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Easy but messyJust changed this in my 94 AWD. The thermostat housing is just above the oil filter, about a third of the way back from front bumper. The housing, attached to a long hose running to the radiator, has two 12 mm nuts.

It's a realtively easy, though messy job.

Drain radiator into bucket. Petcock is just under the radiator, and free from cowling that covers most of front underside. It unscrews all the way(lefty loosey). Make sure coolant is not to hot when you do this. Screw petcock back in.

Move bucket under thermostat housing. Unscrew 12 mm nuts, pull housing(still attached to hose) away from engine, releasing more coolant. Thermostat may be stuck in engine or housing...I used water pump pliers to pluck it out. Again, more coolant flows. Peel off rubber gasket/o-ring from old thermostat, and work onto new thermostat.

Place new thermostat into housing in same orientation as old one removed. Push housing back in place (a little tricky, to keep thermostat seated). snug the 12 mm bolts back on.

Be careful refilling the radiator from overflow container. 50-50 water and antifreeze, until it seems full. Start engine with heater on full, keep topping coolant, after it warms up.

Put radiator reservoir cap back on. Test drive, check for leaks and coolant level again.

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โˆ™ 2011-09-13 05:12:55
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Q: How do you locate and change thermostat on 1994 Previa LE AWD?
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