Overheating and leaking when A/C is on

[BUFFY2]

Hello ,
I am new to the site even though I look at the discussions quite often.
I need help on what to do with my 1999 Jeep Wrangler Sahara 6 cyl.
I have had the jeep 8 years with only a radiator and thermostat replacement when I first bought it.
I have not had any problems with the jeep what so ever except for my airbag light came on and just never fixed it.

I was driving to work with the a/c on( I did notice it wasn't as cold as it usually gets) and the check gauges light came on and I immediately pulled over for all my coolant to spill on the ground. I let it cool off and put coolant back in it to drive it home 45 mins without a/c on and it did fine.

I noticed it had a leak in the radiator and so ordered all parts to replace coolant system.

I didn't know to buy all mopar parts so this is what I replaced.

Motorad 195 Thermostat with weep hole

DAYCO wATER PUMP

Thermostat housing

liland Global oe quality all aluminum radiator.

After replacing all of this and adding new coolant, It did the exact same thing. Overheated and coolant spilled everywhere just like before( only when a/c is on).
I did not burp the system and I did not flush the system as it looked very clean( but maybe hind sight I should have)

Oil is clean, no coolant there.

Can someone help redirect me before I loose my mind.

 

[macleanflood]

Here's the tried and true guide...

Thread 'Jeep Wrangler TJ Cooling System Overhaul FAQ'

Jan 23, 2017

Should I replace my entire cooling system at once?
It's a wise thing to do, yes. Let's say you buy a used Jeep Wrangler TJ with 100k plus miles on it. Well, first and foremost you have to know that as I'm writing this in 2017, your vehicle is anywhere between 20 years old (if it was made in 1997) to 11 years old (if it was made in 2006). Either way, if you have no record of the cooling system having been replaced, then you're on your stock cooling system, and even if the miles are lower, that's still a lot of time for a cooling system. Plastic and rubber wear out over time, as...

• Chris
• Replies: 331
• Forum: TJ Resources

• 

You're not going to find much love for that aluminum radiator. General consensus is Denso.

I'd start with a Thermocure flush and see what that gets you.

There are dozens of posts on this very topic...if not hundreds.

-Mac

 

[Rubiconned]

Contrary to popular myth aluminum radiators are inferior to a copper/brass equivalent due to thermal conductivity differences of the two metals.

 

[JKP]

Put a new 18 lb radiator cap on it before you do anything else.

 

[TJ4Jim]

Here's the tried and true guide...

Thread 'Jeep Wrangler TJ Cooling System Overhaul FAQ'

Jan 23, 2017

Should I replace my entire cooling system at once?
It's a wise thing to do, yes. Let's say you buy a used Jeep Wrangler TJ with 100k plus miles on it. Well, first and foremost you have to know that as I'm writing this in 2017, your vehicle is anywhere between 20 years old (if it was made in 1997) to 11 years old (if it was made in 2006). Either way, if you have no record of the cooling system having been replaced, then you're on your stock cooling system, and even if the miles are lower, that's still a lot of time for a cooling system. Plastic and rubber wear out over time, as...

• Chris
• Replies: 331
• Forum: TJ Resources

• 

You're not going to find much love for that aluminum radiator. General consensus is Denso.

I'd start with a Thermocure flush and see what that gets you.

There are dozens of posts on this very topic...if not hundreds.

-Mac

Interestingly my son installed a new Denso rad last August (during resto) and has been experiencing temperature issues since, then 2 weeks ago she overheated (in our typical low temps) and puked w/o the AC on. New pump, cap and stat was no change so for giggles we hit up O'Reilly's for a cheapo rad and she has been a steady 195 since. Still not sure what the issue was with the rad.

 

[macleanflood]

New parts are all shit these days. It's really hard to say one brand or another is a panacea. Generally speaking Denso has been highly regarded. I have a Napa sourced Spectra radiator on my 97... allegedly installed by my PO. If I was to have radiator issues I'd be installing a Denso from Rock Auto.

I've already replaced my water pump with a Napa sourced Gates. Did that preemptively when I replaced my timing chain. I also replaced my thermostat neck and thermostat with a Robert Shaw sourced from Flow Kooler.

I've had so much coolant in and out of my Jeep I've not bothered with a flush.

But I have zero overheating issues. I did have a under heating issue... thermostat was keeping the Jeep too cool. PCM was richening up the mixture to compensate and my gas mileage dropped to the 8s.

