Question about 1995 Geo Prizm
The 1.8 is Toyota's 7A-FE engine. It is located in the housing on the side of the engine block on the gearbox side of the engine beneath the distributor. The lower radiator hose connects to this housing:
Posted on Sep 07, 2010
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Posted on Jan 02, 2017
Follow the upper radiator hose from the radiator to the engine where the hose stops. Under the housing where the hose is attached to the engine is the thermostat.
Posted on May 13, 2010
Tips for a great answer:
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Prepare for the replacement by disconnecting the negative battery cable and draining the engine coolant into a container--you need to remove the drain plug from the radiator first and then the drain plug at the engine block.
Remove the engine's cooling fan by loosening the fan/water pump pulley nuts, unclipping and removing the fan shroud's lower half, removing the water pump pulley nuts and pulling the fan out from underneath.
Disconnect all components blocking access to the thermostat by removing their bolts. On four-cylinder engines, this includes the air cleaner, air intake duct and the power steering pump's support bracket. On a 3.3 liter V6 or SOHC engine, remove the upper radiator hose from the intake manifold's coolant outlet.
Slip off the drive belts blocking the thermostat by turning their tensioner bolts with a wrench or breaker bar. On a 3.3 liter truck or DOHC engine, follow this by removing the upper idler pulley bracket. On a 3.5 liter engine, remove the water pump drain plug from the front end of the block.
Detach all hoses from the thermostat housing cover by loosening the hose clamps with pliers; this usually includes the lower radiator hose. This is only needed on V6 engines; you will keep the hose attached on a four-cylinder.
Remove the thermostat housing cover by removing its bolts. There will be some coolant spilling out when the gasket seal breaks.
Disconnect and remove the thermostat from its cover by removing its screws. Take note of how the thermostat is positioned within the cover.
Scrape away all traces of gasket or sealant from the housing and cover and clean the surfaces with lacquer thinner.
Apply RTV sealant around the edge of the thermostat cover. You need to re-install the cover within five minutes of applying this sealant.
Mount the new thermostat into the cover in the same position the old thermostat was in.
Re-install the thermostat cover and all other parts in reverse order of installation.
Wait a half hour for the RTV sealant to cure before refilling the engine coolant. Use fresh coolant if the old coolant is contaminated.
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Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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