dkmcgowan Posted June 20, 2015 Share Posted June 20, 2015 So I bought an 89 Comanche, plan to start a thread soon, but it already had the cooling system completely redone. It's got a brand new radiator, hoses, thermostat, and water pump... It has the original pressurized tank and I wanted to upgrade that, so I decided I wanted to get the expansion tank from Mac's Radiator. It will mount in the stock location and I can use the new nice radiator. It's expensive, but I'm fine with that to keep all the rest stock. http://macsradiatorshop.com/miscellaneous/replacment-jeep-radiator-fill-tanks.html So my question is now I need an overflow tank, and I've read about tons people have tried, but I am trying to figure out which overflow bottle is used below, it looks like a great fit. Also, once I use this new expansion tank I assume I will fill things up differently. With the pressurized tank you wanted it about half full when cold and had to struggle to bleed the system a little. With the new expansion tank, shouldn't I fill the expansion tank all the way up to the top and then the overflow tank half full and bleed the system like a newer XJ open system? Link to comment Share on other sites More sharing options...
PIKE Posted June 20, 2015 Share Posted June 20, 2015 The best expansion tank to get is a OEM Mopar that is for a Jeep with a 2.5 liter 4 cylinder. There were some on ebay a while ago. And yes fill just as you described. Also do the burp by removing the temp. sending unit on the back of the head. Link to comment Share on other sites More sharing options...
PIKE Posted June 20, 2015 Share Posted June 20, 2015 http://www.ebay.com/itm/Jeep-CHRYSLER-OEM-84-90-Cherokee-2-5L-L4-Engine-Coolant-Recovery-Tank-52003213-/271879570919?hash=item3f4d4905e7&vxp=mtr There are still some for sale. Mopar doesn't make these anymore and I think they are better than the ones from Crown. I had a Crown one that leaked. What makes this bottle nice is all the mounting holes are already there, it just bolts in with 2 little screws. Link to comment Share on other sites More sharing options...
sinkrun Posted June 20, 2015 Share Posted June 20, 2015 Mine came with a new radiator also or I would have bought a newer model with the fill neck in the rad. This is what I used much cheaper and if you shop around and check the size of your hose the link is just the style you may find one cheaper. http://www.ebay.com/itm/Moroso-63740-Radiator-Hose-Filler-Inline-Aluminum-Natural-1-5in-1-25in-/261934147245?hash=item3cfc7de6ad&vxp=mtr I removed the tank and the mess of hoses including the heater valve which is not needed and ran two standard heater hoses just like the newer XJ`s. I used a overflow tank like the one in your picture same spot but have upgraded to a 2.5 overflow for a better fit just havent installed it yet. Link to comment Share on other sites More sharing options...
dkmcgowan Posted June 21, 2015 Author Share Posted June 21, 2015 Awesome, I ordered that just now... I keep reading conflicting info, some say in an 89 with 4.0 it fits right in, others say they have to move some stuff around like egr stuff and something else, we will see. Also, since the system will be open, can't I burp it by just keeping overflow full? No need to unscrew temp sensor anymore right, just take time heating and cooling and keeping levels good and it will normalize itself, that's all I do on my CJ and my old newer XJ with open systems. Link to comment Share on other sites More sharing options...
sinkrun Posted June 21, 2015 Share Posted June 21, 2015 I moved something on mine it was just something on the fender don't remember what just one screw was holding it. I can get you A pick sometime Sunday if you want its raining out now. Link to comment Share on other sites More sharing options...
Eagle Posted June 21, 2015 Share Posted June 21, 2015 http://www.ebay.com/itm/Jeep-CHRYSLER-OEM-84-90-Cherokee-2-5L-L4-Engine-Coolant-Recovery-Tank-52003213-/271879570919?hash=item3f4d4905e7&vxp=mtr There are still some for sale. Mopar doesn't make these anymore and I think they are better than the ones from Crown. I had a Crown one that leaked. What makes this bottle nice is all the mounting holes are already there, it just bolts in with 2 little screws. I wish I had thought of the 2.5L overflow bottle when I did my expansion tank upgrade. Live and learn. Link to comment Share on other sites More sharing options...
