Lexus RX400h Questions

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my car before three weeks didn't work and i changed the small battery and when i starting to operate my car READY word appear just for seconds then hided and the engine off and not starting.
When i test the car by the hybrid testing device the electrician told me to replace the hybrid battery.
I want to know if my hybrid battery still in the warranty time.
thanks very much.
Last couple months a couple times I had heat on and noticed cool air blowing out. Today heat went on then went cool pretty quickly and sporadically went back to heat. Dealer said coolant leading from radiator and to replace it including hoses is $1250. Thermostat is $600.
While driving the heater works only when the engine is running. What would cause this problem?
Put in key press brake turn key, and no ready light. Leave come back ready light comes on . no problem. This is after about 1 to 2 hours.
When I put the temperature at say 75, warm air comes out initially; but soon it only blows cool air. The dealer said that's the way it works.
What seems to make the problem better or worse? Worse if it's cold outside but never gets better
How long have you had this problem? Years
I have to replace my 120 amp alternator fuse but is bolted inside the fuse box
How many more miles can I reasonably expect from the battery?
What maintenance is needed for my AWD hybrid Lexus SUV? At 106 k miles?
My schedule maintenance log shows at 60,000 miles to Replace engine oil & oil filter, reset reminder light, rotate tires, visually inspect brake pads & rotors & road test vehicles.

The additional maintenance required is if u drive on dirt or dusty roads. I do not.

Yet when I call shops to get estimates-they include the additional maintenance.
When the car is locked up and outside, all the doors and sun roof open up if it rains. This has only happened at night, but that might be coincidence. I think it has to do with the rain. Is there a water sensor that affects the doors?
problem happens daily.
Radio comes on but has no volume and had to replace the 12 volt battery
dealer says front motor mount is soft and dogbone should be replaced, it this common with only 82,000 miles.
Car runs little while then shuts off
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