my buddy just put a new rad in his FD, when the car is cold and do start up with the filler open u see these tiny little bubbles . if it needs burping will the bubbles be bigger?

 

assume it needs burping , but if it continues . then a pressure test may be needed .

is it smoking ?

 

We also didnt use a no spill funnel, were going to try it again when it comes in. The pressure test iss done by usingwhat and what and where are we llooking for?

 

Cooling System Test Kit | AutoZone.com <-- use something like this . you can normally rent them .. and as for the PSI i'm not positive what its supposed to be at , but basically you pressureize the system and see if there is a leak . if there is .. well ... you know .. usually means bad things. but make sure the leak isnt from a hose . I had a coolant leak and I freaked out but I found it it was the throttlebody hose that was bad.

 

Are the tiny bubbles constant? Do you see more when RPMs increase? Possible weak coolant seals.

 

when the temp gets hi and the fan turns on I see some bubbles. when it cools down and the fan stops there is no bubles

 

Thats more then likely the Thermostat opening and closing.

have you guys had any issues with it losing coolant? still? or smoke?

it may just needed to get the air out of the system .

 

no smoking,no overheating and no funny smell from exhaust. but coolant level never stays the same after heat up and then cool down

 

how-long has it been happening? it took about 2 weeks for me to get all the bubbles out of my system when I swapped the radiator.

 

You got a temp gauge? What temps are you reaching?

I wouldn't worry about it until you get a chance to do the pressure test.

 

its hard to say cause the car isn't driven much and this weekend we are putting the pettit 185F thermo switch in and a 180 deg thermostate. so we will be starting from square one again

 

last time we burped it with the no spill funnel, I snaked a temp probe in the funnel down by the low water sensor.it reached like 205 and fans kicked in

 

96C thats about normal for the fans to turn on .

I would invest in a real Temp gauge not that idiot light mazda put in a temp gauge's place .