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Old 08-18-2019, 10:13 PM   #1
pdiz
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Join Date: Mar 2005
Chapter/Region: SCIC
Location: Riverside, CA
Vehicle:
2005 Baja Turbo
Black Onyx

Default Subaru Baja Turbo overheats with A/C on AND with it off when going up canyons

I know there are many "car overheats with A/C on" threads, but I need to post mine...

2005 Subaru Baja Turbo manual with 137K. Car runs nice and strong in 100-plus degree weather (hot SoCal summers), but when I kick the A/C on, after about 15 minutes, the temp gauge will start to creep up. I immediately shut off the A/C and blast the heater and it goes back to normal temperature. Not sure if it would actually overheat, but why tempt fate?

It also did this when I was driving up a windy canyon road going up a mountain (higher altitude) WITHOUT the A/C on. Again, blasting the heater allowed me to get to my destination as it immediately cooled the engine. But how painful was that ride...

Normal commuting, there are no issues whatsoever, but I don't put the A/C on anymore. In fact, the car pulls like a rally car...

I have since put a Koyo radiator in it and new OEM thermostat and properly burped the system, but that didn't change anything.

After a few months of commuting, I have to replenish the coolant in the radiator overflow tank. I only use Subaru Long Life Coolant. I don't notice any smoking or leaks, but I notice the hoses around this area have a white film on them (undoubted coolant that has dried).

Been living without A/C in the hot California heat for years. I guess it's time to bring it in, but should I go to the dealer or find a Subaru-friendly enthusiast shop? I'm guessing possibly head gasket?

The only mods are, the turbo was going out, so replaced it with an STI turbo, pink fuel injectors, fuel pump, intercooler, etc., but it was doing the "overheating" thing before I had all that done.
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Old 08-18-2019, 11:00 PM   #2
CaptainSlowbaru
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Are the fans coming on?
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Old 08-19-2019, 09:56 AM   #3
pdiz
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Black Onyx

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OEM fans and yes, they both work and kick on at the correct times.
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Old 08-19-2019, 11:45 AM   #4
jasonwrx86
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2018 WRX Limited
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As for hoses that look white, most rubber hoses will change color when exposed to heat. It's the oils in the rubber coming to the surface.

Last edited by jasonwrx86; 08-19-2019 at 11:52 AM.
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Old 08-19-2019, 04:12 PM   #5
Freon-Peon
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AC shouldn't have anything to do with temperature as far as I know. It adds extra load on the engine via the belt drive but that's the only effect you should ever see.
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Old 08-19-2019, 04:36 PM   #6
jasonwrx86
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Quote:
Originally Posted by Freon-Peon View Post
AC shouldn't have anything to do with temperature as far as I know. It adds extra load on the engine via the belt drive but that's the only effect you should ever see.
The condenser does create a lot of heat when running which is in front of the radiator. It can affect the temperature of the radiator.
I wonder if the condenser is clogged up or something so air is not flowing though?
Overtime these small fins can get plugged up and not allow air to flow through.
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