I have a suzuki vitara 1600 year 2000. I have a loss of anti-freeze from the expantion tank that drains my radiator ,i have looked for external leakage and canot see any. Also the temperature gauge is slow getting up to heat.

Yes you can use Car Quest Anti-Freeze in your Suzuki. I would first flush the radiator and heater core and replace the Thermostat as well. It is also a good time to replace the Radiator cap as they wear out as well. I would also recommend getting your cooling system Pressure Tested before doing anything so you know you do not have a blown head gasket.

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the answer is this in USA, are you>?
open hood, look up ,behold the white sticker, and is there.
all suz. have a timing freeze jumper, starting in newer years its a factory only scan tool setting.
on yours, must 1.6L , the liters tell me what engine not valve count.
to set timing, you need a strobe light , got one?
1: hot motor.
2; idle rpm perfect. not too low, or high.
4: timing freeze, enabled.
5: set timing with strobe , using under hood sticker data.

have a coolant system pressure test done and look for leaks at the welsh plugs, water pump hole under water pump, heater core inside

labor time 1.4 hr + drain tank
need remove fuel tank, pump in the tank at top 6 bolt attach it

If it isn't over heating it shouldn't be a problem unless you are seeing water in the engine oil. Add a 50/50 mix of Anti Freeze and water to the over flow bottle to the full mark and allow the closed circulation of the vehicle to bring in what it needs. It is designed to draw fluid from that bottle when needed. Always add fluid to the radiator through that unless you have drained the radiator for some reason. Any good Antifreeze will work. Personally I use Prestone and Prestone has a ready mix available as well to simplify the process.

try looking at the expantion tank.....follow the small hose from the top of the radiator.....

Follow the upper radiator hose off the radiator to the block, the thermostat should be their inside a removable housing

The radiator drain plug is on passenger side of the radiator tank at the bottom. You can use pliers to loosen it. Be careful that it does NOT come out, only loosen it enough to drain the anti freeze.

this would more than likely be cause by a bad cylinder head gasket. I would bet 89% this is your problem.