I have a 92 Daytona IROC R/T and I posted a few weeks ago this:
Today turned into an eventful lunch break in the 92 Daytona
I am sitting at a light and I hear a buzzer, look at the dash and see my coolant temps are really high, almost pegged the gauge. So I shut the car down, wait for the light, fire it up and get to Target which is a block away, by the time I get there its getting hotter. I roll to a stop and then I hear sizzling. I pop the hood and there is steam all over. The fan is not running, I check the fuse and relay, both are good, so I go jiggle some wires and check the plug on the fan itself. Then I drop the hood go into the store and get some distilled water. Come up, pop the cap for a nice gusher. Then add water, no leaks so I fire it up and start driving back to work. Blast the heat on high and vigilantly watch the water temp. It goes right back to normal. Drive to a gas station, pop the hood and the fan is ON. Back at work now and I hope this was just a fluke..
So since then I have not driven the car that much and anytime I drive it the car gets hot.
Last night I was borrowing my buddies coolant funnel that you attach to the radiator cap and fill the funnel, this works well to remove any air bubbles from the system. Well I fire the car up and start warming it up. I let the car get hot, temps rise to 180, then 190, then 200. Temps just keep on rising. Then I blip the throotle and the revs hang up. I blip it a couple of more times and the revs keep climbing. It is idling at roughtly 4000 at this time. coolant temps are nearing 210. Fan never comes on. I kill the car coolant overflows the funnel and dumps all over.
After cooling down and draining some of the coolant, I pulled the thermostat, put it in a pan of water, the t-stat didnt open till 205..
Checked the waterpump and it spins freely, I replaced the pump a few years back.
I just can't keep this car cool anymore, what could it be? Is my thermostat shot? What else would cause this? Outside temps were around 70.
I am putting in a new thermostat today, and I ran a secondary auxilary switch into the car to operate the clutch relay if the ECU is not turning it on. I am running a boost button flashable ecu chip.