from a friend's CRV; 2-3 month ago, the coolant was drained and then 1 bottle of Honda coolant was added. now just found out there is no coolant in the reservoir, but observation from radiator cap still it looks pretty full. so maybe there is a minor under fill of coolant? he also mention the car's coolant temperature gauge is normal all these time, and the car was driven short distance (10-15km/trip, and 20km max) a few times each month in winter only. we now wonder what is the risk or maybe damage that could happen to this CRV. thanks