Re: TB coolant crossover,any disadvantages?
 

It appears that there are six threaded plugs we are talking about to eliminate ALL the hoses (including coolant bypass hose) all the way back to tank. Four on the plenum and two on injector housings. They all look like 1/8 inch pipe thread to me....is that correct? I assume you simply cut off the existing hose fitting and drill the remainder of the fitting out of the plenum tapping with 1/8 inch pipe tap.

photos provided by Ccmano
http://i287.photobucket.com/albums/l...assplugged.jpghttp://i287.photobucket.com/albums/l...oolantplug.jpg

Simply cap off the bypass hose at the tank as Ccmano says eliminating that TB bypass hose going from "T" on passenger side of engine to tank also.

Re: TB coolant crossover,any disadvantages?
 

Would it be better to use aluminum pipe plugs instead of brass or stainless?

Re: TB coolant crossover,any disadvantages?
 

So, old thread. When i replace my plenum, can I remove the pressed in fittings and eliminate those lines?

Re: TB coolant crossover,any disadvantages?
 

Yes, you can. If you wanted to take it one step further, you should plug the water passage in the injector housing before it enters the plenum. This will eliminate the need to drain the coolant down to do any future plenum pulls.
Rich

Re: TB coolant crossover,any disadvantages?
 

See Item #4 LT5 Eliminated Systems

As Scrrem shows above The associated two IH coolant ports in the IH should also be plugged on each side.

Photo by Ccmano
http://i287.photobucket.com/albums/l...55797df488.jpg

Total six coolant ports plugged One each side TB, One each side Plenum, One each side Injector Housing.

See (Filling With Coolant and the Air Locked Water Pump) for Detailed New Coolant Filling Trick.

You do not have to wait over night Hoping you heated the water pump area up enough to draw coolant into the area of the water pump impeller by running without coolant flow the night before. I used this proceedure to make sure I did not have an Air Locked Water Pump which has nothing to do with TB Coolant Blocked since this proceedure was used before I ever blocked my TB Coolant ;)

http://i287.photobucket.com/albums/l...enumblockN.jpg

Remove TB Coolant hose and tubing left and right side of plenum and plug hose return to coolant tank passenger side See Brass Cap just above the "T" On Passenger Side. Initial Coolant Fill may be somewhat affected by the TB Coolant Elimination (see item #4 Initial Coolant Fill). The "T" connects the top of the radiator Air Vent, TB Coolant Return, and Coolant Reservoir in front of Passenger side. With the TB Coolant Return Blocked, what is left is a coolant line from the Radiator Air Vent to the Passenger Side Coolant Reservoir.

http://i287.photobucket.com/albums/l...666a77e43d.jpg

1990 LT5 with TB Coolant Eliminated
http://i287.photobucket.com/albums/l...b1ba5026d5.jpg

1991 LT5 with TB Coolant Eliminated
http://i287.photobucket.com/albums/l...510aaf14f2.jpg

Re: TB coolant crossover,any disadvantages?
 

What are the down sides to this? Other than the freezing issues I've read about.
Drill, tap and plug the holes? -Steve

Re: TB coolant crossover,any disadvantages?
 

None :p

Marc has found that the throttle body (TB Coolant Blocked) has no problem with ice when the ambient temperature is at 20 degrees and the humidity is 90% :cheers:

As discussed in......Throttle Body Heat Bypass Line

I do not use a Bypass Line on either a 1990 and a 1991 with NO issues.

Re: TB coolant crossover,any disadvantages?
 

So just yank the lines and plug the holes?

Re: TB coolant crossover,any disadvantages?
 

Do not "yank the lines" but rather remove the fittings carefully so you do not break them off making that removal more difficult.

Actually the cause of the Air Locked Water Pump is not related but a Coolant Refill Proceedure that has worked every time for me for the Air Locked Water Pump has been defined. This applies if in fact you drained ALL your coolant at a level BELOW the Water Pump (TB Coolant Bypass blocked or not).

See (Filling With Coolant and the Air Locked Water Pump) for Detailed New Coolant Filling Trick.

You do not have to wait over night Hoping you heated the water pump area up enough to draw coolant into the area of the water pump impeller by running without coolant flow the night before. I used this proceedure to make sure I did not have an Air Locked Water Pump which has nothing to do with TB Coolant Blocked since this proceedure was used before I ever blocked my TB Coolant ;)

Marc has installed the TB Heat Bypass Line as a precaution for those he is not sure about their "do it yourself" skills in dealing with coolant issues.

But you have to confer with Marc on the need for the TB Heat Bypass :p

Re: TB coolant crossover,any disadvantages?
 

Major thanks Dyno. I'll go through all the finer details when I have a chance, like reading up in the (your) solutions.

Scrrem, what did you use for plugs?