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90 cherokee overheating problems help!!

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Old Mar 25, 2021 | 08:43 AM
  #31  
frank.longo86's Avatar
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From: NY
Year: 1990 w/ 52k original
Model: Cherokee (XJ)
Engine: 4.0 BaNgeRs
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when i first turn it on it takes a little while for it to get warm its not within seconds but when it gets to the half point it goes up pretty quick.. its at idle haven't put it on the road yet i just bought it and it needs a few things.

the blower keeps blowing a fuse is it absolutely necessary to have that going i guess is the better question? thats why i been cracking the sensor in the back, if so im sure the resistor or the blower itself is shot i can re-gear towards fixing that real quick and do what you suggested.

overheating and the blower are my 2 issues. for gods sake it only has 47k on it im not expecting a mess of problems, but who knows.

i do have another thermostat in case the one i bought was faulty.
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Old Mar 25, 2021 | 09:25 AM
  #32  
cruiser54's Avatar
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From: Prescott, Az
Year: 1990
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Engine: 4.0
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Use a factory stat. MOPAR only.

I have a confession to make. I have never bled a Renix cooling system........correct stat and a properly sealing expansion bottle and you're good to go.
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Old Mar 25, 2021 | 09:44 AM
  #33  
frank.longo86's Avatar
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From: NY
Year: 1990 w/ 52k original
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Engine: 4.0 BaNgeRs
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lol i have that too. i'll do both. cant find a Mopar one already tried. but when i do i'll buy one thats a fact
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Old Mar 25, 2021 | 10:20 AM
  #34  
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From: Southern Texas (former AZ & Aus)
Year: 1999
Model: Cherokee(XJ)
Engine: I6 4.0L
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Originally Posted by Chick-N-Picker
Can you describe when it over heats? Does it over heat very quickly? Or does it take a while? Is it at idle or when driving?

I'd change the T-Stat again and not drill holes. The closed system is a bit harder to get the air out and I am glad I changed to the open system, but it is possible to get the air out with out loosening any sensors and such. I did it plenty and plenty of times. Make sure your T-Stat is 195 and don't get the dirt cheap one. Go at least mid level. Mopar is certainly the best.

Once you do change the T-Stat again and know you have the air out of it then....oh.....make sure your heater is on and on high when filling with water/coolant. That will cause air to get trapped if it's not on.

And clean your grounds...those can cause overheating if they are not clean......

@cruiser54
good point on that one.... easy to forget making sure the heater is on when doing this process if you're not methodical about it.
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Old Mar 25, 2021 | 03:29 PM
  #35  
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From: Prescott, Az
Year: 1990
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Engine: 4.0
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Originally Posted by frank.longo86
lol i have that too. i'll do both. cant find a Mopar one already tried. but when i do i'll buy one thats a fact
https://www.moparpartsgiant.com/part...3501426ac.html
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Old Mar 25, 2021 | 07:31 PM
  #36  
frank.longo86's Avatar
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From: NY
Year: 1990 w/ 52k original
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Engine: 4.0 BaNgeRs
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You're never going to believe this I said there's no way this truck is shot I look at the motor the two f****** hoses were reversed switched those suckers around now its

Thats one happy jeep lol
perfect I appreciate all the love it is much much appreciated
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Old Mar 25, 2021 | 07:31 PM
  #37  
cruiser54's Avatar
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From: Prescott, Az
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Which hoses?
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Old Mar 25, 2021 | 10:43 PM
  #38  
frank.longo86's Avatar
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From: NY
Year: 1990 w/ 52k original
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Engine: 4.0 BaNgeRs
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I had the heater core hose going into the thermostat an the hose coming from the resevoir going into the heater core side those are the two little ones to the left and right of the big fat one that comes over the top of the thermostat housing it was reverse flowing everything that's why nothing was cooling down I felt like such an ***
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Old Mar 25, 2021 | 10:46 PM
  #39  
frank.longo86's Avatar
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From: NY
Year: 1990 w/ 52k original
Model: Cherokee (XJ)
Engine: 4.0 BaNgeRs
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I had the heater core hose going into the thermostat an the hose coming from the resevoir going into the heater core side those are the two little ones to the left and right of the big fat one that comes over the top of the thermostat housing it was reverse flowing everything that's why nothing was cooling down I felt like such an ***
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Old Mar 26, 2021 | 05:56 AM
  #40  
cruiser54's Avatar
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From: Prescott, Az
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That's a new one on me....glad it's fixed!
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Old Mar 30, 2021 | 10:25 AM
  #41  
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From: NY
Year: 1990 w/ 52k original
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Engine: 4.0 BaNgeRs
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Originally Posted by cruiser54
That's a new one on me....glad it's fixed!
tell me about it. i moved on to the blower motor issue now. one step at a time there's a few things on here that are old as hell lol.. i took this thing out it was rusted closed smh
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