Losing radiator fluid. Fluid in reserve reservoir is not being drawn into radiator. Fluid loss about a quart per couple of weeks of driving about 50 miles. Can't find any dripping from radiator. Main hose to engine block appears ok.

if loss of fluid and assume overheating the noise is probably the coolant captivating or sloshing through hearet core --for loss test and check for head gasket or intake gasket failure

Yes, the radiator should be checked first for anti-freeze level. If it is low, top it off and pour remaining fluid into the reserve tank to the proper level. Re-check after driving and then you may just fill the reservoir only if you like.

Sorry to say you probably have engine troubles.
A leaking head gasket will drink the coolant and cause the bubbles to form.
A mechanic can check for leaks by pressurizing the cooling system and also checking for exhaust gas in the radiator.

Open the engine hood.

There will be several fluid reservoirs under the bonnet. If the car / truck has power steering, one of them will hold about 150-300ml of fluid that should be a red color. If you put some on your hand it is very slippery.

The other reservoirs will hold water for the windscreen washer, and one connected to the radiator to hold coolant.

Check that the reservoir you intend to put the power steering fliud in is not connected to the radiator and does not contain water.

Take the cap off to check.

If you can't see in to the bottom, roll up some kitchen paper towel and feed that in until you get some fluid on it - red, you hope!

There will be marks (horizontal lines) on the side of the reservoir showing "Min" (minimum) and "Max" (maximum or full). Slowly pour in replavcement fliud until the tiop of the fluid is between the marks.. Put the cap back on, close the engine hood, drive for a short distance (2 km?) and check the levels again.

Top up the reservoir to just under "Max". Replace the cap.

Check the level after a short period of normal driving - a couple of weeks, If it is still going down a mechanic needs to check the power steering seals.

good luck.

Yes it is not that hard to replace.


REMOVE OR DISCONNECT

1. Retainer and electrical connector from fluid level sensor.
2. Drain brake fluid front mister cylinder reservoir.
3. Reservoir hose from master cylinder. Plug hose to prevent fluid loss and contamination.
4. Brake pipes from master cylinder. Plug open pipes to prevent fluid loss and contamination.
5. Two attaching nuts.
6. Master cylinder.
7. Reservoir, if it is to he used on replacement master cylinder.

INSTALL OR CONNECT

1. Reservoir onto master cylinder, as needed.
2. Master cylinder on to power booster.
3. Attaching nuts. Tighten to 27 Nm (20 lb. ft.).
4. Brake pipes. Tighten brake pipe fittings to 15 Nm (11 lb. ft.).
5. Reservoir hose onto master cylinder.
6. Fill master cylinder reservoir to full level mark using only Delco Supreme 11 Brake Fluid, or equivalent DOT 3 brake fluid.
7. Electrical connector to fluid level sensor, secure with retainer.
8. Bleed hydraulic system.
9. Recheck fluid level in reservoir

put honda brand transmission fluid in the transmission fluid dipstick hole, if this is a 4cylinder, use 2.5 quarts to fill, if 6, use 3 quarts. if you are getting brown oilly substance in the radiator fluid reservoir, this usually means you have a blown head gasket, are you having overheating problems. try draining and filling your radiator with new fluid.

If it is a bright green, it is probably antifreeze, the reservoir for that is usually around 1/2 to 1 gallon. If it is about a cup to pint size, it may be clutch fluid. It should smell about the same as brake fluid. Usually clear or brownish clear in color.

the leak is the problem find it. it must be small and driving will keep it cool