The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - No pressure in upper radiator hose. Is this normal?

Corellian Corvette · 03-09-2006, 12:40 PM

OK all good questions.

1. Rad is full of fluid.
2. Yes upper hose gets hot and coolant is flowing - I ran the car with the rad cap off, and I could see when the thermostat opened to let all the hot water flow in.
3. I checked for typical head gasket leak (bubbling in the water) but the water is still. That doesn't rule out a head gasked leak as you say.
4. How do I tell a pressurized vs. non pressurized system? There is an overflow bottle, and the rad cap appears to be a standard AC Delco type unit from the 60's/70's.

03-09-2006, 12:40 PM	#6
Corellian Corvette Registered User Join Date: Mar 2006 Location: Kirkland, WA Posts: 51	Re: No pressure in upper radiator hose. Is this normal? OK all good questions. 1. Rad is full of fluid. 2. Yes upper hose gets hot and coolant is flowing - I ran the car with the rad cap off, and I could see when the thermostat opened to let all the hot water flow in. 3. I checked for typical head gasket leak (bubbling in the water) but the water is still. That doesn't rule out a head gasked leak as you say. 4. How do I tell a pressurized vs. non pressurized system? There is an overflow bottle, and the rad cap appears to be a standard AC Delco type unit from the 60's/70's.