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Old 05-06-2022, 08:52 PM   #1
AngelBugeye
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Join Date: Apr 2022
Default Overheating uphill issue

Hi guys.. so I have a Wrx 03
No big mods..

Sti intercooler
Sti injectors
Vf48 turbo
Walbro 255 FuelPump
Uppipe STI

Stage one tune

Previous owner had the car running with straight distilled water (maybe with water wetter.. not sure)

I decided to change it from water to coolant.. some days after, car started to overheat when going uphill

I thought it was the thermostat and waterpump
Yesterday I Did the timing belt kit replacement with new oem waterpump and oem thermostat as well

Went for a drive and still overheating uphill..

I replaced rad caps, waterpump and thermostat..

Im between the radiator or the HG
Not sure what to thinkÖ. Car is not leaking , hoses are fine and oil dipstick looks clean.. no white smoke, no stalling, no rough idle..

Any ideas???


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Last edited by AngelBugeye; 05-06-2022 at 09:24 PM.
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Old 05-06-2022, 11:18 PM   #2
D-Rodman
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Air in the system possibly.


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Old 05-07-2022, 01:46 AM   #3
benflynn
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Overheating uphill is a capacity issue. So, either not full of water, or rad is dirty or rad too small
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Old 05-07-2022, 12:18 PM   #4
03,2.0Ljapwagon
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Location: SLC, UT
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Did the water have any gunk in it when you drained it? I can agree with Rodman, Subaru's seem to be pretty finicky when it comes to air in the system. My car was overheating b/c of the same thing. Turns out I was doing it all wrong.
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Old 05-07-2022, 02:21 PM   #5
AngelBugeye
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Default Overheating uphill issue

Quote:
Originally Posted by 03,2.0Ljapwagon View Post
Did the water have any gunk in it when you drained it? I can agree with Rodman, Subaru's seem to be pretty finicky when it comes to air in the system. My car was overheating b/c of the same thing. Turns out I was doing it all wrong.


Water came out pretty clean.. coolant looks pretty decent

But the water pump was corroded as hell.. it had a lot of calcium like deposits. So i wouldnt be surprised if there is some left in the radiator

Im getting a new radiator on monday.. lets see how it goes


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Old 05-07-2022, 06:21 PM   #6
03,2.0Ljapwagon
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Quote:
Originally Posted by AngelBugeye View Post
Water came out pretty clean.. coolant looks pretty decent

But the water pump was corroded as hell.. it had a lot of calcium-like deposits. So I wouldn't be surprised if there is some left in the radiator

I'm getting a new radiator on Monday.. let's see how it goes


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Oh, okay. It's probably a good thing to change the radiator out anyways. Last time I took mine out it was filled with a bunch of random gooey crap. I think the last owner put some conditioner in there to seal up leaks. What radiator did you purchase?
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Old 05-07-2022, 07:43 PM   #7
benflynn
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A coolant filter kit for a 7.3 turbo diesel will clean the cooling system in less than a month. I have had them so bad no number of flushes would clean it out, next day it would always be muddy water in there. Coolant filter cleared it right up. Iím a believer.
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Old 05-08-2022, 07:04 PM   #8
AngelBugeye
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Quote:
Originally Posted by 03,2.0Ljapwagon View Post
Oh, okay. It's probably a good thing to change the radiator out anyways. Last time I took mine out it was filled with a bunch of random gooey crap. I think the last owner put some conditioner in there to seal up leaks. What radiator did you purchase?


A friend had an extra stock oem radiator.. heís gonna give it to me tomorrow to see if a new radiator solves the problem..

Planning on buying a koyo or mishimoto in the near future. But right now, i just wanna find out the root of this overheating problem


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Old 05-09-2022, 09:45 AM   #9
03,2.0Ljapwagon
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Quote:
Originally Posted by AngelBugeye View Post
A friend had an extra stock oem radiator.. heís gonna give it to me tomorrow to see if a new radiator solves the problem..

Planning on buying a koyo or mishimoto in the near future. But right now, i just wanna find out the root of this overheating problem


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Good, let us know if anything changes!
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Old 05-10-2022, 04:54 PM   #10
AngelBugeye
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Default Overheating uphill issue

Quote:
Originally Posted by 03,2.0Ljapwagon View Post
Good, let us know if anything changes!


Quick update guys! So I got my friends radiator (slightly used) yesterday and I put it..

Went for a drive.. and temperature is finally behaving the way it should be! Thankfully it was the radiator. Anyways, Iíll keep an eye on it but yeah, problem solved

Thank you guys for your inputs


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Old 05-16-2022, 07:48 PM   #11
monkeyposeur
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A Lisle funnel is a good investment to ensure you don't have any air in the system anytime you are messing with the radiator or coolant system.
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Old 05-21-2022, 09:00 PM   #12
AngelBugeye
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Quote:
Originally Posted by monkeyposeur View Post
A Lisle funnel is a good investment to ensure you don't have any air in the system anytime you are messing with the radiator or coolant system.


^^


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