How do i know if water pump is bad on 06 monte carlo ss 5.3

you have a blown head gasket or leak at the intake gasket 9 out of 10 it the head gasket good luck....

Sounds like the oil pressure sending unit is bad.

water pump gone out

ck the alt. output should be around 13/14 volts

possible mass air flow senser

bad

gaskt probabley but grab the front shsft and wiggle it any play and its shot careful hot replace anyway too much labor to do twice

Hi, check the connection on your temperature sensor. If the connection is good, replace the sensor. The cost is about $11 at autozone. The sensor is located at the back of the engine, near the transmission. See pictures below. Use some water pump sealant on the threads when installing the new sensor. Please let me know if you have any questions, and thanks for using FixYa.

3.4 liter engine:



3.8 liter engine:

G100
Battery cable, negative cable, RH side of engine compartment to the RH frame rail
G101
Left side of the radiator support
G111
Top right of the engine, below the ignition control module
G113
Lower LF of the engine, on the automatic transaxle stud, near the starter
G151
On the left frame rail, forward of the left front strut tower
G171
On the left frame rail, right of the left front strut tower, rear of G151
G201
Behind the I/P, on the LH side of the brake pedal bracket
G202
Behind the I/P, in the center
G203
Behind the I/P in the RH side of the brake pedal bracket
G301
At the base of the LH B-pillar
G302
At the base of the RH B-pillar
G309
On the RH side B-pillar

That is the water pump bypass/heater hoses you have to get them from the dealer, they know the ones. They are plastic and you should replace both and make sure you get all the pieces out as they will break when removed.

do you have spark if you have no spark the crank sensor is bad.do you have fuel presure now. if not check the fuses. nead more info