The Jeep is a 2004 WJ with the 4.7L engine and about 125k miles. I bought it about 3000 miles/2 months ago. Shortly after I first purchased it I discovered a major coolant leak from the radiator. Had the radiator, all the hoses, and the cap replaced. Shop did a pressure test. I thought everything was fine.
I didn't notice any coolant loss over the next few weeks, but then I started to notice a slow, but noticeable drop (1/2-1 inch) of the coolant level in the reservoir. I filled it up and kept an eye on it the next couple of weeks. Still a slow drop.
Heater blows hot. Carpet is dry. No milkshake in the oil. No white smoke or odd smell from the exhaust. No visible leaks that I can see and no puddles on the ground. The engine starts and runs very smooth. Temp is almost always about 195-200 and never goes above 210.
Thinking it might be something like the head gasket I rented a block tester, but I'm having trouble using it. With the radiator cap off and the engine running the coolant in the radiator keeps slowly and steadily rising until it overflows. No bubbles at all and it's not gushing out - just a slow and steady rise. What does this indicate?
I didn't notice any coolant loss over the next few weeks, but then I started to notice a slow, but noticeable drop (1/2-1 inch) of the coolant level in the reservoir. I filled it up and kept an eye on it the next couple of weeks. Still a slow drop.
Heater blows hot. Carpet is dry. No milkshake in the oil. No white smoke or odd smell from the exhaust. No visible leaks that I can see and no puddles on the ground. The engine starts and runs very smooth. Temp is almost always about 195-200 and never goes above 210.
Thinking it might be something like the head gasket I rented a block tester, but I'm having trouble using it. With the radiator cap off and the engine running the coolant in the radiator keeps slowly and steadily rising until it overflows. No bubbles at all and it's not gushing out - just a slow and steady rise. What does this indicate?
Help diagnosing coolant leak
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