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Old 7th March 2009
saabguy#3 saabguy#3 is offline
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Default Help with cooling system

Hi everyone I have a 99 9-5 v6 with 100,000 miles on it and I am trying to figure out why the car seems to enjoy eating oil coolers at a rate of one every 13 to 14 months over a 4 year period. Each time the repairs are done by my indy and have not been covered my warranty. During the months in between when the car is performing fine I sometimes will get the fill coolant light even though the fluid level is ok. Also even more infrequently when I turn the car on after it has already been up to temp the temp gaudge it at the 11 oclock position but drops right after about 5 sec after start up. So now my car sits in the yard at work with oil in the coolant and a small puddle of coolant under the car, I think the oil ate through a hose. Can anyone advise me as to what else is the issue here and also I heard that the Cadillac catera shares the same motor as my car and that the oil cooler is made of steel and is less likely to crack like the aluminum cooler in the saab. Any help with this will be very appreciated.....Thank you!!
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  #2  
Old 7th March 2009
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Al's Red Wagon Al's Red Wagon is offline
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The only thing I can think of is the dexcool problem... but I don't think that happens over the course of a year
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Old 7th March 2009
Still Pete67... Still Pete67... is offline
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I've never heard of a car going through this many oil coolers,did you ever get to see the ones that were taken out?
All the G.M. units are stainless now,so the last few that were replaced should have lasted the life of the engine,this job is a pain to do yourself but can be done with a basic tool kit over a weekend.

The low coolent message might be the sender unit in the expansion tank on the way out.
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Old 7th March 2009
saabguy#3 saabguy#3 is offline
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I have seen the failed coolers and they dont too bad, I am not sure what should I look for but they look like they have been sitting in oil and coolant. They were never pressure tested so as to way exactly they have failed is unknown. But I need to figure out why I keep going through them. I think I might do it myself I just gotta make the time.
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Old 7th March 2009
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toxicavenger toxicavenger is offline
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Sounds like you might have a issue with your thermostat or temp sender. So I would replace both of them. Because if one of them isn't working correctly then it could be causing the engine to have to much pressure or overheat. Sounds like the Indy should have tried to see what is causing the issue after the second one was put in. good luck bro.
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