Overheating on LQ-9 Swap
Good to know that's not the issue. I liked where you were going with a radiator that is having flow issues. Do you have another radiator you can try as a test? I think that would be my next step.
Thread Starter
Teching In
Joined: Aug 2018
Posts: 23
Likes: 1
I don't think it is a radiator coolant flow issue, it is an airflow issue across the radiator while driving. Airflow through the compartment isn't designed well on older trucks and I have a feeling they relied on mechanical fans to always be aiding in air flow. The electric fans and shrouds are the biggest change I made to the cooling system from the factory toyota one.
TECH Senior Member
Joined: Jul 2009
Posts: 8,034
Likes: 663
If the radiator was designed for a 6 cylinder, it very well could be too small or not deep/thick enough. Regardless how much airflow it gets, it might not be good enough. Also,…… you could still have air in the system.
some people have a hell of a time purging the system while other don’t
some people have a hell of a time purging the system while other don’t
Last edited by Jimbo1367; Aug 19, 2021 at 10:07 AM.
Thread Starter
Teching In
Joined: Aug 2018
Posts: 23
Likes: 1
Alright so I came home today and pulled the shroud and fans. I drove the same route I did yesterday. It is cooler today. Only 80F. But it never went over 175F! So now I know the problem is my shroud design. My photos still sent getting approved to post but here are links to my shroud design if anyone has any input. Basically just enough room for the two fans and flaps along the top.
https://ibb.co/c6LgKY0
https://ibb.co/c6LgKY0
https://ibb.co/c6LgKY0
https://ibb.co/c6LgKY0
Last edited by Michael Yount; Aug 19, 2021 at 08:16 AM.
Glad you got it figured out. Like Michael said, look into adding some flaps that will open at speed. Luckily the C7 fan that I just swapped on my car has those flaps built into the shroud. Not sure if you have the ability to control a PWM with your setup, but if you do, the C7 is a great option and is fairly inexpensive. It's a brushless SPAL fan that flows around 3k CFM.
Thread Starter
Teching In
Joined: Aug 2018
Posts: 23
Likes: 1
Glad you got it figured out. Like Michael said, look into adding some flaps that will open at speed. Luckily the C7 fan that I just swapped on my car has those flaps built into the shroud. Not sure if you have the ability to control a PWM with your setup, but if you do, the C7 is a great option and is fairly inexpensive. It's a brushless SPAL fan that flows around 3k CFM.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
TECH Addict
Joined: Oct 2016
Posts: 2,513
Likes: 480
From: PDX-OR-USA
Do you have a CJ or a Cherokee? I have known a few guys with Cherokees to use hinge spaces to kick the hood up and allow hot air to travel more freely out from under the hood. Some of the FJ80 land cruiser guys will add vents on their hoods, but I don't really care for the look. Most of them are reporting at least 10 degree engine temp drops through.