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Heater problems Toyota Rav4

Heater works when outside temp is 20 and up but is poor when it is colder. Replaced thermostat, flushed everything. Checked all the controls and such, looks good. after 30 min of driving this am still just warm heat, got out and felt upper and lower rad hoses, bottom was cold, top was warm but not hot, somethings not right. Temp guage shows about half within 10 min of driving but does not seem to be telling the truth. It will eventually warm up but takes a long time. Acts like there is no thermostat bu there is, it is new. The new one seems to work no differant than the old one. HELP<


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