Thermostat or Waterpump?

lDejavul · 12-05-2019, 02:19 PM

So today I was at the gas station and when I came back out to my car my car was dinging and I saw coolant underneath my car. I looked at the dash and it was overheating.

I'm home now and have it on lift. I couldn't find the leak at all until I let it idle for a while and found that once it hit 260 and the overheating warning came on that there is a weep hole on the bottom tank that would fill up once it overheated. Literally at the same exact time the car got the error and the water started flowing out the weep hole.

Would this be more likely the thermostat and not the waterpump?

geaux_tigerss · 12-05-2019, 03:57 PM

waterpump

L78toLT1 · 12-06-2019, 01:01 PM

I'd vote thermostat. When the OP references the weep hole, he's referring to two vent holes in the top of the overflow tank - the bottom section of the tank. There are two holes in the tank an inch or so above the max fill line. If the car overheats and produces steam, it will blow out these holes and immediately condense. If the water pump was bad, coolant would be leaking form the weep hole in the pump, which you can inspect thru the holes in the pulley.

Root · 07-19-2020, 10:16 PM

So what was the out come? I just lost all my coolant driving normally. Trailered it to a lift at work and left it there to look at tomorrow since it was late. Just wondering what I might find.

12-05-2019, 02:19 PM	#1
lDejavul Drives: Camaro SS Join Date: Sep 2015 Location: Oklahoma Posts: 621 View My Garage	Thermostat or Waterpump? So today I was at the gas station and when I came back out to my car my car was dinging and I saw coolant underneath my car. I looked at the dash and it was overheating. I'm home now and have it on lift. I couldn't find the leak at all until I let it idle for a while and found that once it hit 260 and the overheating warning came on that there is a weep hole on the bottom tank that would fill up once it overheated. Literally at the same exact time the car got the error and the water started flowing out the weep hole. Would this be more likely the thermostat and not the waterpump? __________________ Adrenaline Red 20" 5 Spoke Black Black Side Spear Dual Mode Exhaust MRC Splash Guards 1G1FG1R74G0124089

12-05-2019, 03:57 PM	#2
geaux_tigerss Drives: 2019 GMC Sierra 1500 AT4 Join Date: Nov 2011 Location: Orange, TX Posts: 740	waterpump __________________ 2019 GMC Sierra 1500 AT4 Summit White 6" Lift, 37x13.50R24's

12-06-2019, 01:01 PM	#3
L78toLT1 Drives: Hyper Blue 2016 2SS 6M Join Date: Sep 2017 Location: North Ga Posts: 1,786	I'd vote thermostat. When the OP references the weep hole, he's referring to two vent holes in the top of the overflow tank - the bottom section of the tank. There are two holes in the tank an inch or so above the max fill line. If the car overheats and produces steam, it will blow out these holes and immediately condense. If the water pump was bad, coolant would be leaking form the weep hole in the pump, which you can inspect thru the holes in the pulley. __________________ Baby Blue 2016 Hyper Blue 2SS/6m/MRC/NPP/Silver Rally stripes/ZL1 wheels & brakes/GForce DS and axles/ZLE Cradle Bushings/FE4 ARB front & rear/SEMA Grill/Rotofab dry/95mm TB/Magnuson 2300/Full LT4 fuel system/JMS boost-a-pump/E85 Sensor/Ported CID heads from LME/Cammotion PD cam/Thompson Motorsports forged shortblock/catted Kooks 1 7/8 headers /JRE remote tuned

07-19-2020, 10:16 PM	#4
Root Drives: Silverado, Camaro Join Date: Jul 2016 Location: Here Posts: 14 View My Garage	So what was the out come? I just lost all my coolant driving normally. Trailered it to a lift at work and left it there to look at tomorrow since it was late. Just wondering what I might find.

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