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My car is running good ..... last week I had to put a new reservation tank in it bacause it had a split...... it was getting hot faster. Now its running well but there is a small leak at

I have a small leak at the thermostat ..... car is not over heating ..; is it ok to drive . On a 3 hr trip

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I wouldn't recommend that. Not if you enjoy the ride. If it's leaking already... it could just get worse along the way and burn the motor up. So have your mechanic check it and fix it. Even if it takes a bit.. it will be worth the wait.

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Sounds like it could be overheating. Especially if your wife is driving slow speed through town then there is less air going thru the radiator and the electric fan should take care of that. The reserve does not need to be full but should not be completely empty. When the engine coolant heats up it is pushed into the reserve tank when hot and then gets sucked back into engine when it cools. Anyways the first thing I would check is the radiator electric fan. If the fan is not working then the engine will overheat if stopped or at non-highway speeds. Check the fuse is good and make sure the fan relay is working. There is a seperate fan that works for the a/c and if you notice it start running rough then turn on the a/c and that will kick on the other electric motor to help cool the engine(just hope it is not winter time). You could let the engine idle for a while and see if the fan comes on. The mechanic using the computer has the ability with that computer to actually tell the car's computer to turn on the fan that way he can verify it is working. Sometimes thermostats go bad and can get stuck closed and cause an overheating issue also. So you could also replace the thermostat. Let me know if you have any more questions.

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Replace the thermostat

If there was no flow and then the engine overheated, that means the thermostat failed to open. The fact you get flow with the thermostat removed confirms this. I would get a Nissan thermostat, part number 21200-V5010, and install it, making sure the "jiggle" valve is on top.

When I refill the system, I fill up the cooling system and coolant reserve tank and install a little home made tool that is just the a the large end of a small paper clip so it is just a "U" shaped piece of wire. Then I slide it under the small intake valve of the radiator cap and put the cap back on.

Now I just let the engine run with the heater on full HOT and the air will escape into the coolant reserve tank. After about 20 minutes I shut the engine off and let it cool down making sure the reserve tank is at least up to the FULL HOT line. Remove the "U" clip and you should be all set.

If necessary, you can bleed the cooling system by loosening the #1 intake manifold runner bolt.

Good luck and remember rated this help!

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