MEDO Posted January 8, 2011 Share Posted January 8, 2011 Dears My Lexus LS400-1990 is very slow warming-up. The cooling fan is start immediately with starting engine. And fuel consumption is abnormal (too much). Also the RPM is about 1600 until warming. Is that normal? What is the reason? Quote Link to comment Share on other sites More sharing options...
smooth1 Posted January 8, 2011 Share Posted January 8, 2011 stuck thermastat, in the wide open position. Quote Link to comment Share on other sites More sharing options...
MEDO Posted January 12, 2011 Author Share Posted January 12, 2011 Indeed, I was have the same problem (slow warm up) Need more than 20 minutes .. I tried to put piece of cardboard in front of radiator to minimize air quantity blowing by main mechanical fan .. Also I checked the Thermostat, by put it in a boiling water, (its opened with no problem..and its closed when put it in cold water). But I observed a very small piece of the rubber ring is broken, and when Thermostat closed at cold state, its remaining to leaks some water through the closed gate, just I removed all that rubber ring and that makes the gate closing completely .. Then I return it back in its hose .. Its work ... Now I need about 6 minutes only to warm up to the normal state and return the RPM to 800 from 1400. Quote Link to comment Share on other sites More sharing options...
smooth1 Posted April 19, 2011 Share Posted April 19, 2011 Your welcome. Quote Link to comment Share on other sites More sharing options...
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