picked up a 93 caddy sls that apparently has dirt dauber nest in the cooling system.

a big fat one plopped out of the overflow when i had the cap off and the car was running and it started to boil.

whats gonna be the most effective way of flushing these things out of the cooling system?

A water hose and an air compressor

how do i do the air compressor part?

never had to dick around with cooling systems past basic fluid changes lol.

Use an air nozzle and use tape/rubber/whatever to make a seal. Pop it with a little pressure after you fill it with water. You are going to be flushing for a long time.

oh okay i see now.

should i pop out the thermostat or anything like that?

i've ran it some like and it stays ~operating temp i'm just super worried its clogged up time bomb lol.

It wouldn't hurt. Flush it both directions. Unhook the lines to the heater core so you don't blow trash in there.

alrighty thx. i'd just risk it but it seems a shame to kill this northstar lol.

gotta do this and then figure out why its shaking @60mph+ then it can be someone else problem lol.

I use a shopvac for coolant flushes.

Fill basin with water
Put basin under disconnected lower rad feed
Fasten vac hose to upper rad hose
Set that bitch to blow and let it run supervised for 5-10 minutes.

If you get that bitch even slightly hot say bye bye to the head gasket.

yeah i think ima go take some coolant to get tested so i can see if it did fuck it up. oil doesn't seem to have any issues though.



don't has a shopvac! just a big ol air compressor and a water hose lols.