October 31, 2011 Could be the radiator, could be the water pump, could be air in the system. Hard to say, can you describe the symptoms? Link to comment Share on other sites More sharing options...
gl1200aman Posted October 31, 2011 Share Posted October 31, 2011 Check the fins between the tubes. All the jeep 4.0 radiators that I have had go bad where the cooling fins separate from the tubes. I always replace with a 2 row, it may be more than needed but I figure the thermostat can control the flow and maintain the temp. A single row may work fine depending on your area, ambient temp, driving habits, and traffic patterns. I also get the all metal radiators and stay away from those with plastic end caps. Link to comment Share on other sites More sharing options...
Pete M Posted October 31, 2011 Share Posted October 31, 2011 when does it overheat? and how hot is it getting? Link to comment Share on other sites More sharing options...
Comanche County Posted November 1, 2011 Share Posted November 1, 2011 A one row aluminum rad cools as good or better than a two row copper rad. Many manufacturers use aluminum now as OEM. Link to comment Share on other sites More sharing options...
Shane Posted November 1, 2011 Author Share Posted November 1, 2011 It gets hot while I driving it down the road and I haven't been stuck in traffic. It take about 10 mins to heat up. I don't kow how hot because it still has the idiot lights in it. Link to comment Share on other sites More sharing options...
Comanche County Posted November 1, 2011 Share Posted November 1, 2011 You should think about getting an infrared thermometer. They're not that expensive and it will tell you the temp of any component under the hood. Again, back to Pete's question, its key. You need to figure out if its actually overheating or not. These engines typically run at 210 or so, 4.0 right? I don't know what temp triggers the idiot light, someone here does though. Link to comment Share on other sites More sharing options...
ParadiseMJ Posted November 1, 2011 Share Posted November 1, 2011 My personal rule of thumb for diagnostics on overheating... On highway at speed is a coolant circulation problem: Radiator, water pump, air in lines, heater core clogged etc. In traffic, crawling, at idle etc. is an air circulation problem: Fan clutch, e-fan, blocked radiator etc. Any other time for no apparent reason is a pressure/air problem: Bad or inadequate cap, cracked bottle, pinner leak, air in system etc. Link to comment Share on other sites More sharing options...
AMCJeepMJ Posted November 1, 2011 Share Posted November 1, 2011 I also get the all metal radiators and stay away from those with plastic end caps. Around here [Oregon], the highway department puts magnesium chloride on the roads as a de-icer in the winter [and volcanic cinder for traction which damages paint and windows, but that's another story]. Magnesium chloride corrodes aluminum, and a plastic-capped radiator may be more beneficial as there is less exposed aluminum by having a portion that is plastic. I replaced my radiator in my 87 this year with a plastic capped one just because of this consideration, since the last one was eaten thin [and seeping] from years of de-icer exposure. Link to comment Share on other sites More sharing options...
carnuck Posted November 7, 2011 Share Posted November 7, 2011 Do a '91 up 4.0L XJ rad so it has a cap! Direct swap by the way. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now