Antifreeze level down why?

DALRUBAIE

MEMBER
DODGE CARAVAN

I have a 2001 GC that has just developed a problem. One night I had heat just fine, the next day I had cold air coming out instead. I decided to check my antifreeze level, and found the reservoir bone dry. I added up to the fill line more antifreeze. The air again became warm. I decided to check the antifreeze level again the next day after a long drive, and found the reservoir again bone dry. I added more antifreeze. I have gone through a whole gallon now with the same circumstances, and I am concerned what might be wrong. Also, I have checked under my vehicle and have found no puddles or leaking. Is it safe to keep adding the antifreeze or should it be checked out at the dealer? It otherwise runs fine. I have about 110.000 miles on it. Any help would be appreciated.
Thank you

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Preventive maintenance: Replace the thermostat and radiator cap.

Now bleed the cooling system see below

BLEEDING COOLING SYSTEM:

Always bleed air from cooling system after replacing coolant. Set heater for maximum heat. Remove radiator cap. Loosen drain plug and remove drain bolt (if equipped) from engine block. Drain coolant reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant mixture. Loosen bleed bolt and fill radiator up to base of filler neck. Close bleed bolt when coolant flows out without bubbles. Tighten bleed bolt. With radiator cap removed, start and operate engine to normal operating temperature. Add coolant if necessary and check for leaks.