PIKE Posted June 21, 2015 Share Posted June 21, 2015 Awesome, I ordered that just now... I keep reading conflicting info, some say in an 89 with 4.0 it fits right in, others say they have to move some stuff around like egr stuff and something else, we will see. Also, since the system will be open, can't I burp it by just keeping overflow full? No need to unscrew temp sensor anymore right, just take time heating and cooling and keeping levels good and it will normalize itself, that's all I do on my CJ and my old newer XJ with open systems. You can get rid of all the egr stuff to make room. Just remove all the plastic hoses and whatever and cap off where they went with rubber caps. Its a whole lot of stuff that doesn't do anything. You will also have to relocate your ballast resistor, but that's easy too. I would still recommend removing the temp sender to burp. Forgot to say good choice on the Macs. What's the saying? "Buy once cry once" You will never have a problem with it. Wish I could post some pics, good luck. Link to comment Share on other sites More sharing options...
cruiser54 Posted June 21, 2015 Share Posted June 21, 2015 I have a Mac's on my MJ. Works great. Link to comment Share on other sites More sharing options...
Rubikahn Posted August 14, 2021 Share Posted August 14, 2021 Just got the Mac’s overflow tank installed. I see that people are using the 2.5L overflow and installing it over by the air box. My only question is, isn’t that too long of a run? Has anyone used the 97-01 XJ overflow? Anyone have any pics of either set up? PFA Link to comment Share on other sites More sharing options...
87MJTIM Posted August 14, 2021 Share Posted August 14, 2021 Mine is a 4.0 Link to comment Share on other sites More sharing options...
Rubikahn Posted August 14, 2021 Share Posted August 14, 2021 33 minutes ago, 87MJTIM said: Mine is a 4.0 Are you running closed or open cooling? Link to comment Share on other sites More sharing options...
PIKE Posted August 14, 2021 Share Posted August 14, 2021 2 hours ago, Rubikahn said: Just got the Mac’s overflow tank installed. I see that people are using the 2.5L overflow and installing it over by the air box. My only question is, isn’t that too long of a run? Has anyone used the 97-01 XJ overflow? Anyone have any pics of either set up? PFA Yes install the 2.5 expansion bottle by the air cleaner. Mounting holes are already there. Run your hose alone the fire wall and behind the washer fluid bottle. Works just fine. Link to comment Share on other sites More sharing options...
Rubikahn Posted August 14, 2021 Share Posted August 14, 2021 31 minutes ago, PIKE said: Yes install the 2.5 expansion bottle by the air cleaner. Mounting holes are already there. Run your hose alone the fire wall and behind the washer fluid bottle. Works just fine. Perfect , thank you sir Link to comment Share on other sites More sharing options...
87MJTIM Posted August 14, 2021 Share Posted August 14, 2021 2 hours ago, Rubikahn said: Are you running closed or open cooling? I switched to open Link to comment Share on other sites More sharing options...
Rubikahn Posted August 14, 2021 Share Posted August 14, 2021 40 minutes ago, 87MJTIM said: I switched to open Gotcha, I’m still running a closed system Link to comment Share on other sites More sharing options...
Rubikahn Posted August 17, 2021 Share Posted August 17, 2021 Ok, so I got the 2.5L expansion tank and some hose. For some reason the cap didn’t come with the tank, and it says it’s no longer available. What did everyone use for a cap? The original cap from the 4.0 overflow tank does not fit on the 2.5L tank. Link to comment Share on other sites More sharing options...
PIKE Posted August 17, 2021 Share Posted August 17, 2021 Check out this thread. Link to comment Share on other sites More sharing options...
PIKE Posted August 17, 2021 Share Posted August 17, 2021 On 8/14/2021 at 5:17 PM, Rubikahn said: Gotcha, I’m still running a closed system Once you use the Macs tank with the 2.5 expansion bottle you have an open system. Fill the Macs tank to the top and the expansion bottle between the high and low marks. Link to comment Share on other sites More sharing options...
Rubikahn Posted August 17, 2021 Share Posted August 17, 2021 1 hour ago, PIKE said: Once you use the Macs tank with the 2.5 expansion bottle you have an open system. Fill the Macs tank to the top and the expansion bottle between the high and low marks. 👍 Link to comment Share on other sites More sharing options...
Rubikahn Posted August 17, 2021 Share Posted August 17, 2021 1 hour ago, PIKE said: Check out this thread. Just ordered the Dorman cap on Amazon, thanks bud! Link to comment Share on other sites More sharing options...
Rubikahn Posted August 18, 2021 Share Posted August 18, 2021 23 hours ago, PIKE said: Once you use the Macs tank with the 2.5 expansion bottle you have an open system. Fill the Macs tank to the top and the expansion bottle between the high and low marks. Didn’t even think of it that way, duh… thank you 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