2009-2013 Cadillac CTS-V Performance Mods Discussion, Wait4me Heat Exchanger Questions in Cadillac CTS-V Series Forum - 2009-2013; I installed the wait4me heat exchanger this weekend. On initial fill it took a little less than a quart of ...
I installed the wait4me heat exchanger this weekend. On initial fill it took a little less than a quart of fluid. I drove it a while and bled the system. After that it took an additional quart of fluid. My IAT 2 temps were around 150 on highway driving which seems high to me. It took some more fluid this morning. My questions are:
1. How much fluid does the wait4me heat exchanger hold?
2. Did anyone else experience high IAT 2 temps prior to the system being completely topped off?
I'm sure I will be adding fluid for the next couple of days but I wonder if I don't have another issue. The "S" hose was pretty tight and looked like it pinched down some at the turns. I assumed that when the system pressurized it would help pop the hose out. Over trimmed it a little to make it fit better. If the temps don't decrease maybe the tube is causing a restriction? I know the system is still flowing because the fluid is moving and the air bled out. Thanks in advance for the help.
For some more info from the drive in to work this morning. Ambient temp was 55. IAT 2 temp was 84 to start. My drive to work is all highway at 70 mph. Did a run up to 120 getting on the highway. IAT 2 jumped to 120 and then settled around 98. Did another run at a stoplight and it jumped to 140 and settled at 106. Did a third run and it jumped to 160 and settled at 114. About 5 minutes between runs and took about 3 for temps to stabilize. When I got to work I checked the coolant level and the overflow was empty again. I'm going to add more once it cools off. I never did check the IAT 2 temps before I added the wait4me heat exchanger so I don't have a good frame of reference. What are you guys experiencing?
Sounds like you didn't fill / purge the system right.
The stock heat exchanger has a port on the driver side top that can be opened to bleed out all your air. It takes a 3/8 ratchet head..
Also, the s hose can be cut down on each side to make it a smoother bend for your car. Every car is different in that area so we leave them longer on purpose so you can cut it down to match your exact vehicle depth..
You have the stock one there in place still and mine as an adder. If things are bled correctly, there are no situations where the stock setup would be better.
I did bleed the valve on the stock exchanger until just fluid was coming out. I know the system is not full of fluid yet. When I got to work it was low again so I think that is part of it. I doubt that the hose is much of an issue because the system is still flowing.
What are typical IAT 2 temps that I should be seeing for 60-70 degree ambient temps?
How much additional fluid does your heat exchanger hold?
Those values are because you have air in the system. If you bleed a system then it should not have air left in it.
You have to have the pump running when you bleed the stock exchanger. it will bubble out coolant for a while.
I usually start and stop the engine several times, until it is a steady stream of coolant that comes out when opened.
If you're making changes to flow in the IC circuit and you're seeing IAT2 temps reacting to these changes during cruising, you may have an issue with your bypass valve. The IC circuit is not in play during cruise mode - it only affects IAT2 temps when in boost. During cruise, IAT2 temps should be a little higher than ambient, depending on the temperature in the plenum, which is heated by the engine. With your setup and current ambient temps, I would expect IAT2 temps in boost to stay under 150.
Alright. I trimmed the upper tube and rerouted the lower. The lower was pinched almost shut somehow which I think was most of the problem. I then filled and ran it with the passenger side jacked up to get the air out of the new heat exchanger. Then I lowered the car, topped it off, and bled the system. It took an additional gallon which was way more than it took before when I topped it off. Took it out ad made some runs. Two runs with a couple minute break in between. It got up to a high of 152 and quickly dropped to 115 on the second run. First run it got up to 140 and dropped down. It was already heat soaked from being in the garage running. Ambient temp was 78.
Alright. I did some more runs this weekend. It's still hitting IAT2's of 160 at around 130mph at WOT with ambient of 65 degrees. IAT2's at cruising are around 100 degrees at the same ambient. Is this typical? If not, do you think the pump could be bad? Maybe there is air in the inter cooler brick? What do you think?
The other mods I have are a 2.55 upper pulley, wait4me intake, and wait4me tune.
I imagine the supercharger is making more heat with the 2.55 pulley.
I bought a Mityvac MV4535 and used it to suck the air out of the system. Got a ton of air out and added another half gallon to the system. IAT2 temps now stay between 80-85 while cruising and only got to 100 during a 20-100mph run. Ambient temp was 65.