I have a 2003 Grand Caravan Sport. I had no heat and checked the coolant level and it was way down. I went under the vehicle and can not identify any leaks and do not have any leaks on the ground. I refilled the coolant and the heater is working. But after checking the coolant level I am continuing to loose coolant without any signs of it on the ground. I do not have any signs that the heater core is leaking in the interior. My thought is it is either a head gasket or maybe a water pump. I have 213k miles on the vehicle. How can I isolate which issue is the problem? I have also noticed a growling noise when stopped and idling at a stoplight. Can these be related?
1st check the condition of the oil by checking the dipstick. If the oil looks milky then it's a head gasket issue. If oil is ok, refill coolant, start vehicle and let it run for 5 to 10 min. If you notice alot of white steam coming from exhaust then it's a head gasket. After vehicle reaches normal operating temperture, shut vehicle off. Now you're gonna have to check each individual spark plug. If you find one that's wet from coolant then you're gonna have to replace head gasket.
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