My car does not overheat,but the hose that goes from the radiator to the overflow reserve tank leaks while idling and when I drive the car and turn it off, the reserve tank is almost empty of antifreeze and I have relaced the radiator cap but it leaks quite a bit from the opened end of the tube on the reserve tank. I have not notice any water on the passenger side floor board .when i turn the car on after it begans to get a little warm up , it squirts antifreeze from the hose on the tank, and after i turn the car off.
also the fans that are behind the radiator,are they suppose to run all the time ? or just when the car heats up?
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Re: 1990 mazda miata
Will pepper swtop a radiator leak
Improvement done by sickofjunk
There are radiator sealants available at many auto parts stores. I
personally have never been able to get them to work though another good
way to seal a leak if it is on the aluminum part of the radiator is to
soder it with silver soder. And no i don't think pepper will stop a
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From the reserve tank, one hose should go to the radiator and the other should be for overflow. Sometimes that one goes to an accumulator, sometimes its left dangling cause its just there to drain any excess fluid from expansion in a hot system. Depends on the vehicle. If its in an enclosed system or plugged you would get an excess of back pressure which would further heat up the coolant and inhibit flow. Just leave it there. If it pukes coolant when hot then its doing its job. Don't overflow your reserve tank.
I would be thinking radiator or water pump. When the engine is warmed up and the upper hose is hot, feel the lower radiator hose. It should be hot too, just a little cooler than the upper hose. If there is some blockage in the radiator, the lower hose may feel cold or just lukewarm. Even though the water pump doesn't leak, the impellers may be made of plastic and have considerable wear. That would restrict circulation. The heater core should not be an issue. Heater cores do not cause overheating even when totally plugged up.
you have a blown head gasket.. doesn't have to have coolant in the oil for a blown head gasket... if hoses are rock hard when running then you have exhaust leaking into the coolant via a blown head gasket...
You have a leak in the radiator, water pump, a hose, the heater or a head gasket. Check these and see if there is any water coming out of the exhaust or in the sump.
Take off the radiator cap, fill it right up to the neck, start the engine and warm it up. See if there are any bubbles in the top of the radiator, keep it topped up so there is no room in the top tank.
If there are continuous bubbles then there is a leak in the head gasket.
CAR OVERHEATING FIRST CHECK FOR LOW COOLANT IN THE RADIATOR COOLANT OVERFLOW JUG.IF COOLANT LEVEL IN OVERFLOW JUG LOW REFILL ADD COOLANT BACK TO THE FULL COLD MARK.PUT RADAITOR CAP ON COOLANT OVERFLOW JUG START ENGINE LET IT IDLE UNTIL IT OPERATING TEMPERATURE.MAKE SURE TOP RADIATOR HOSE GETTING HOT WHILE ENGINE WARM UP.IF TOP RADIATOR HOSE DONT GET HOT WHILE ENGINE IDLING YOUR THERMOSTAT COULD BE STUCK CLOSE CAUSING CAR TO OVERHEAT.IF TOP HOSE IS GETTING HOT.CHECK FOR COOLANT LEAKS CHECK TOP RADIATOR HOSE AND BOTTOM RADIATOR HOSE FOR LEAKS.CHECK FOR LEAKS AT THE RADIATOR CORES AND PLASTIC SIDE CONTAINERS.IF ALL IS GOOD ENGINE OVERHEATING WHILE IN A LONG TRAFFIC LINE, COOLANT FANS NOT COMING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR BLOWN COOLING FAN FUSE OR RELAY.COULD HAVE PCM FAULT.MAKE COOLING FAN ELECTRICAL CONNECTORS AND WIRING NOT DAMAGE OR BROKEN.
The hose is an over flow drain. If you've seen no signs of leaks then most likely your radiator cap is bad. The cap helps to pressurize the cooling system, if it is bad it allows to much coolant out to the over flow tank and the extra is dumped while your driving. When you turn off your engine the fluid is drawn back into the radiator and your coolant mysteriously disappears.
Due to the complexity of the newer cars on the raod today!! what you are experiencing is Normal!!! since the coolant systems on the newer cars run at such a higher pressure and a high Rpm the reserve tank which has it's on drain hose for excessive overflow from the radiator allows the extra high pressure release from the radiator to back flow to the reserve tank and then out the reserve tank overflow hose on to the raod