Complete Coolant Hose Replacement (Toyota 3.4L 5VZ-FE V6)

In this video, we show you how to replace the majority of the coolant hoses on a Toyota 3.4L V6 5VZ-FE Engine. This engine was used in 3rd Gen 4runners, 1st Gen Tacomas, T100s and 1st Gen Tundras. The only hoses we don’t replace is the upper and lower radiator hoses which we cover in other videos listed below.

**RELATED VIDEOS**
Stock Radiator Replacement

Champion Aluminum Radiator Install

Koyo Aluminum Radiator Install

Coolant Flush

**TORQUE VALUES**
Alternator Pivot Bolt - 38 ft-lbs
Alternator Adjuster Lock Nut - Go by feel for this one. At most 14 ft-lbs
Oil Cooler Bolt - 43 ft-lbs
Wheel Lug Nuts - 85 ft-lbs

**PARTS**
#87245-35670 (Heater Hose)

#96134-42100 (Heater Hose Clamp) (Need 4)

#90467-22004 (Heater Hose Clamp) (Need 4)

#87245-35690 (Heater Hose)

#87245-35700 (Heater Hose)

#90467-23009 (Heater Hose Clamp) (Need 2)

#87245-35680 (Heater Hose)

#87245-35710 (Heater Hose)

#87245-35770 (Rear Heater Hose in Engine Compartment)

#99556-10300 (Rear Heater Hose in Engine Compartment)

#90467-14029 (Rear Heater Hose Clamps) (Need 8)

#16261-62060 (Bypass Hose to Throttle Body)

#99556-10300 (Bypass Hose to Throttle Body)

#96135-51300 (Bypass Hose Clamps) (Need 4)

#87245-35451 (Rear Heater Hose Under Truck)

#87245-35461 (Rear Heater Hose Under Truck)

#90301-67004 (Oil Cooler Gasket)

#90210-22001 (Oil Cooler Bolt Washer)

#15777-62020 (Shorter Oil Cooler Hose)

#15778-62030 (Longer Oil Cooler Hose)

*Toyota Red Long Life Coolant Concentrate (Needs to be mixed with Distilled Water)

*Distilled Water - Pick this up at a grocery store

*The Following are Associated Cooling System Parts Not Replaced in This Video*

*1999 - 2002 Heater Control Valve #87240-35070

*1996-1998 Heater Control Valve #87240-35050

*Thermostat #90916-03075

*Thermostat O-Ring Gasket #16325-62010

*Radiator #16410-YZZAJ (This is just like the OEM one that came on the vehicle when it was new)

*Upper Radiator Hose #16571-62070

*Lower Radiator Hose#16572-62090

*Radiator Cap #16401-20353

**HELPFUL TOOLS**
See Pinned Comment (1st Comment You See) For the Complete List of Tools Used in This Video.

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[TimmyTheToolman]

**HELPFUL TOOLS**
*If you're looking for other tools not used in this video, check out Timmy's Master Tool List.*

















*Milwaukee M12 3/8” Cordless Extended Reach Ratchet*




























**As Ebay Partner Network members, we earn commissions from qualifying purchases.
**As Amazon Associates, we earn from qualifying purchases.

[hypeo]

This is quality work. Appreciate everything you do for us 3.4L owners!! My 2000 4Runner needs this full refresh come spring time. Thank you Tim!!

[bustedkeel]

Great video!! I'm in the middle of this right now on the 3.4L and this was helpful. I also opened up the intake manifold which exposes more coolant passages and gaskets and the large coolant bypass tube that can sometimes leak into the V of the engine. I would love to see a similar video on the dozens of air hoses, and explaining what they do! It's hard to put things back together after digging into the intake and feel confident when it doesn't make sense to me.

[lmperialCoffee]

This is crazy! I was just doing a TON of research on hose replacement not two days ago! What amazing timing!

[aoprngvua]

Yes! Perfect timing! I've got a little pink drip coming from somewhere under the intake manifold on my 01 Tacoma and I was just about to put my own hose list together, but you've conveniently done it for me! I'll definitely give this one a watch when I get off work. Cheers Timmy! Remind me to buy you a beer 🍻

[richardsauer]

Your videos are top notch! 80 series and a 3rd gen? Good for Aaron!

[Spiders.Adventuress]

Just got my timing belt and water pump done now all my hoses are bursting just ordered them thanks Timmy me and my 3rd gen thank you

[jackwalsh]

Tim, another very educational video. Cheers, Mate.

