With the Summer months and Heat in full effect, How hot is too hot?

[CPRsm]

Nooooooooooo, don't pull it out. If you can't get it down to 160 there is no reason to have it in there at all. It is just keeping the t-stat open and makes it harder for the car to stay cool. Put in a 180 and you should see a difference. When the t-stat is open the whole time or is taken out the coolant isn't in the radiator long enough and it can't draw the heat out fast enough to stay cool. Having a t-stat in too low is harder to cool because it is closer to ambient temps. The closer it is, the harder it is too cool. The bigger differential you have the easier it is to cool.

 

[Weou09]

I am not to familiarized with the coolant system on our cars but I know I had a lot of problems out of both of my 4.0 Cherokees with flowing the coolant to fast and not having enough dwell time to dissipate heat. A higher speed dual fan setup with the stock 180 degree tstat with a 3 row radiator did the trick on them for the hot days with long trail rides.

 

[wht67]

Last summer I had issues with the temp going up and even puked coolant one. Turned out that the stock fan connector melted and was intermittently cutting the fan off. Replaced the connector and fixed it up.

 

[JeremyH]

I believe I sent you my fan connector didnt I? lol

 

[tmcolegr]

I know you said the fan was running, but was it running on low or high speed? It's possible that POS resistor on the back of the fan shroud has failed and even though the fan was running, it was only running at high speed when the coolant temps got high enough for the PCM to command the high speed fan come on.

 

[94tbird]

Nooooooooooo, don't pull it out. If you can't get it down to 160 there is no reason to have it in there at all. It is just keeping the t-stat open and makes it harder for the car to stay cool. Put in a 180 and you should see a difference. When the t-stat is open the whole time or is taken out the coolant isn't in the radiator long enough and it can't draw the heat out fast enough to stay cool. Having a t-stat in too low is harder to cool because it is closer to ambient temps. The closer it is, the harder it is too cool. The bigger differential you have the easier it is to cool.

you cannot move the coolant too fast. Its simple fluid mechanics. The faster it moves the better.

I am not to familiarized with the coolant system on our cars but I know I had a lot of problems out of both of my 4.0 Cherokees with flowing the coolant to fast and not having enough dwell time to dissipate heat. A higher speed dual fan setup with the stock 180 degree tstat with a 3 row radiator did the trick on them for the hot days with long trail rides.

You may have had another issue, or changing to a better fan helped you there, but the problem wasnt the cooling moving too fast.

My coolant has been moving at this speed for almsot 6 years, with the 160tstat, i only recently started to have a problem.

Last summer I had issues with the temp going up and even puked coolant one. Turned out that the stock fan connector melted and was intermittently cutting the fan off. Replaced the connector and fixed it up.

That is definately something i will check. I noticed I had a small burn mark on one of the pins for the high speed fan relay, so i swapped it with another relay. The fan connector may also be hosed. Thanks! Ill check tonight

I know you said the fan was running, but was it running on low or high speed? It's possible that POS resistor on the back of the fan shroud has failed and even though the fan was running, it was only running at high speed when the coolant temps got high enough for the PCM to command the high speed fan come on.

That is a great question. I do not know if the low speed fan was running. It can be very possible it is not. If the low speed was shot, would i need a whole new fan? or can i just change the resistor?

 

[JeremyH]

Normaly its just the resistor that goes bad on the fan shroud.

This guy:

 

[94tbird]

can that be bought separately?

 

[JeremyH]

Yeah I think so. Mine went bad so I found a lightly used one here off the fourms for cheap.

 

[94tbird]

hmmm. I dont see it on Rockauto or Tousley ford. Gonna have to call

 

[94tbird]

wait i think i found it.

Can you go here and verify?

http://www.tousleyfordparts.com/par...5080&callout=5&catalogid=2&displayCatalogid=0

in case link doesnt work #5 on this diagram

 

[JeremyH]

Yup thats it!

 

[94tbird]

if i pull mine out, is there an easy way to tell if its shot? will it be burned up or something?

 

[JeremyH]

Not always mine looked rather okay from the outside. But my high speed fan would not come on at all. I would first check the fan to ensure low and high speed come on. Just start the car and wait lol or you can set the fan settings really low with your tuner. Ive always been told to to keep the low speed fan close to or right above t-stat temp and then high speed set 10-12 degrees higher than that.

 

[94tbird]

im going to play with that tonight. set the low speed fan as low as it will go. i think thats 170. Set the high speed fan to 180.

Im gonig to check the connectors as well to see if theres any burnt connectors or damage.

 

[94tbird]

Thanks for the help man!

 

[JeremyH]

No prob, soudns like a plan yeah I played with my fan speed settings for a good week to get them exactly where I liked.

Basicly its set so as the car warms up from a cold start (t-stat closed) right at the pause where the t-stat fully opens and temp lingers (174ish on my water temp gauge) I then set the low speed fan to 176 I believe. This way any driving above 25mph really keeps the car at 178-180 and only needs the low speed fan to keep it there. Then high speed is at 190 so if i come to a stop for abit an idle the temps will slowly creep up to 190 then the high speed kicks on for like 20 seconds and the car drops temp and will sit at 188-190ish while idling.

 

[kevinatfms]

ford had a big problem with the town car fans and fan resistors back from 2000-2007 or 08 but its the same fan design and resistor design as the mustang.
the tsb fix was to replace both the fan and resistor as an assembly with an update part.
if i can find that tsb ill try to send it to you and see if the symptoms listed are what you are having...

 

[94tbird]

lease see if you can finds it. That would be great!

 

[CPRsm]

you cannot move the coolant too fast. Its simple fluid mechanics. The faster it moves the better.

With extracting heat, yes, I know. That keeps the temp differential larger. When pulling heat out, like when in a radiator, you can most certainly move it too fast. The longer is sits in the radiator, the farther the temp will fall. You're applying simple fluid dynamics incorrectly.