Valk1520 Posted January 25, 2010 Share Posted January 25, 2010 I recently purchase 93 LS400 with 91,000 miles super clean car and I love it, but I noticed that the coolant tank was a small amount low when I purchased the car. I topped it off and after about 2000 miles I noticed it is down about the same amount as before filling. I haven’t' noticed any leaks. I did check the oil and don't see any signs of anti-freeze but then again I don't know if I would notice anything considering the color of the red fluid that is unseeded in theme’s cars. I really love this car but this is bumming me out considering I just got it a month ago. Any help in diagnosing would be great. Quote Link to comment Share on other sites More sharing options...
RDM Posted January 25, 2010 Share Posted January 25, 2010 Shine a flashlight down under the intake manifold into the valley between the cylinder heads. Look for coolant there. There's a crossover pipe that exits the back of the water pump and travels to the rear of the engine, then into the heater core. It's sealed at the front with just a rubber o-ring that can easily wear and begin leaking. I just replaced mine after a few months of it lightly leaking then finally dumping a gallon on a cold day. Quote Link to comment Share on other sites More sharing options...
Valk1520 Posted January 25, 2010 Author Share Posted January 25, 2010 I did that this am and nothing there. Thanks. Quote Link to comment Share on other sites More sharing options...
curiousB Posted January 25, 2010 Share Posted January 25, 2010 I recently purchase 93 LS400 with 91,000 miles super clean car and I love it, but I noticed that the coolant tank was a small amount low when I purchased the car.I topped it off and after about 2000 miles I noticed it is down about the same amount as before filling. I haven’t' noticed any leaks. I did check the oil and don't see any signs of anti-freeze but then again I don't know if I would notice anything considering the color of the red fluid that is unseeded in theme’s cars. I really love this car but this is bumming me out considering I just got it a month ago. Any help in diagnosing would be great. I have a Lincoln Aviator (big Ford V8) that was losing coolant but I couldn't find the leak. Turned out to be a failed head gasket. I haven't seen many complaints of this type of failure on this Lexus forum but I guess it is something to check. The test to make the final determination was a cylinder leak down test (used instead of a straight compression test). So maybe you should have one of those done to either confirm or rule out that possibility. Quote Link to comment Share on other sites More sharing options...
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