LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

A/c + Fuel Consumption LS400 95

Old 05-27-14, 08:50 PM
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mjfuture
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Default A/c + Fuel Consumption LS400 95

Greeting all,

I post the same thread in us.lexusownersclub mistaken it with this forum cuz of the old membership there

anyway there is no harm with extra help


Whenever I turn on the A/C the rpm rise as the compressor start which is normal... but somehow it delivers the power to the wheels also

in short: compressor click = race pedal automatically activated

I hardly feel it when I pass 65 kph (40 mph) but under that it's really annoying.... especially here in Bahrain where is the longest drive without braking never exceed 15 minutes which is very rare

I one let it go from 0 kph with the a/c on... once the compressor clicked I released the brake and it's almost reached 30 kph (18 mph)

+

fuel economy

I used to get about 14 - 16 L/100KM (16 - 14 mpg) estimated

but now 20 - 25 L/100KM (11 - 9 mpg)

Note: the fuel economy is a fresh issue but the ac is as old as my driving licence

Last edited by mjfuture; 05-28-14 at 11:38 AM.
Old 05-28-14, 11:01 AM
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timmy0tool
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yes it is normal for the RPMS to rise when the compressor is turned on to compensate for the extra load. with the rise comes more load on the transmission itself. how is your transmission? when was it last serviced? how many miles are on the motor/trans?
Old 05-28-14, 11:33 AM
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mjfuture
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transmission is fine

I bought the kit to change the gear oil last week but didn't have the chance to do it

i'll try to change it before sunday and give you guys the feedback

also I'm thinking of replacing the coolant temperature sensor for that matter
Old 05-28-14, 11:45 AM
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gear oil should only be OEM toyota type-IV. don't use anything else if possible. and yes replacing the coolant temp sensor is good preventive maintenance!
Old 05-28-14, 12:13 PM
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mjfuture
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only aftermarket tools on it are the a/c filter and interior LEDs

both the kit and sensor cost me $178.515 (OEM)

our dealer is #@%$#%$^%

I'll need to replace the brake pads soon which will cost over $217.507 here

but i'll order them from UAE for $131.300
Old 06-09-14, 02:12 AM
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mjfuture
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here is an update guys

so I replaced the coolant temperature sensor two days ago

but haven't notice any changes yet... but I'll keep posted

although the old sensor was fragile (almost powdery) it's even broke in the head

still there is the gear oil to be changed but no time really
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