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2004 Saab 93 low coolant

I replaced the oil cooler and then about a month later, the low coolant light appeared again and sure enough it registers low in the resavior. The car has never overheated or registered high. What do I do now? Thanks

Put more coolant in. Continue to monitor the loss. A few pints in a month is not heavy enough to show a significant leak.

Add coolant to the correct level and monitor it. Can you see a leak anywhere? Are there any spots on the ground under the car?