I have a 92 Acura Legend L V6 engine. My acura had been running hot until I put a brand new radiator on it, I drove the car for appro 40 miles one way and back, still didn't run hot. The car heater wasn't blowing out any heat so I had a thermostat put in, then drove the car about a half of mile then it started running hot. Took the thermostat out, drove it all around town and it did not run hot. What would cause my car to run hot with the thermostat in?

your car should be equiped with a 3.2L OHC V6 the most common thing on these old Acura's was a broken timming belt, does the engine seam to crank very fast? if it does suppect the belt. you will need to remove the top covers on the engine and see if the camshafts are turning. i have included a diagram of the belt setup check the belt and get back with me, if it is the belt you will neeed to put the engine back into valve timing....talk to you soon

I am not totally sure, however I just put a thermostat in an acura, and it was under the passenger timing belt cover. Hope this helps.

first check he put the right plugs back in your car,,,,then check the plug leads are all on the right plugs,,if there not the engine will try to kick back when trying to start and if it did start the engine would jump about and missfire also you would not have any power from it,,,if you find any thing wrong under the hood
,go get a big stick and beet him with it till he gets it right!!!
then throw him out in the street,,and buy a puppy insted!!!!
as for the oily plugs,,,so what??? its an old car,, if its not pumping out blue smoke and burning engine oil dont worry about it,,,its likely to run on for years,,,longer than he may?

You have to bleed all the air out of the radiator by letting the engine run until it gets hot, as it does this you will see lots of air coming out of the radiator, almost gurgling, keep the radiator coolant filled as it does this until all the air is out and it stops gurgling. It should be fine then and not overheat unless something else is wrong.

Run hot wire from battery to coil to see lf that is your problem.

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

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Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

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MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

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Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

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A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

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This could happen if your fan is indeed weak.  To test disconnect the thermostat of the radiator by removing the terminals near the radiator hose towards the engine.  You should see the fan run at its highest speed, then you can check if your fan has weakened.

You may try a product like transmedic if that does not work you have a bad transmission. Dont forget to rate.

Thremostat is located in engine just before the engine cooling system return hose, three bolt housing (thermostst housing) the lower coolant hose on the radiator is the cooled return hose.