Question about 1998 Cadillac Catera

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Cant find thermostat

First off car got overheated b-4 I received it .I tried to dive it about 15 miles to get it to my parents house so i could work on it in dads shop.I alnost redlined and it cracked the radiator and I have oil in the water overfllow.There is also oil on the inside edge of the oil spout where you fill it with oil. But there is no water on dip stick . Blown head gasket or head ? Please help me Thank You Cowgirl

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You did not blow a head gasket. The white under the oil cap is normal because it sits up so high. My GM dealer told me this.
As far as the oil in your coolant..It is your oil cooler that has busted. This is a common problem on Cateras. It is located underneath the intake..between the heads. Easy to change once you get the intake off. And, your thermostat is under the intake also, so change it while you have it off. I have a 1998 Catera..Been there..done that.

Posted on Jul 31, 2010

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Most likely the heat warped the head allowing the head gasket to blow out. The head will have to be removed and checked out.

Posted on Jul 17, 2010


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Disconnect negative cable from remote jumper terminal

Drain cooling system.
Remove accessory drive belt for removal of the generator.
Raise vehicle on hoist.
Remove generator attaching bolts. Set generator aside for ease of access to thermostat.
Remove lower radiator and heater hoses from thermostat housing.
Remove thermostat housing bolts Thermostat and Housing - 2.7L Engine
Remove thermostat and housing.
Clean gasket sealing surfaces
NOTE: Install thermostat with the bleed valve located at the 12 o'clock position.

Install thermostat and gasket into the thermostat housing.
Install thermostat and housing to cylinder block. Tighten attaching bolts to 12 N·m (105 in. lbs.) Thermostat and Housing - 2.7L Engine
Connect heater and lower radiator hoses. Install hose clamps.
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Lower vehicle.
Install accessory drive belt. Refer to procedure outlined in this section.
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Connect negative cable to remote jumper terminal.

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It's in the housing you described..

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