-Mac

 

[Baragi]

Ciao ,
Sono nuovo del sito anche se seguo le discussioni abbastanza spesso.
Ho bisogno di aiuto su cosa fare con la mia Jeep Wrangler Sahara 6 cilindri del 1999.
Ho avuto la Jeep per 8 anni e quando l'ho acquistata ho dovuto sostituire solo il radiatore e il termostato.
Non ho avuto nessun problema con la jeep, a parte l'accensione della spia dell'airbag che non ho mai riparato.

Stavo guidando verso il lavoro con l'aria condizionata accesa (ho notato che non faceva freddo come di solito) e la spia di controllo degli indicatori si è accesa e mi sono subito fermato per far rovesciare tutto il liquido refrigerante a terra. L'ho lasciata raffreddare e ho rimesso il liquido refrigerante per guidare fino a casa per 45 minuti senza aria condizionata accesa e ha funzionato bene.

Ho notato che c'era una perdita nel radiatore e quindi ho ordinato tutti i pezzi per sostituire il sistema di raffreddamento.

Non sapevo di dover acquistare tutti i pezzi Mopar, quindi ho sostituito questi.

Termostato Motorad 195 con foro di spurgo

POMPA DELL'ACQUA DAYCO

Alloggiamento del termostato

Radiatore interamente in alluminio di qualità OE globale Liland.

Dopo aver sostituito tutto questo e aggiunto nuovo refrigerante, ha fatto esattamente la stessa cosa. Surriscaldamento e refrigerante versato ovunque proprio come prima (solo quando l'aria condizionata è accesa).
Non ho fatto ruttare il sistema e non l'ho lavato perché sembrava molto pulito (ma forse a posteriori avrei dovuto farlo)

L'olio è pulito, non c'è refrigerante.

Qualcuno può aiutarmi a rimettermi in carreggiata prima che perda la testa?

Ciao sono nuovo nel forum e sono alla ricerca della tua stessa soluzione, non ho mai sostituito nulla dell'impianto refrigerante, ma ora solo con il condizionatore inserito si alza la temperatura e va in ebollizione, come spengo il clima torna a regime.
in oltre non sopporto che quando la spengo, la ventola si fermi e il calore resta tutto sotto al cofano.
se qualcuno mi può indicare i post già discussi le sarei grato.
grazie.

 

[BUFFY2]

Here's the tried and true guide...

Thread 'Jeep Wrangler TJ Cooling System Overhaul FAQ'

Jan 23, 2017

Should I replace my entire cooling system at once?
It's a wise thing to do, yes. Let's say you buy a used Jeep Wrangler TJ with 100k plus miles on it. Well, first and foremost you have to know that as I'm writing this in 2017, your vehicle is anywhere between 20 years old (if it was made in 1997) to 11 years old (if it was made in 2006). Either way, if you have no record of the cooling system having been replaced, then you're on your stock cooling system, and even if the miles are lower, that's still a lot of time for a cooling system. Plastic and rubber wear out over time, as...

• Chris
• Replies: 331
• Forum: TJ Resources

• 

You're not going to find much love for that aluminum radiator. General consensus is Denso.

I'd start with a Thermocure flush and see what that gets you.

There are dozens of posts on this very topic...if not hundreds.

-Mac

Thank you I will start there, I looked at most of the overheating issues in the forums but not really specific to only when a/c if running. Wasn't sure about that.

 

[macleanflood]

Thank you I will start there, I looked at most of the overheating issues in the forums but not really specific to only when a/c if running. Wasn't sure about that.

AC will definitely put another 10-20 degrees of additional temperature into the system. Shouldn't overheat. But it won't be the standard 212ish.

-Mac

 

[BUFFY2]

New parts are all shit these days. It's really hard to say one brand or another is a panacea. Generally speaking Denso has been highly regarded. I have a Napa sourced Spectra radiator on my 97... allegedly installed by my PO. If I was to have radiator issues I'd be installing a Denso from Rock Auto.

I've already replaced my water pump with a Napa sourced Gates. Did that preemptively when I replaced my timing chain. I also replaced my thermostat neck and thermostat with a Robert Shaw sourced from Flow Kooler.

I've had so much coolant in and out of my Jeep I've not bothered with a flush.

But I have zero overheating issues. I did have a under heating issue... thermostat was keeping the Jeep too cool. PCM was richening up the mixture to compensate and my gas mileage dropped to the 8s.

