98 GTP Temp Fluctuation

"Matt Mayer" wrote

There may be some air in the cooling system.

Ian

Air in the system. You should have a bleeder valve on top of the water neck. Keep your overflow bottle filled to hot mark as well.

Air in the system. Get it out before the cooling system rots.

Thanks guys. That;s what I thought, but I figured I would ask the experts. Now the next question, bleed it hot or cold? Or does the car just need to be running so there is pressure in the system?

Thanks again,

---Matt Chicago, Il

I believe that you want to bleed the coolant while engine is hot & running. The thermostat should be open. The heat set on maximum also. The car should be on level ground also.

-- markwb

How long do you leave the hot engine running without coolant?

You're not running the engine without coolant at this point. The cooling system should be filled to normal capacity. The object of bleeding is to vent air out of the system so that the cooling system is solid. the vent path is usually at the high point in the coolant loop. The thermostat should be open to ensure complete flow through eng, rad & htr core.

-- markwb

"Matt Mayer" wrote

At this point, all you probably need to do is to check the level in the radiator when the engine is cold. Top up the radiator with the engine off. Make sure you have the overflow bottle filled up to "hot" level even though the engine is cold. Take it for a drive...see how the temp gauge responds....let it cool down. Then recheck the level in the radiator and the overflow. It never harms the cooling system to run the overflow bottle at a higher level then the marks specify.

It should suck in any remaining coolant that it needs on the cool down cycle. If not, you may need to replace the radiator cap.

Ian

Thanks all for the tips. I'll work on it tomorrow and let you know how it turns out.

Tired bleeding it twice (once at work, once at home.) Opened the screw on the Thermostat housing and got DexCool right away both times. No Air. Any other thoughts?

Thanks!

The trapped air that was mentioned is no doubt someplace within the cooling system, not in the thermostat housing.

Good Luck.

========= Harryface =========