Coolant leak

KJAX1230

MEMBER
2006 PONTIAC GRAND PRIX
3.6L
6 CYL
2WD
AUTOMATIC
175,000 MILES

Coolant is pouring out as quick as you can fill it. The coolant is coming out from under the engine. It is not the water pump, any hoses or the elbows. All have been replaced. Also replaced the upper and lower intake gaskets. Only thing I can think of is freeze plugs? The leak is about center of the engine and puddle on the frame cross bar. Very difficult to see the source but it appears to be between the intake manifold and valve assembly.

2 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I am Danny.

The best thing is to wait for car/engine to cool down before you really start looking around. If you do not have access to a cooling system pressure tester your local auto parts stores (Pep Boys,Autozone, O'Reilly's) has a loaner program and will rent you one. Basically it goes on in place of the radiator cap and pressurizes the system. Once pressurized you will be able to see where the leak(s) are coming from. Be sure to fill with just plain water first to not waste antifreeze while looking for leak. I have attached a tutorial showing what is involved. Hope this helps and feel free to ask any questions if needed.Thanks for using 2CarPros.
Danny-

https://www.2carpros.com/articles/radiator-pressure-test

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Sunday, September 9th, 2018 AT 5:51 PM

JACOBANDNICKOLAS

MECHANIC
109,779 POSTS

Hi and thanks for using 2CarPros. Com.

It could be a freeze plug. I have attached a picture of the engine block and its components. It shows where the engine block expansion plugs are located. Here is the list of parts. It is long, sorry.

Engine Block and Components

100 - Engine Block
101 - Cylinder Head Locator Pins
102 - Starter Motor Heat Shield Bolt - Large
103 - Starter Motor Heat Shield Bolt - Small
104 - Starter Motor Heat Shield
105 - Knock Sensor
106 - Engine Block Expansion Plug
107 - Engine Front Cover Locator Pins
107 - Engine Front Cover Locator Pins
108 - Engine Block Coolant Drain Plug
109 - Timing Chain Dampener
110 - Engine Block Oil Gallery Plug - Front
111 - Engine Mount Strut Access Hole Plug
112 - Engine Mount Strut Bracket Stud
113 - Engine Block Oil Gallery Plug - Right
128 - Connecting Rod Bearing Cap Bolt
129 - Connecting Rod Bearing Cap
130 - Connecting Rod Bearing
131 - Connecting Rod
132 - Piston Pin Retainer
133 - Piston Pin
134 - Piston
135 - Piston Oil Control Ring
136 - Piston Compression Ring
137 - Piston Compression Ring
138 - Drive Belt Idler Pulley Bracket Bolt - Lower - Supercharger
139 - Drive Belt Idler Pulley - Lower - Supercharger
140 - Drive Belt Idler Pulley Bolt - Lower - Supercharger
141 - Drive Bolt Idler Pulley Bracket - Lower - Supercharger
230 - Camshaft Bearing - 1 & 4
230 - Camshaft Bearing - 1 & 4
231 - Camshaft Bearing - 2 & 3
232 - Camshaft
233 - Camshaft Key
234 - Camshaft Thrust Plate
235 - Camshaft Thrust Plate Bolt
236 - Balance Shaft Drive Gear
237 - Camshaft Sprocket
238 - Camshaft Position Sensor Magnet
239 - Timing Chain
240 - Camshaft Sprocket Bolt
241 - Crankshaft Sprocket
242 - Balance Shaft Rear Bushing
243 - Balance Shaft
244 - Balance Shaft Gear Pin
245 - Balance Shaft Retainer
246 - Balance Shaft Retainer Bolt
247 - Balance Shaft Driven Gear
248 - Balance Shaft Gear Bolt
405 - Oil Pump Screen Bolt
406 - Oil Pump Screen
407 - Oil Pump Screen Gasket
416 - Oil Level Indicator Tube
417 - Oil Level Indicator
418 - Oil Level Indicator Tube Nut
419 - Oil Level Indicator Tube Seal
547 - Transmission Locator Pin
548 - Crankshaft Rear Oil Seal Housing Gasket
549 - Crankshaft Rear Oil Seal Housing
550 - Crankshaft Rear Oil Seal Housing Bolt

Let me know if this helps

Joe

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