spazzy67 Posted December 3, 2009 Share Posted December 3, 2009 Hi All! My heater takes forever to heat up. I changed the thermostat and made sure my coolant is not leaking or blowing any white smoke out the exhaust, but I keep having to top off the overflow bottle. The weird thing is , it seems to heat up faster at higher speeds , then gets cooler as I aproach a signal or get off the expressway! What could be causing this & what else should I checke or test for furthur analysis. Where is the anti-freeze going??? The top and bottom hoses both get hot. Thanks in advance for your response! Paul B) Quote Link to comment Share on other sites More sharing options...
4howard Posted December 3, 2009 Share Posted December 3, 2009 I have had a similar problem for about four years on my 1995 LS400. When idling, or stop and go traffic, i get cold air. When I increase to highway speed, the air will gradually warm up and supply satisfactory heat. After a $2000 trip to the Lexus dealer, the problem was solved for a few weeks. They claimed "my local service station" filled the cooling system with the wrong type of coolant. When I returned with the same problem two weeks later, they told me there was air in the system and that it had to be "burped". The dealer described a procedure where they raised the front of the car in order to force the air out of the system. Winter ended, the problem returned the next season. Each fall I bring the car to my local service station to bleed and burp the system as described by the Lexus dealer. The fix usually lasts a few weeks. I have never heard what the problem is caused by. :( Quote Link to comment Share on other sites More sharing options...
landar Posted December 3, 2009 Share Posted December 3, 2009 Replace the radiator(reservoir) cap. Quote Link to comment Share on other sites More sharing options...
spazzy67 Posted December 6, 2009 Author Share Posted December 6, 2009 Replace the radiator(reservoir) cap. Is this because its not properly sealed so its sucking air? Quote Link to comment Share on other sites More sharing options...
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