-Mac

Is there a way to tell if any of my new parts are bad from the get go? Like the water pump how would I know if it is working correctly?

 

[macleanflood]

Ciao sono nuovo nel forum e sono alla ricerca della tua stessa soluzione, non ho mai sostituito nulla dell'impianto refrigerante, ma ora solo con il condizionatore inserito si alza la temperatura e va in ebollizione, come spengo il clima torna a regime.
in oltre non sopporto che quando la spengo, la ventola si fermi e il calore resta tutto sotto al cofano.
se qualcuno mi può indicare i post già discussi le sarei grato.
grazie.

Higher temperatures with AC running are normal.

If you don't want your fan to shut off with the engine you can switch to an electric. I believe some folks have reported success with Ford Explorer electric fans.

I'm happy with a working stock cooling system.

-Mac

 

[BUFFY2]

Contrary to popular myth aluminum radiators are inferior to a copper/brass equivalent due to thermal conductivity differences of the two metals.

Hi, I'm new to the forum and I'm looking for the same solution as you, I've never replaced anything in the cooling system, but now only with the air conditioning on does the temperature rise and boil, as soon as I turn off the air conditioning it goes back to normal.
I also can't stand the fact that when I turn it off, the fan stops and all the heat stays under the hood.
If anyone can point me to the posts already discussed I would be grateful.
Thank you.

keep me up to date if you find anything that helps also.

 

[macleanflood]

Is there a way to tell if any of my new parts are bad from the get go? Like the water pump how would I know if it is working correctly?

Water pump is "easy." Starting from a cold start...pop your radiator cap. Start the Jeep. As it gets close to 195 degrees you should see water circulating or stirring.

If you see water circulating before 195 degrees then you have a bad thermostat.

A lot of cheap water pumps impellers disintegrate quickly. Those are the tricky ones...you need to look at circulating water...the easy ones are the bearing failures. You can hear those.

 

[Baragi]

È normale che si verifichino temperature più elevate con l'aria condizionata in funzione.

Se non vuoi che la ventola si spenga insieme al motore, puoi passare a una elettrica. Credo che alcune persone abbiano segnalato di aver avuto successo con le ventole elettriche della Ford Explorer.

Sono soddisfatto del sistema di raffreddamento di serie funzionante.

-Mac

Grazie ne terrò conto devo trovare il perché si alza con l'aria condizionata
e va in ebolluzione.

 

[JKP]

Is there a way to tell if any of my new parts are bad from the get go? Like the water pump how would I know if it is working correctly?

If you didn't burp all the air out, you can have issues with the temp spiking on the gauge.

If you didn't replace the radiator cap, a weak one will not hold the correct pressure and allow the coolant to boil over.

If you remove the cap and let it run you will see the coolant circulate, any air pockets will burp out as it runs. This will splash coolant out, so don't stand right over it.

 

[macleanflood]

Grazie ne terrò conto devo trovare il perché si alza con l'aria condizionata
e va in ebolluzione.

As mentioned it could be your cap not holding pressure.

-Mac

 

[SRCustom]

Did you replace the fan clutch? If you replaced all that other stuff and left a faulty fan clutch in place, you'd still get a boil-over...

 

[BUFFY2]

Did you replace the fan clutch? If you replaced all that other stuff and left a faulty fan clutch in place, you'd still get a boil-over...

View attachment 554122

I bought a fan clutch but realized i Have an electric fan when I started taking it apart . I ran it last night with the flush in there and it overheated without the ac on. Took it about 8 miles. It was at a constant 210 and then straight to overheated. Had to tow it back home.

 

[macleanflood]

Interesting...wonder what electric fan setup someone installed.

Might want to consider switching back to the factory fan.

What's your fan shroud look like?

-Mac

 

[Rubiconned]

I bought a fan clutch but realized i Have an electric fan when I started taking it apart . I ran it last night with the flush in there and it overheated without the ac on. Took it about 8 miles. It was at a constant 210 and then straight to overheated. Had to tow it back home.

So, now it's overheating without the ac on? Obviously it has nothing to do with the ac. You also said the radiator thermostat is 8 years old. I'd replace it. Also, make sure you visually see that your electric fan comes on during parked idle. I once had a Mustang in which I installed an electric fan and the thermostat would stick on "off" intermittently. I replaced the fan's thermostat and problem solved.