I have read a lot of the other posts about over heating and most seem to apply to getting hot at idle or low speeds. My 1989 FJ62 starts getting hot at highway speeds. It has a 6.0 LS in it for reference and I have run this set up for 12 years now. Here is what I have done so far to try and fix the issue.
1. New Mishimoto aluminum radiator (stock rad had small leaks in it, I did have it repaired and it is in storage, but it had the same symptoms with the stock rad)
2. New Thermostat (187 degree)
3 Running the same electric dual Spal fans since the engine swap. Motor stays cool (200-205 degrees or so at a stop sign in 95 degree weather after driving)
4 Relocated supplemental trans cooler from in front of the radiator to possible improve flow (made no difference)
5 Removed the Warn 8274 (made no difference)
6 Flushed the motor and new radiator, when draining the fluid was pretty clean.
7. Put a spring in the bottom radiator hose to prevent collapse
I have been messing with this for over a year now. One interesting fact is that if I am sitting at idle, fans on and truck at about 200-205 degrees, if I rev the engine to about 2000-2500 RPM the temperature goes down very quickly to around 190. The water pump is stock, but it is not leaking and seems to be functioning as it should.
Around town with stop and go traffic, it usually stays right around 200-205.
In the summer, at 70 MPH (around 2300 RPMs) it will creep up to 240 +. At that point I slow down, turn off the AC and then it cools pretty quickly below about 55 MPH. Hills make it heat up much faster of course.
I do not take the Cruiser on many highway trips, but plan to start getting it out more. I was thinking of maybe just replacing the water pump for kicks. Maybe go with a high flow pump?
Any suggestions or first hand experience would be appreciated, thanks.
1. New Mishimoto aluminum radiator (stock rad had small leaks in it, I did have it repaired and it is in storage, but it had the same symptoms with the stock rad)
2. New Thermostat (187 degree)
3 Running the same electric dual Spal fans since the engine swap. Motor stays cool (200-205 degrees or so at a stop sign in 95 degree weather after driving)
4 Relocated supplemental trans cooler from in front of the radiator to possible improve flow (made no difference)
5 Removed the Warn 8274 (made no difference)
6 Flushed the motor and new radiator, when draining the fluid was pretty clean.
7. Put a spring in the bottom radiator hose to prevent collapse
I have been messing with this for over a year now. One interesting fact is that if I am sitting at idle, fans on and truck at about 200-205 degrees, if I rev the engine to about 2000-2500 RPM the temperature goes down very quickly to around 190. The water pump is stock, but it is not leaking and seems to be functioning as it should.
Around town with stop and go traffic, it usually stays right around 200-205.
In the summer, at 70 MPH (around 2300 RPMs) it will creep up to 240 +. At that point I slow down, turn off the AC and then it cools pretty quickly below about 55 MPH. Hills make it heat up much faster of course.
I do not take the Cruiser on many highway trips, but plan to start getting it out more. I was thinking of maybe just replacing the water pump for kicks. Maybe go with a high flow pump?
Any suggestions or first hand experience would be appreciated, thanks.