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Thread: 99 suburban coolent usage
05-13-2010, 08:52 PM #1
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99 suburban coolent usage
hey guys,this is my first try at this,so here go's I have a 99 suburban with 135k on it. It mysterisly gos through coolent, about a quart every 1200 mi,It had intake gaskets at about 100k,sometimes it will miss at start up,but then clears out and will run fine,also reasently had fuel injectors,cap&rotor,plugs and wires. any ideas? also the cooling system holds pressure
05-13-2010, 09:06 PM #21995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes
05-13-2010, 09:55 PM #3
I would probably start by putting a cooling system pressure tester (Autozone and maybe other places lend them out) on it. Many time, you can find the leak if the system is pressured up cold.'98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
'92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
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05-14-2010, 04:26 AM #4
A quart every 1200 miles is probably about a quart every three weeks or so. Correct me if I'm wrong . I have seen a number of these radiators with plastic ends that get hairline cracks where the incoming coolant hits the wall of the radiator (front side by the grill) that leak at about this rate.. It seeps out when the engine is warm and system under pressure. Look for coolant or moisture at the bottom of the radiator in the mounting channel. Its a possibility.
05-14-2010, 08:15 AM #5
No smell of antifreeze in the tail pipe??95 tahoe 2dr 4x4 200,000+ miles
05-14-2010, 10:22 AM #6
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05-14-2010, 11:28 AM #7
I had the tank crack on both my trucks but to fix them cost more than a radiator! Since I was ordering a rad I replaced the old single row with a dual row they use the same brackets and drops right in.
I got my rad from radiatorclassic off of Ebay and have been very pleased I ordered from them 2 different times.
Also those pesky intake manifold gaskets will be leaking and you will never find it.My trucks!
1996 GMC Suburban SLT
1997 GMC Yukon SLT
05-15-2010, 09:59 AM #8
9 out of 10 times on these vortec 350 its the intake gasket, mine never spewed the tell tale white smoke, if its never been changed on yours then its time, and by the way, do the head gaskets at the same time, it will just save you labor down the road. you got the entire top side ripped off anyway, might as well just take out a few more bolts.99 K1500 Suburban LT "THE BEAST"
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