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Re: When the car is on a lift, should your front wheel...
If the car is in neutral then yes it should. If the vehicle is in park than no it should not be spinning freely. If it is in neutral and it does not spin freely than you may have a locked brake caliper.
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I need to know the year and if your 4X4 is electronic or manual shifter.
Most older 4X4 Toyotas have manual hub lock.you will find on the hub lock and unlock position
IF you have both front wheels in the air then either wheel will spin freely unless you have diff lock or limited slip diff. That is the nature of a diff..wd means that all 4 wheels drive but only when you have a limited slip diff or a diff locker. in action . If you have both of one side wheels in a bog you will not go any where.
Lock in your 4 wheel drive, and get under the truck, and try to manually turn the front drive-shaft. If the drive-shaft spins freely, then your 4x4 is not locking in correctly, and you may need to replace the lockers. Good luck!
SOUNDS LIKE A BAD HUB TRY THIS TO DIAGNOSE THE PROBLEM
Put the transmission in park, set the parking brake and raise the chassis so one of the front wheels is off the ground while the other is still on the ground. When the transfer case is in two-wheel drive, the hubs should be released allowing the wheels to turn freely when spun by hand. If the axle shaft turns when you spin the wheel, it means the hub has not disengaged.
To check engagement, rotate the axle shaft backwards. This should lock the hub. Try turning the wheel by hand again. The axle shaft should now turn with the wheel if the hub is locked. If the hub fails to lock, the hub will have to be disassembled and inspected or replaced.
To check release, hold the axle shaft steady and rotate the wheel backwards. You should hear a click as the locking mechanism slides back out and disengages the hub. Rotate the wheel forward again and it should turn freely.
Another way to check the hubs is to raise the vehicle on a frame contact lift so all four wheels are off the ground. Then start the engine and place the transfer case in four-wheel drive and the transmission in drive. If the front wheels don't turn, look at the front axle shafts. If both shafts are turning, but one wheel is not, the problem is a bad hub on the wheel that isn't turning. If the front driveshafts are not turning when the transfer case is in four-wheel drive, the problem is inside the differential (broken side gears) or the transfer case (broken chain, shift linkage, etc.). If the driveshaft between the transfer case and differential is turning, the problem is in the differential. If the driveshaft is not turning, the vehicle is going to need repairs to the transfer case.
Hope this helps.
There is an electrically driven clutch on the front of the air conditioning compressor which engages when air conditioning is required The AC compressor has a fan belt driven wheel on the front of it. The belt turns this wheel all the time. When the a/c is off this wheel spins freely. When a/c is required the electrically driven clutch engages this spinning wheel to supply drive to the a/c compressor shaft. The 0645 code concerns a fault with this clutch.
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