I normally do drain the cooling fluid , but do I have to when I take the upper plenum off ?? or is it above the static level.

 

You might not have to drain all of it, but I would drain at least 1/2 just to be safe. Someone correct me if I am wrong.

 

For VG or VE?

the VG has some coolant in it, but I didn't bother draining the system- just pulled the hoses off and let the small bit dribble out. keep the hoses propped up though- if you bend them down and out of the way, they'll siphon out coolant until the level is as low as the end of the hose.

for the VE, there's no coolant passages in the IM, except for the one going through the throttle body.

 

VG , and I will be keeping the throttle on the car (disconnecting it from the plenum.)

 

Why?,you will just have to buy another gasket then. It would be easier to remove the intake as a whole.

 

got to clean the throttle body anyhow. what I meant was that I would leave the elbow behind. so I wouldn't be removing the coolant hoses there and therefore wondered if I could save my lazy as some work by not draining the coolant first.

 

not that lucky on the VG.
there's coolant running through both the TB and the intake mani on the VG.

 

yep the coolant goes into (or out of... can't remember) a port just below the pcv valve hookup and there's another one somewhere else that is the outlet (or inlet, depending which direction it flows, since i forgot by now) that you have to disconnect as well. they are fairly close to each other, ie, maybe 4 inches apart.

 

noob question. why does the tb have a coolant line. i wouldnt think it would need one.can they be diconnected. if so would it be a benifit to disconnect.

 

coolant lines to the TB are to keep it from icing up.

 

would it make any sense to block it off during summer months to keep it cooler.

 

I've had my tb coolant lines blocked on my VE for many years,no problem where we live.

 

I hear the coolant lines in the TB are an emissions thing to help the warm the air and motor asap. I dunno

 

Nah, It's more of a precautionary thing so in colder climates (Sub Freezing) your butterfly plate doesn't get stuck open/closed.

 

it does a bit of all of the above. it's there for more than one single reason.. but it really doesn't make a difference in how the car drives. I noticed no difference when I did it on my car.

 

me either. my gas pedal is the smoothest travelling pedal i've ever stepped on. even my mom's 99 camry 2.2 has a notchy pedal.. even AFTER i thoroughly cleaned the TB on it. and her coolant thingy still goes through her TB. or so i assume. i assume that engine has that feature.

anyhow, i have no coolant flowing through my TB or my UIM. and have noticed no harm. car still squeals tires off a light with a slushbox so i'm happy.

 

I had my 240's throttle body coolant bypassed last year when I lived in chicago over the winter, no problems at all.

Best thing to do is keep it clean with a old tooth brush, carb cleaner and a rag/paper towels.

~Alex