Why is all the fluid staying in reserve tank-none

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.

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Does the temp gauge show overheat? If not, then you're not overheating. Possible you have a head gasket problem,which lets combustion gas into the water and can look like boilover.

replace the sensor in the bottle. you can check for a wiring issue by unplugging the sensor and see if the light goes out. if it doesn't, install a jumper wire in the connector. the float in the bottle is just an on/off switch

Check to see if your windshield wiper spray is working. If not, from the picture it looks like the supply hose from the reserve tank.

Sounds to me like a blown head gasket. Even if your vehicle is not warmed up, if your reserve tank is boiling fluid out of it when the engine is cool, it's most likely losing compression from it all going to your reserve tank. And thats why it's fluids coming out of your reserve tank. BUT, if your radiator is clogged then the same thing could happen. So i would start out cheap before you have to replace a HG. Thanks, James Booth been a mechanic for 6 years

your brake fluid tank reserve is low add some fluid to max level and check for any leaks hope this helps.

TAKE RADIATOR CAP OFF WITH ENGINE COLD AND CHECK WATER ..MAKE SURE RADIATOR NOT BLOCKED,,PLASTIC BAG ETC. THIS SOUNDS LIKE LOW WATER OR RADIATOR ..STOPPED UP INSIDE ..IF YOU HAVE GOOD HEAT IT'S FULL OF WATER. REPLACE T STAT B4 RADIATOR..IT'S CHEAPER. ALSO CHECK FOR RADIATOR COOLING FAN OPPERATION..I,M RULING OUT THE WATER PUMP.

check the condition of the reserve tank and the hose from the reserve tank to the radiator for leaks if no leaks there have the Radiator cap presure tested . also this could be a air lock in the engine if the radiator is new with the engine running and the heater on hot observe the fluid level in the radiator with the cap off if it drops as it warms add more coolant this will purge the air .

Just had the same problem! I have never had any problems out of my van and just had all fluids checked a month ago before going on vacation. One day it just started overheating and I had to urn the heater to pull the heat off of the motor to keep it cool enough to get it home. I put over a gallon of coolant in it and filled up the reserve tank. The next morning I took my kids to school about 4 miles away and my van started to miss really bad and the check engine light would come on every time I pressed down on the accelerator. I took it home and opened the hood and the reserve coolant tank was empty in just 8 miles of travel so I called the dealer and had them pick it up on a rollback since it is still under warranty. The dealer said it was a leak in the rear heater pipes that circulate antifreeze/coolant to the rear of the vehicle to supply heat for the rear heater and the miss was from the heat of the engine burning the spark plugs. So far it is a dealer item only and parts and labor are about $352. The vehicle will not leave any puddles when running while in park, only leak while moving, so they tell me. The dealer bypassed it somehow until my parts come in and my van drives fine. The pipes (maybe hoses,unsure) are actually a series of 3 that must be replaced. I may try to change them myself if they are just hoses.