Home Forums Gear Hunting Trucks and Four-Wheel Drives Need Suggestion for Tranny Oil Cooler

The only instance it does work is if it were very cold and you let the truck idle until it reached operating temperature, assuming your transmission pumped fluid in park, which many don't

Only ones that don't pump fluid in park are the dodges and some jeeps.

Thanks. Most of my experience has been with jeeps. I knew they didn't and knew Chevy transmissions transmissions did.... Wasn't sure where the rest fell

You are welcome, always a scary thing to check tranny fluid when you have to put it in neutral.

It's usually recommended not to bypass the radiator cooler. If you do, your transmission will not have any cooling when you're backing up because no air is flowing though the cooler in that situation.

You are joking, right?


Most auxiliary trans coolers are mounted in front of the radiator where the cooling fan provides air flow through it��whether you are going forward or backing up.

I proved my point with a link to an outside source. Can to do the same? Please provide your engineering analysis of fan airflow at typical ambient temperatures found in an automobile in the lower 48 of say -35 to 100 degrees Fahrenheit and if said airflow will provide sufficient transmission cooling using an external cooler. Charts and graphs would be helpful. Also, a detailed explanation of how the silicone fluid used in a fan clutch works to disengage the fan to reduce parasitic engine drain would enlighten everyone with your expertise.

And while we're on the topic, let's not forget the move away from fan clutches to electric fans. How much air are they moving on a cold engine at -20 degrees as you're rocking the vehicle back and forth, furiously spinning the tires, trying to break free from last nights snowfall?

Finally if there is sufficient and constant airflow at all times as you claim, why do the makers of external transmission coolers continue to recommend not bypassing the internal cooler located in the radiator tank?

Or you can just keep running your mouth.

The only thing you "proved" is how little you know about the subject being discussed�.you cut and pasted an irrelevant Wiki page that "proves" nothing but your ignorance

It doesn't take an "engineering analysis" to realize that your "backing up" statement is ridiculous and, trying to "prove" that statement by cutting and pasting a Wiki page about clutch fans is even dumber.

Why don't you post an "engineering analysis" demonstrating how "your transmission will not have any cooling when you're backing up because no air is flowing though the cooler in that situation"?

Electric fans?? Well we weren't discussing electric fans, but I'll answer your question. A single speed electric fan, when it is running, moves the same amount of air "on a cold engine at -20 degrees as you're rocking the vehicle back and forth, furiously spinning the tires, trying to break free from last nights snowfall", as it does with the vehicle idling at 100 degrees.

The reason most manufacturers of auxiliary trans coolers don't recommend bypassing the factory cooler is because air to air heat exchangers must be larger per BTU of cooling capacity than liquid cooled heat exchangers. If you ask a cooler manufacturer, they will give you a recommendation for a stand alone air to air cooler to replace your in radiator cooler��whether it will fit your vehicle is another matter.

Do a search for "pink milkshake" and "Toyota 4 runner" and you will find a lot of people that have bypassed the in radiator cooler in their 4 runners and are running stand alone air to air trans coolers.

Best advice I can give at this point is stop digging, the hole you are in is deep enough.

My quote was used to support my position. You are either unwilling or unable to support your position with links to outside sources as I have already requested.

You know, it's fine to have a different opinion. What I can't condone is trying to discredit another member's opinion, which is what you've tried to do here. Simply stating that in your experience you would take another approach would have been sufficient and made the Campfire a better place for everyone. Get it? Grow up, man up and if you can't then shut up.

Your quote didn't support your position because your "position" was foolish and the quote was irrelevant�.instead of trying to learn something, you became defensive and started asking for "engineering analysis"��you don't need an "engineering analysis" , a Wikipedia quote or an "outside source" to know that a mechanically driven fan moves air across the radiator, even when equipped with a thermal clutch��just start the engine and observe what happens!!

Your "backing up" post wasn't stated as an opinion, it was stated as fact��it's not a fact, it's not even partially true. I don't have a "different opinion", I have actual experience, I've worked on clutch fans, heat exchangers and cooling systems��the truth is, you posted something that was so obviously false it was comical.

Like I said, I've been doing mechanic work for 40+ years��..I noticed you avoided the question concerning your experience.

Maybe you need to take you own advice about shutting up, especially when you don't know what you are talking about.

Here are Hayden's instructions for installing their transmission oil cooler -



Hayden Cooler Instructions

You can all go with what Hayden and their engineers have to say on installing a cooler, or chose to follow our resident expert who seems unable to back up any of his claims.

Did you notice in figure B that Hayden's own instructions show the installation of their cooler with the factory cooler bypassed??

Guess you are only suppose to install it that way if you have no fan clutch and no reverse gear??

This just keeps getting better!!

And did you READ that Option B install was only to be used if your internal radiator cooler was damaged?

Yes, better indeed!