How To: Swap a 20v by System

3. Cooling

The 20v does require hoses to be run differently. It is very straight forward, and one of the easiest parts of the swap. Rather than draw up a detailed explanation, here are some detailed pictures:

The rule of thumb that I use is link the driver’s side hard line that runs under the center of the car to the driver’s side water outlet on the 20v motor. Same for the passenger side. The passenger side hardline (the one with the oil cooler) goes to the water inlet on the back of the head next to the exhaust manifold. I usually try to incorporate my filler neck into this side of the cooling system. The needed hose stock can be purchased at Napa along with any flexible hoses you might want to use.

The heater hoses are also very straight forward. The 16v hoses can be used, but it is better just to buy the correct diameter tubing, and simply cut new hoses to length.

This documentation in no way replaces the Toyota MR2 Repair Manuals. The purpose of this content is only to provide supplementary information to fellow MR2 enthusiasts. Midship Runabout and its contributing authors will not be held responsible for any injury or damages that may occur as the result of practicing any of the methods or procedures described within this website. Article and photo submissions are property of the contributing author.


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9 Responses

  1. Jason McDaniel says:

    Can I get contact info to buy a harness?

  2. Jimmy Lam says:

    Got a 1993 Corolla dx station wagen stick shift, would like to swap from 7afe (stock engine) to 4age 20v BT, need some tech advise and would buy a plug and play harness from you, pls contact me via the above email, much appreciate your post and have a great day.

  3. Troy says:

    Hey, I’m planning to do this swap over the summer, how do I get one of these ‘plug and play’ harnesses?

  4. Daniel says:

    I am also interested in a harness, could you please get in contact with me if its still an option. I have a mk1 mr2 with the swap already done, but it was done poorly and the harness is hacked….

  5. yerv says:

    hello there,
    I would also like to purchase one of these harnesses. Please get back to me as this wiring stuff was the only thing holding me back fromfrom finally tackling the swap

  6. Addison says:

    Hi,

    Thank you so much for your post it is very helpful! Can I buy a plug and play harness from you? I am planning on doing a silvertop swap with my aw11 soon. Thank you!

  7. daniel says:

    yet another request for a harness……is it still something you can do? can you source the original harnesses as well? thank you for your time.

  8. Michael says:

    good day,. i have a ee100 with 2E engine swapped with 4age BT,. what do i need to have my exhause pipe fixed, pls comment on sensors needed to be added and/or installed pipe sizes, for proper functionality of the engine

  9. mr220v says:

    Looks like this old writeup of mine travels far. Originally did it on mr2.com 6 years ago maybe.

    PNP harnesses can be ordered at http://www.wiregapinc.com

    I swap the 20v among other things.