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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Chevrolet Silverado 1500: I have a 99 Chevy Silverado 4.3 v-6

Customer Question

I have a 99 Chevy Silverado 4.3 v-6 with 195,000 miles. Started seeing "low coolant" light a year ago but could see no leak. Every couple of months I added a quart or less of coolant. Recently "low coolant" light came on more frequently and I had to add around a gallon of coolant about every 50 miles. Found leaking coolant dripping on to exhaust pipe from what looks like plate with a gasket leading to heater core (on passenger side). There is no water in interior of truck, but I can smell coolant when AC is on or off. If I run defroster, front window frosts up. I can also sometimes see wisps of vapor or smoke coming from heater/cooler output vent. Reading forum posts from owners of same vehicle that it could be heater core or intake gasket. Checked oil dipstick and there is no foam. Truck runs ok and does not overheat even when low coolant light is on.
Submitted: 2 years ago.
Category: Chevy
Customer: replied 2 years ago.
Forgot to include that when driving the truck in the early morning, the front windshield fogged up. Defroster did not help, but turning on AC did.
Expert:  Gary replied 2 years ago.
can you be sure with a mirror looking at the back side of the intake manifold corners where the intake meets the cylinder heads and is there any coolant there leaking or seeping out in that area ?