I've replaced the thermostat already. This thing runs COLD. Never gets remotely warm. If you let it idle for a long time it gets lukewarm. Is this a common problem?

92 SE with 85k miles or so.

im wondering if you got all the air out of the system when you replaced the thermostat, or the new thermo is bad....BillBoost knows all about that

When you installed the new thermo stat...did you open the bleed screw while filling, then close it..start car and run w/the bleeder open until all the air was out?

Then you close the bleeder...drive the car 1/2 hour or so and check the bleeder again..

what about the hose tee by the heater core would that be a problem also if it was leaking?

jus realized no cause he would have a leak on the ground

1. Is your heat warm?
2. what does your guage read at?
3. What are you running for a thermostat?
4. Is your blower motor or cooling fans running constantly?

And being a bonneville there is no T

I had the same thing happen, the T-stat was bad out of the box. Took it back, got another one and the problem was fixed.