Jeep Wrangler TJ Cooling System Overhaul FAQ


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Chris

Chris

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@Chris, I just want to confirm that Mopar 55037652AA does fit properly in a 1997 4.0 with a manual transmission.

Yes, I pulled that info from the part diagrams directly. However, it appears that since you can no longer even lookup parts for a 1997 online (see https://wermopar.com for what I am talking about), they have changed it so it now says it fits 2001 and up models.

But yes, it does indeed fit your 1997 4.0 with a manual.
 

rdu-jeep

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So it's OK to do this cooling system overhaul without replacing the radiator, water pump, and fan clutch? Or should I really do these as preventative measures?
208k on the odometer and I don't know if this has ever been done. No overheating/cooling issues that are visible.
 
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So it's OK to do this cooling system overhaul without replacing the radiator, water pump, and fan clutch? Or should I really do these as preventative measures?
208k on the odometer and I don't know if this has ever been done. No overheating/cooling issues that are visible.

Well if you do it without replacing the radiator, water pump, or fan clutch, that's not really overhauling the cooing system. In fact, if you don't replace those parts, what are you even replacing at all?

With 208k and no history of ever having done the cooling system, I think you'd be pretty foolish not to at least have this on your radar (and that includes all of it).
 

rdu-jeep

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Well if you do it without replacing the radiator, water pump, or fan clutch, that's not really overhauling the cooing system. In fact, if you don't replace those parts, what are you even replacing at all?

With 208k and no history of ever having done the cooling system, I think you'd be pretty foolish not to at least have this on your radar (and that includes all of it).

I figured flushing the system is better than nothing. I have never done anything like this so I am hesitant ... but it's not my DD so what do I have to lose? I'll do everything! Thanks for the pep talk :D
 
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I figured flushing the system is better than nothing. I have never done anything like this so I am hesitant ... but it's not my DD so what do I have to lose? I'll do everything! Thanks for the pep talk :D

Flushing the system is better than nothing, you're right.

I'm not saying you have to do everything now, but I'd at least start acquiring the parts and have it on your radar (y)
 
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MountaineerTom

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With the mileage you have and not knowing the history, it would be wise to change it all out. Replacing items one at a time runs the risk pf other worn/weak components going out on you shortly after.

Something it did over almost a years time was buy all the parts I needed every now and then. It can be costly to buy all that stuff at once, especially if you buy MOPAR parts, so that spread the cost out over time (if you have that time and don't need to do it immediately). This past November I replaced everything in the cooling system except the heater core. It had been replaced a little under 2 years earlier when it started leaking.

I'd recommend using the factory constant tension hose clamps if you have them. I had issues with leaks using the worm style clamps. I went back to the factory clamps in November and have had none since.
 

__steve__

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I have learned so much from this site. Thank you to all who contribute.

This thread has me convinced to give this a go as it looks like Mopar radiators are only going to go up in price. I'm new to all this and just wanted to make sure that rockauto.com is an OK place to buy parts from as they have the radiator I need for my '97 4.0 auto transmission for $277 + $14 for shipping.


Or do I just grab it for the $100 more on amazon so I know it's a safe buy?
 

rdu-jeep

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I have learned so much from this site. Thank you to all who contribute.

This thread has me convinced to give this a go as it looks like Mopar radiators are only going to go up in price. I'm new to all this and just wanted to make sure that rockauto.com is an OK place to buy parts from as they have the radiator I need for my '97 w/ auto transmission for $277 + $14 for shipping.


Or do I just grab it for the $100 more on amazon so I know it's a safe buy?

Rock Auto is legit and I have ordered from them for many different vehicles. Solid pricing, good reputation, slightly slower shipping sometimes.
 

Bud125

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Rock Auto is legit and I have ordered from them for many different vehicles. Solid pricing, good reputation, slightly slower shipping sometimes.
Agreed! Rock Auto rocks! That is where I got mine from, sitting on the shelf for when I need it. But as always shop around as there can be a lot of difference depending on what part you are looking for.
 

Ijeepalone

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You're very welcome!

Yes, the OEM radiators were once a lot cheaper, but as Mopar stopped producing them, they've gone up in price significantly. At some point soon you'll never be able to get an OEM radiator again unfortunately.


Hey Chris, you bring up a good point: I think I might order / store a backup OEM radiator for future use on my '05 TJ, since I plan on keeping her for some time. Any other "hard to replace" OEM parts / components anyone can think of that might be good to have on hand for down the road? I imagine a list could be quite extensive, maybe just the big show-stopper parts. Thanks!
 

Vasq

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Hey Chris, you bring up a good point: I think I might order / store a backup OEM radiator for future use on my '05 TJ, since I plan on keeping her for some time. Any other "hard to replace" OEM parts / components anyone can think of that might be good to have on hand for down the road? I imagine a list could be quite extensive, maybe just the big show-stopper parts. Thanks!
OPDA* and Fuel pump
 
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Viking Jeeper

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Hey Chris, you bring up a good point: I think I might order / store a backup OEM radiator for future use on my '05 TJ, since I plan on keeping her for some time. Any other "hard to replace" OEM parts / components anyone can think of that might be good to have on hand for down the road? I imagine a list could be quite extensive, maybe just the big show-stopper parts. Thanks!
I've been considering starting a thread about hard to replace parts. Now I will.
 
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Chris

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Hey Chris, you bring up a good point: I think I might order / store a backup OEM radiator for future use on my '05 TJ, since I plan on keeping her for some time. Any other "hard to replace" OEM parts / components anyone can think of that might be good to have on hand for down the road? I imagine a list could be quite extensive, maybe just the big show-stopper parts. Thanks!

All the electronic sensors, OPDA, fuel pump, radiator, water pump, and I think that's most of it.

Oh, and most importantly, a replacement PCM, which you can talk to @Wranglerfix about. Above anything else, the PCM is the most important.
 
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__steve__

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Rock Auto is legit and I have ordered from them for many different vehicles. Solid pricing, good reputation, slightly slower shipping sometimes.

I did this today and figured I'd post the RockAuto order. If nothing else it'll show a snapshot in time for prices and list of part numbers that worked for a '97 4.0 Automatic with no AC. I had replaced the heater core and hoses a while back. Today was the rest of it with the following list. The only thing that seemed a little off was the bottom radiator hose needed a few inches cut off. The Hose Clamp Pliers wasn't very useful.

Thanks again for all of the great HowTo resources up here.

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