Question about 2003 Buick Rendezvous
Engine temp will bounce from cold to hot(red line). I've replaced the thermostat and coolant temp sensor and am still having problems. I may or may not get any heat in the passenger compartment. I attempted to check to see if there were any compression gases mixed in with the coolant using a detection leak it. However, I wasn't able to verify because coolant kept bubbling out of the radiator and mixing with the detection fluid. I'll be replacing the water pump next. Any other suggestions as to next step or am I out of luck and will need to replace the head gasket?
Don't change the pump or anything else until you have carried out the basic checks to establish what seems to follow all the usual symptoms of a head gasket failure. Remove all the plugs and carry out a cylinder compression test. They should all be within 5% of each other. Its likely you will have 2 readings next to each other that are low or nil. Note if any coolant is spat from any cylinder when cranking. Then, with the coolant topped off, pressure test the water system with the appropriate test kit and see if the pressure holds. My guess is it won't. Don't guess at the problem, carry out a sequence of tests and usually all will be revealed. Coolant gases can be carried out after running.
Posted on Apr 17, 2017
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Posted on Jan 02, 2017
first check to make sure the cooling system is not air bound,takes a while to bleed off the air,try this and get back to me Thanks Ray
Posted on Nov 13, 2009
SOURCE: 03 Buick Rendezvous Overheating
If the top hose is hot and the bottom is cold, your definitely not getting circulation. You,ve already done alot of work to this vehicle so you have pretty much answered your own question. About the only thing left is the heater core. Of course, I dont want to be the one to tell you it is definitely the heater core because obviously I am not looking at the vehicle. But If i was a betting man, thats where my money would be.
Posted on Dec 14, 2009
SOURCE: Replaced the water pump on
YEP YOU HAVE LEAK AT THERMOSTAT HOUSING.YOU NEED REMOVE THERMOSTAT HOUSING OUTLET AND CLEAN THE MATING SURFACE THOROUGHLYTHEN APPLY RTV SEALANT IN THE GROOVE OF THE WATER OUT LET HOUSING.INSTALL THERMOSTAT WITH SPRING TOWARD THE ENGINE TORQUE THERMOSTAT OUTLET HOUSING BOLTS 89 INCH LBS.IF STILL LEAKS OUTLET HOUSING COULD HAVE CRACK IN IT CAUSING LEAKING.
Posted on Sep 08, 2010
cylinder head gaskets, or cracked cylinder heads, this is a bad problem with the 3400 engine, so bad that we keep a set of heads in stock at the shop.....SORRY
Posted on Nov 14, 2010
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