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This reply falls under, " what else should I look at."
When you press to squirt, do you hear any sound? if you do there are 3 easy things you can do.
1. Some of the windshield wiper reserviors, ( plastic bottles ), need a minimumlevel of fluid to operate, so, make sure you fill up your reservior.
If that doesn't help;
2. There is a very small hose that runs from the reservior to the pump, pull it off of the pump end, very carefully, and have someone hit the squirter.
If fluid comes through the hose;
3. Take a very small paper clip, straighten one end out, and push it into the ports that the water shoots out of to squirt the windshield.
Sometimes wax or debree can clogg these very little holes.
If you need Illistration I Can Email it to you Im at rejakwilson @ aol.com
CAUTION: Do not mix Standard (green) Coolant with Extended Life Coolant (orange). If mixing occurs, drain engine cooling system and refill with originally equipped coolant type. If this contamination occurs, the service change interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles.
Drain radiator until engine coolant is out of degas bottle. Disconnect radiator overflow hose and engine coolant vent hose at degas bottle.
Remove power steering oil reservoir retaining screws and position power steering oil reservoir out of the way.
Remove degas bottle return hose and clamp. Remove degas bottle retainers and remove degas bottle.
Position degas bottle in vehicle and install retaining screw and nut. Tighten retaining bolt and nut to 9-12 Nm (80-106 inch lbs.)
Connect degas bottle hose and clamp to degas bottle.
Position power steering oil reservoir onto degas bottle and install retaining screws securely.
Connect radiator overflow hose and engine coolant vent hose to degas bottle.
First, Is there actually coolant in the over flow tank?
If the bottle is full the coolant level sensor may be bad. The sensor pulls out the bottom of the overflow reservior.
If the bottle gets low overnight there is a leak. Check the radiator side tanks for leaks. You need to look from underneath the car at the joint where the radiator meets the black tanks on the left and right sides.
You also need to look from underneath for most of the other hoses on the car, the car is turbo most likely and there are hoses that go to and from the turbos, into the cabin, and to and from the engine.
Leaks are hard to find from just looking from the top of the engine.
If the gauges read normal and the fans are working properly and the vehicle dosen't overheat. I would suggest that it's the normal operation of the vehicle.
The overflow bottle is there because when the vehicle get's hot it draws in the extra coolant from the overflow. When the engine cools down it will push the extra coolant back into the overflow, that's what the radiator cap is for, it's not just a cover for the radiator. At a certian pressure the radiator cap will release the coolant to the overflow bottle. Otherwise the super heated coolant would have nowhere to expand to and blow apart hoses and such.
One other thing to check is if the coolant is a proper mix of antifreeze and water. You can buy a coolant check tool from any auto store, they don't cost too much.
Tip: Use distilled water instead of tap water (or use pre-mixed antifreeze). In some cars regular tap water will speed up corrosion in the cooling system.