A compression check will not always verify a leaky head gasket on a Northstar engine. Most of the time these head gaskets fail due to faulty head bolts. The threading on the bolts slowly pulls out of the engine block, creating a gap between the head and the block, allowing combustion fumes, oil, and coolant to mix together. One thing you can do is check your oil. A leaky head gasket will make your oil look like foamy chocolate. Also, you can take the cap of your coolant reservoir, start your car, and look for bubbling or "false boiling". Excess pressure in the cooling system caused by combustion fumes leaking into it causes this, which would also signify a leaking head gasket.
how can you tell if you need a radiator in a 99 cadillac northstar engine
Where is the radiator drain plug for a 1995 Cadillac Seville 32valve northstar 4.6litre V8
waterpump or radiator hose
The easiest way to drain the coolant on a Northstar is to pull the lower radiator hose off. There is a petcock on the lower left (driver side) of the radiator but it's almost impossible to get to without a special tool.
when overheating occurs at highway speeds the cause is usually. a radiator or coolant circulation problem, Check for a restricted or clogged radiator.
follow the top radiator hose to intake
try a radiator cap......or you have a head gasket leak.
Check coolant level Replace radiator cap Radiator may be clogged Make sure air flow through radiator is not resitricted
the thermostat is usually located were the top radiator hose connects to the eng
it can..rain has NOTHING to do with your radiator or the thermostat
I have a '98 STS with the Northstar and was recently on Cadillacforums.com and the same question was asked about the northstar and alternator. From what I remember, You have to take the right radiator fan out, take passenger side tire off, I think remove the black plastic (might be in the way) and you should be able to get at it from there. word of caution though, watch you dont bash the radiator in when you turn it to get it out.
On the 2.7L it is under the housing where the lower radiator hose attaches. On the 2.4L it is under the housing where the upper radiator hose attaches.
Should be in a removable housing at the engine end of the upper radiator hose
Will a 99 Cadillac deville radiator work in a 2000 Seville
In a housing that attaches to the water pump at the rear of the engine. Follow the top radiator hose down to the water outlet on the engine. The stat is in the water outlet. AT THE END OF THE UPPER RADIATOR HOSE ( ENGINE END)
The theromstat is directly under the thermo housing at the end of the top radiator hose.
theromstat housing on the back not the front
The 1996 Cadillac STS Radiator does not have a drain plug
possible radiator resrtiction
There is no condenser on a Northstar engine - they're all a completely electronic and computer controlled ignition system. However, if you're referring to an air conditioning condenser, there will be one - it will be mounted in front of the radiator.
How to change radiator on 94 eldorado
The easiest way is to pull the lower radiator hose. There is a petcock on the bottom of the radiator, but it's a pain to get to without a special tool. Pop the hose and you'll get about 85% of the coolant out. Have a large drain bucket handy. Make sure the engine is cool.
If it a similar model, yes
You have to pull the lower radiator hose to drain/flush the radiator