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Welcome to Saab92x.com!
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Hey All, I've been having an overheating problem as of late.
It started 2 weeks ago when the lower radiator hose blew off the radiator (clamp not tight enough?) resulting in my driving it in the red for not sure how long. My guess would be for about 5 minutes. I wish they had some sort of light to warn for high engine temps!
I filled the coolant back up and went back on my merry way of driving with normal engine temps until yesterday.
Drove on the highway for an hour sitting in traffic to go biking and stop to get gas. Temp is fine. Get back in the car and drive 5 minutes and I notice the temp has gone up to 3/4. I pull over, run the heater, and notice all my coolant is in the overflow bottle. Bubbling pretty good. No heat in the cabin, no coolant circulating in the system. Let her cool down and refill the system and drive home another 45 minutes of smooth highway driving without a problem. Overflow reservoir is empty.
At this point I jump on the forums and pretty much assumed that my headgasket had an internal leak somewhere from when I had overheated it 2 weeks prior. Today I replaced my thermostat (pre planned) and gave it a good hard drive around town to see if I could replicate the results, block leak tester in hand. Engine runs at normal temps so I pull over to check the coolant and its maybe 2 inches from the top of the overflow tank (see pictures below) with some slight bubbling. Maybe one 1/2" bubble every 1 second. I throw the block leak tester in there and pull some of the fumes. Fluid color doesnt seem to change, maybe a tiny bit more green. I keep at it and still no drastic color change (see pictures below).
I've pretty much already written this off as a headgasket problem but the leak test really confused me. Any input??
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Also, not sure if this is worth noting but it seemed like there was a lot of pressure in the radiator hoses when the engine was warmed up. It was very difficult to squeeze them, if possible at all.
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Check if your radiator cap is still good. A bad radiator cap can cause most of the things you listed.
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This isn't exactly related but... I just replaced my radiator and everything went fine and I'm trying to bleed the system of air and it just keeps on coming out and the temperature gets to about three quarters on my gauge and sits there. The air bubbles just do not seem to end. I have heat cycled it about seven or eight times already. Anyone have advice as to what the problem could be or do I just need to keep doing this until the air stops?
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slinky8476 wrote:
This isn't exactly related but... I just replaced my radiator and everything went fine and I'm trying to bleed the system of air and it just keeps on coming out and the temperature gets to about three quarters on my gauge and sits there. The air bubbles just do not seem to end. I have heat cycled it about seven or eight times already. Anyone have advice as to what the problem could be or do I just need to keep doing this until the air stops?
Have you tried squeezing the top radiator hose? Just squeeze it and release it until all the air bubbles come out the coolant reservoir. That should help burp the system a little faster.
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slinky8476 wrote:
This isn't exactly related but... I just replaced my radiator and everything went fine and I'm trying to bleed the system of air and it just keeps on coming out and the temperature gets to about three quarters on my gauge and sits there. The air bubbles just do not seem to end. I have heat cycled it about seven or eight times already. Anyone have advice as to what the problem could be or do I just need to keep doing this until the air stops?
Did you open the cap at to the left front of the turbo?
Last edited by WDEagle (2015-08-17 22:39:53)
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Yeah I have squeezed the upper radiator hose a few times and gotten more air out. I have also opened the cap to the reservoir near the turbo and added coolant there. I don't see any bubbles coming out of that reservoir.
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slinky8476 wrote:
Yeah I have squeezed the upper radiator hose a few times and gotten more air out. I have also opened the cap to the reservoir near the turbo and added coolant there. I don't see any bubbles coming out of that reservoir.
If there are no bubbles and you have the reservoir filled to the top, it sounds like you have the system burped. Maybe it's something else? Why did you replace your radiator?
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Radiator had typical crack.
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The timing belt and water pump and thermostat we're all just done less than 5000 miles ago. The only thing I am slightly confused about with this whole deal is the radiator that I bought at Napa has the connections for the automatic transmission cooler lines. I asked them about this quite a bit and they assured me that the aftermarket manufacturers have just made one radiator for both applications these days. The unit on the bottom that has the connections for the automatic transmission seems to be self-contained so I didn't think it would be an issue. Could this possibly be what is introducing hair to my system?
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slinky8476 wrote:
I asked them about this quite a bit and they assured me that the aftermarket manufacturers have just made one radiator for both applications these days. The unit on the bottom that has the connections for the automatic transmission seems to be self-contained so I didn't think it would be an issue. Could this possibly be what is introducing hair to my system?
I have the same NAPA radiator in my car. I can't tell you if the AT cooler will introduce hair to your system, but it shouldn't allow air into the cooling system.
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I really feel for Slinky, I really do, but Tonka that was hilarious. I saw that one coming 
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That's what I get for using speech to text. Update on the situation: I seem to have gotten the air out of my system now and my temperature is stabilized where it should be. However on my test drive it seems that I am now driving a linear, because my turbo appears to be non-existent.
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slinky8476 wrote:
That's what I get for using speech to text. Update on the situation: I seem to have gotten the air out of my system now and my temperature is stabilized where it should be. However on my test drive it seems that I am now driving a linear, because my turbo appears to be non-existent.
I posted the same thing here once before. Radiator hose sprung a leak and car got hot. I replaced the hose and coolant and test drove it. Car seemed like it did not have a turbo anymore.
https://saab92x.com/viewtopic.php?id=35390
Hopefully you will experience the same thing.
Last edited by WDEagle (2015-08-18 11:00:21)
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Got everything back to normal by just continuing to burp air out of the system. 
Can't believe it took that many times. Thanks for your help guys.
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Alright. I pressure tested the cooling system and found it slowly pressurized to around 12psi before I shut it off. Looks like it's headgasket time...
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