1999 C-1500 Suburban Coolant System Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shultzee13 · 02-25-2013, 11:34 AM

Brand new water pump installed less than 6 months ago.

When driving vehicle water in reservior rises to the hot line and above slightly. Happens when running heat or AC. No difference. After car sits and cools water level returns to normal down to the cold line. Just started doing this yesterday.

How do I know if it's the water pump or the thermostat?
Would like to fix the right problem the first time. LOL

Thank you
Eric

**truckdude239** · 02-25-2013, 12:41 PM

Umm thats normal dude

**truckdude239** · 02-25-2013, 12:42 PM

Water expands when it heats up so the water level rises int he tank

**Boog** · 02-25-2013, 09:38 PM

That's why the tank has a hot line and a cold line.

02-25-2013, 11:34 AM	#1
shultzee13 Registered User Join Date: Jan 2012 Location: Tyler Texas Posts: 223	1999 C-1500 Suburban Coolant System Question Brand new water pump installed less than 6 months ago. When driving vehicle water in reservior rises to the hot line and above slightly. Happens when running heat or AC. No difference. After car sits and cools water level returns to normal down to the cold line. Just started doing this yesterday. How do I know if it's the water pump or the thermostat? Would like to fix the right problem the first time. LOL Thank you Eric

02-25-2013, 12:41 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: 1999 C-1500 Suburban Coolant System Question Umm thats normal dude __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

02-25-2013, 12:42 PM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: 1999 C-1500 Suburban Coolant System Question Water expands when it heats up so the water level rises int he tank __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

02-25-2013, 09:38 PM	#4
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,534	Re: 1999 C-1500 Suburban Coolant System Question That's why the tank has a hot line and a cold line. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross



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