"Harvey Sprayberry" wrote: (2000 Taurus)
Confirmed full coolant reservoir and drove 400 miles.
Waited one day, checked reservoir and it was empty.
Poured 1/2 gallon coolant into reservoir, drove 400 miles.
Waited 4 hours, checked reservoir and it was still full.
Temp gauge never showed anything unusual.
The reservoir level is dynamic, not just full or empty. Check its
dynamic performance to determine if everything is okay:
1.) Confirm that radiator is full and measure reservoir level COLD.
2.) Drive 10 miles and immediately measure reservoir level HOT.
3.) Wait 4 hours and measure reservoir level again WARM.
Wait overnight, then:
4.) Confirm that radiator is full and measure reservoir level COLD.
During testing, observe temperature gauge readings, listen and
smell for visible/invisible fluid leaks, look for cracked hoses or
wetness anywhere. Post another message here with the
results, and someone may have a valuable diagnosis.