Cadillac Seville / Cadillac Eldorado Forum Discussion, cooling issues in Past Cadillac Vehicle Discussion; Ok caddilac gurus I'm still having cooling problems I'm not car illiterate but I've never seen a head gasket leak ...
Ok caddilac gurus I'm still having cooling problems I'm not car illiterate but I've never seen a head gasket leak internal or external that you don't loose fluid so I took the t stat out and the temp still went half way up the gauge and check coolant level came up the overflow was full if gaskets need replaced are these thread serts or studs required and do you really have to pull the engine to change them please no smart comments I admit the northstar is foreign to me but I've bone a lot of auto repair from tranny rebuilds to motor rebuilds thanks for you're time
"Half way up the gauge" is normal. Is the car overheating?
If the surge tank is "full" (half way up?), and the CHECK COOLANT LEVEL message is coming on, the float in the tank is stuck. You might be able to free it by removing the tank, filling it with hot water, and shaking it. Otherwise it will have to be replaced.
If the heads are removed, you ABSOLUTELY need to use studs or inserts in all 20 head bolt holes. It is possible to insert the block with the engine in place, but much more difficult, risky, and not recommended. Studding is not possible with the engine in place, there is not enough ro to get the rear head over the studs, the firewall would be in the way.
.......... and a Northstar will not cool correctly without the proper thermostat in place. Yes, you MUST insert/stud all 20 cylinder block head bolt holes. The drilling, tapping, inserting and total cleanup will take a dedicated long day's work - that's AFTER the engine removal and preparation work. The GM shop rate is 22 hours in a shop with all the special tools, fixtures, parts and experienced techs. You will need a real GM/Helm shop manual because of all the special techniques, torques, and assembly procedures. A Northstar in no way resembles a Chevy 327.
I'm having a sale on punctuation, spelling, grammar, and capital letters.
stealth92, You might want to read the 4 threads - the sticky threads - in the Engines, Northstar Performance forum. Cooling system, temperature gauge, and Northstar head gasket failures - and repair procedures - are discussed at great length.