[marvinshorty]

The cotter pin type hose clamp reminded me of opening a can of Spam or corned beef in the olden days. Lol. Keep the great videos coming.

[TheDesertRat]

Interesting timing of this video. I just ordered all the coolant hoses to replace the originals in my 08 4runner. I figured at 320k, it might be time. They don't feel overly soft, buti don't want one to burst unexpectedly. I thought it was cheap insurance going forward. I also have a new water pump and thermostat from when I was chasing a coolant leak. Turns out it was a bad radiator. So it'll be a good time to put those other parts on also.

[MichaelMansour-gm]

Tim, great video as always. I've replaced the oil cooler o-ring on all 3 of my 4runners. If u have a heat gun, that helps get that hard brittle o-ring out a little easier. Thanks MikeM

[benaldredge]

Great informative video.
Appreciate you all taking the time to put together.

[stco]

Great work Timmy and team. While this is especially linked to the particular vehicle, much of this is generic to many Toyotas of relatively similar years. The tools (great to include these) and approaches are the same as many, many vehicles have the same types of hoses, fittings and clamps and you gave loads of great advice. Agree that it’s best to refresh the steel couplers and this can be done with some abrasives and increasingly complex amounts of paint or plating if time etc allows. Some of these are also not that expensive to replace if in poor condition. Very detailed video description and didn’t know so much is available on eBay and the like. Good work with the oil cooler and I wonder if you could have attached the hoses to this before it went back on? This way two of the hoses could have been fitted on the bench. I’ve occasionally used copper grease to lube hoses on fitting. I think it’s probably fine where the coolant is designed for copper and brass rads. More recently I’ve used LA-CO LAC-42018 pipe thread compound. It’s “For threaded pipes carrying hot or cold water, gases, steam, air, petrol, oils and refrigerants. Solvent and water-free, contains teflon and PTFE. Brushes on oily, wet or cold threads. Disassembles easily. Will not dry out or harden.” Seems fine, is not expensive and a small tub will last a lifetime. I had a look at your Amazon store thing and noticed your vids there, too. Nice!

[eljefeslash]

Thank you for this, Timmy! I just bought most of the hoses recently to go along with replacing the heater control valve (for preventive purposes) and hadn't done the job yet. As always, you point out what each hose goes to/from (helping us to learn more about this rig), and you note the part #'s along the way (much appreciated!). A couple of questions: (1) if I'm just mainly replacing those heater hoses around the firewall and under the throttle body (not the ones under the rig and not the oil cooler hoses - yet), would I really need to drain the radiator? I just replaced my radiator not too long ago, so I hate to drain and replace that relatively fresh coolant again if I don't really need to. (2) I bought the colored silicone hoses. Do you think that P-80 lube would work ok with that material? Thank you! Hope you're enjoying retirement and getting to wrench and do more fun stuff!

[MrCalifornia]

Good job Tim! How are you enjoying your retirement?

[hsing]

@TimmyTheToolman Timmy do you have a video how to replace the 3.4L Coolant Bypass Pipe? I'm trying to find out if I will have to take off everything on top of the valley. Thanks you are the man!

[scotto]

I have an '02 Tacoma with the 5VZFE engine also. I've stared at that oil cooler many times while under the truck and came to the conclusion that I hope I never have to deal with it!! After watching this, I'm wondering if you think there might be any advantage to removing the oil cooler from the engine before disconnecting the hoses? Would that make it possible to get the cooler in a little better position/out of your way to remove the hoses? Just an idea. Since you had the guts to actually do this, I'm sure you would know if that would work or not. I've also heard that there is a kit you can buy if you want to delete the cooler all together. I've read that if you aren't driving hard or towing with the truck, you probably don't need it. Might be a consideration if the cooler itself is defective as I believe a replacement OEM cooler is $900.00. As usual, great video!!

[tlallihouse]

How do you feel/think about mishimoto coolant hoses from Amazon? Wondering if you or anyone you know has any experience with their brand....
Love the channel!

[FreeKanal]

I use acid free vaseline to lubricate rubber hoses. Also works great.

[isaacsumera]

Hey Timmy! Do you recommend using the toyota oem hoses or the mishimoto silicone hose kit? Also, do you know the part numbers to the evaporator canister hoses? Mine are falling apart. Thank you!