Acura 19301-PAA-306 Thermostat Assembly (Nippon Thermostat)

Before supposing that the thermostat is responsible for cooling system trouble, check the coolant level, tension of the drivebelt and if temperature gauge operates. If it takes a while for the engine to warm up, then most probably the thermostat is stuck open and needs to be replaced. In case your engine runs hot and lower radiator hose isn't hot, you may need to replace its thermostat which may be closed frozen. No driving must happen without a thermostat in a vehicle because it will impair computer operations as well as fuel economy. This means that the coolant is moving and that thermostat is open if lower radiator hose becomes hot. Start by removing cable from negative terminal of battery before replacing the old one with new one. Drain coolant system only when antifreeze is in good condition should you save it out instead of disposing off Pouring down into environment's drain plug. Follow lower radiator hose on an engine to where there are thermostat housing covers. Disconnect electrical connector connected to coolant temperature sensor or detach the hose from fitting Remove this fitting by using adjustable pliers twisting on stuck hose breaking its seal Sometimes such hoses are cut away and a fresh pipe fitted in place Once this fitting has deteriorated beyond use; you should now consider changing these covers of housing for thermostats Removing bolts covering thermostat cover edging them apart Note how they were installed so that you can remove them Clean any old gasket material or sealant from housing as well as cover The rubber gasket placed over top of new thermostats thus further known as jiggle pin would also be installed into these engines' housings Lastly, tightens securely all bolts together with installing hose clam again Check for leaks after refilling cooling system before starting engine.

To see if the thermostat causes cooling problems, first check your coolant level, drive belt tightness, and how well the temperature gauge reads. When the heater or temperature gauge shows delays while the car warms up, a stuck-open thermostat usually causes the problem and requires a replacement. When your engine is running too hot, check the upper radiator hose's temperature to see if heat escapes; if the hose is cold even though the engine is running, the thermostat is stuck open and needs to be replaced. Caution: Run your car at your own risk when the thermostat is missing, or the vehicle's computer might work in a reduced efficiency mode to waste gas and create more pollution. You know for sure that the thermostat is open when the upper coolant hose stays warm. Before working on the car's cooling system, remove the negative battery cable. Also empty the coolant by draining it, and if the fluid is in great shape, store and use it again. Follow the upper radiator hose to find where the thermostat is located. On a Legend, go below the throttle body to see the thermostat, and you may have to remove the intake air duct first. Release the hose clamp from the hose connection, and remove it if it's stuck. Use pliers to twist and split the hose, or cut it off completely if it is old and worn. The mating fitting to the hose has to go before we can replace it if it's damaged by corrosion or pitting. Reach behind the housing outlet using a screwdriver to take off all bolts, then gently remove the outlet while keeping track of where brackets go for easy reinstallation. A soft-face hammer can help break loose a stuck cover while you prepare for coolant to leak out. Take the thermostat out, mark its original spot through the jiggle pin going up, and scrub all remaining old gasket material from the housing and output connections. First, put a new rubber seal around the thermostat. Place the fresh thermostat in the housing without adding sealant to it. Ensure that the jiggle pin stays on top and that the spring end points toward the engine when you fit everything in place. Slide the outlet cover back into place. Screw in the bolts, tightening them to the correct force listed in the manual. Slightly reconnect the hose by securing the clamp with small tugs, and put back everything taken out along the way. Place the new thermostat in the housing, bolt everything back together, fill up your coolant, turn the engine on and let it heat up naturally, watch for leaks, and make sure the heating system works well.