Topic: ZJ over heating (Read 6834 times)

jay140285 · « **on:** August 21, 2014, 08:41:50 AM »

Thoughts,

Bubba is confident the radiator is close to the end of its usefulness.

I still have a binding caliper which I am trying to sort asap.

But driving on country roads and into town its fine not getting hot at all.

As soon as I get onto the motorway its over heating, literally hit 65mpg and cruise and the temp just rises into the red.

Any thoughts.

UKJeeper · « **Reply #1 on:** August 21, 2014, 08:57:14 AM »

Collapsing hoses?

jay140285 · « **Reply #2 on:** August 21, 2014, 08:58:16 AM »

How do I test that, get it up to temp and have someone rev the engine whilst I watch hoses?

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Dave69 · « **Reply #3 on:** August 21, 2014, 10:02:03 AM »

Not enough flow through radiator at higher speeds as an initial thought.
At slow speeds the pump pushes the water around the system and the radiator can cope. At motorway speeds the heat incease from the engine is not being taken away by the radiator, this could be due to it being blocked by silt or rust from the engine block, a coolant flush may help but if the rad is toast then a swap is required. What state is the pump? Vane erosion of the impellas due to cavitation could be a cause of poor flow

jay140285 · « **Reply #4 on:** August 21, 2014, 10:10:48 AM »

How can I see what condition the pump is in. Do u need to physically remove it?

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wildwood · « **Reply #5 on:** August 21, 2014, 10:14:46 AM »

Also check that rad cap is OK , I had loss of fluid thro that as the rubber sealing gasket in the cap had gone hard.
It will be a toasted rad...... I had this on the YJ same symptoms as you. Fins falling off on the inside where you can't see them and build up of mud. Also rust on the inside, just makes it less efficient.

jay140285 · « **Reply #6 on:** August 21, 2014, 10:16:21 AM »

Rad cap is ok, the pressure it was holding in last night confirmed this.

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wildwood · « **Reply #7 on:** August 21, 2014, 10:26:08 AM »

Toasted Rad deffo.

bigjeepzj · « **Reply #8 on:** August 21, 2014, 10:34:15 AM »

The rads Will fill with shit. When I replaced mine it was twice the weight of the old one.

UKJeeper · « **Reply #9 on:** August 21, 2014, 10:35:12 AM »

Have you backflushed it yet?

jay140285 · « **Reply #10 on:** August 21, 2014, 10:40:44 AM »

Kev did a flush and clean rad as best as he could. But reported to me last night he thinks it's on it's last legs and I guess Harptree probably killed it off even more.

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Dave69 · « **Reply #11 on:** August 21, 2014, 10:50:06 AM »

that might be a contributing cause, loss of fins between rad galleries reduces cooling ability. Rads are not really designed to cope with wet mud

pump inspection requires removal = new gaskets on refit

jay140285 · « **Reply #12 on:** August 21, 2014, 10:52:34 AM »

Cool (or not in this case), I will remove rad and replace. I can get an XJ one just not sure it is will fit. Failing that I need to wait till payday but it cuts it fine for CF. I will check pump as well as hoses.

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UKJeeper · « **Reply #13 on:** August 21, 2014, 11:11:56 AM »

Look at the links i posted, In your OTHER rad thread, then look at the pics of XJ rads.

They're not the same.

jay140285 · « **Reply #14 on:** August 21, 2014, 11:35:06 AM »

Yes noticed, thanks Tim. Company card maybe used for the ones you posted mate

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UKJeeper · « **Reply #15 on:** August 21, 2014, 11:47:52 AM »

I went for a 'cheapo' one for the YJ when the original one turned into a sieve. Not had any problems with it.

Link to the ZJ 4.0 rad from the same seller:

http://www.ebay.co.uk/itm/JEEP-GRAND-CHEROKEE-4-0L-1993-1997-RADIATOR-/290849750496?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item43b7fefde0

jay140285 · « **Reply #16 on:** August 21, 2014, 12:18:01 PM »

That looks ideal thanks Tim.

To be honest it does very little miles so should be fine.

YT · « **Reply #17 on:** August 21, 2014, 01:59:19 PM »

That looks a good price, one for my xj was £110 (2 year warranty) couple of years back.

Dave69 · « **Reply #18 on:** August 21, 2014, 03:45:05 PM »

re-core,

should e plenty of places in brum that will recore a rad, might be able to suggest a better option if you tell them what its for and its use

gazjeep · « **Reply #19 on:** August 21, 2014, 07:06:06 PM »

So then post Harptree & all the fun you, Sarah & Bryn had repeatedly playing in liquid chocolate, it seems your rads screwed, young Bryn has had similar & other issues & the auto box on the TJ has had to be re-built due in part to wear & tear but also excessive heat said the nice man as I handed over a cheque for £980

There's a learning point in there somewhere but I cant quite put my finger on it

jay140285 · « **Reply #20 on:** August 21, 2014, 07:19:45 PM »

Errrr I believe Mrs Roberts paid for the TJ work!

I also think they are just random events not related

bgbazz · « **Reply #21 on:** August 21, 2014, 07:23:00 PM »

It will come to you Gaz....probably around about 4am!!

gazjeep · « **Reply #22 on:** August 21, 2014, 07:23:27 PM »

Indeed she has now re-immbersed me

Just coincidence then spunky ?

gazjeep · « **Reply #23 on:** August 21, 2014, 07:24:27 PM »

Quote from: bgbazz on August 21, 2014, 07:23:00 PM

It will come to you Gaz....probably around about 4am!!

Everytime I think I got it, the memsahib throws me another curve ball

jay140285 · « **Reply #24 on:** August 21, 2014, 07:43:21 PM »

Yep just 3 young people enjoying the mud that all happened to have unrelated issues shortly after

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Author Topic: ZJ over heating (Read 6834 times)

jay140285

UKJeeper

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UKJeeper

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jay140285

UKJeeper

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YT

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