2002 Mazda Millenia coolant bypass hose

I knew they were taking advantage of the situation, but I had no choice but to pay for the repairs. So now they want $400.00 more for this hose that I think should be an easy fix. I was checking with Autoparts warehouse and they have a coolant bypass hose for $21.38 but its indicating 'upper'. So is the hose on top of the engine, or below. I am just trying to make sure I am getting the right hose, I can't afford for this not to be right, then the car break down on the side of the road with a blown engine.

That's why I am reaching out to anyone other than the dealership, to get guidance to repair it my self. No pictures necessary, just written instructions, I can do the work, just want to make sure I am getting the right part prior to installation. Is it a flexible hose? Pipe? Upper? Lower? These are questions I am facing with each call to a parts store.

Hi Mike :0)

I cannot thank you enough for your guidance and advise. I called another local Mazada dealership, found out the coolant bypass hose was only $10.31, $11.03 with tax. They had to order it since it is not in stock and should be here Thursday around 11am.

I am so happy, confused, and irritated all at the same time. Happy because $11.03 is a far cry from $400.00. Confused because why would they charge me $400.00 on an $11.03 part, is there a lot of labor involved? Is that why the price is so hiked up? Should I give in and pay the higher price since I have to remove lots to get to this hose? Then I am frustrated because of such a price difference. Are they taking advantage on me or my situation?

I am all about DIY and do have some general automotive knowledge. Fingernails and grease do not bother me. I just cannot afford to drive this car around when this hose is so important and in dire need of replacement before I end up locking the engine up and stranded on the side of the road.

No worries about videos or pictures (although it would be great to have a visual demonstration) but if I just get written direction, I should be able to tackle this hose replacement. According to the mechanic that diagnosed the problem, the hose is split causing the antifreeze to leak out opposed to supplying the engine with the reserve.

The diagnostic specifically read, "checked cooling system & found the coolant bypass hose under the intake is leaking & will need to be replaced. This is causing the misfire codes. Codes P0300 & P0302 are stored for misfire & codes P0421 & P0431 are stored for warm-up CAT efficiency below thresh hold."

Are we still on the right track as far as the directions you have given me already?

Hi Mike :0)
I can fully understand, when OT is offered, go for it. It's a blessing just to have a job these days and overtime is rare and sweet all at the same time ;0) I have opened the hood and removed the air-filter containment box. I have looked around and see several hoses leading to the block, then the firewall, etc.

I too am not that concerned with the codes at this time. I'm sure once I replace this hose, they will reset themselves (hopefully). I have been trying to see if there is any step-by-step or video on-line I could access to get a visual on just where this thing is. No luck.

If you have access to a Mazada, could you photo it for me? I could definitely use a visual since there are so many hoses. I would even be willing to give you my phone number if you have a few minutes and walk me through it. I wouldn't feel comfortable posting it here (I don't need a lot of phone calls) just for your eyes only. You have my email address and could call anytime. Until then, any advise would be greatly appreciated since I need to utilize this car tomorrow for work.

Plus there is a hurricane in the Gulf, so we will be getting rain from the outer bands, so I will be fighting 60% chance of rain today and tomorrow. So any guidance or assistance would be great :0)

I will try to go out and look in-between the rain. I have seen several hoses that you are referring too. I have no problem getting my hands dirty, I just don't want to start removing hoses that don't need to be removed and waist time doing it since the rain is pouring as we speak. I have tried to research too to see if I could get a clear visual, but no success.

Now the fear of using my car for necessary commutes, then damaging the engine beyond repair all due to this 6inch small coolant bypass hose. I know I can't do the $400.00 without becoming homeless. It's very frustrating to be so close, yet too far ;0(

Got it! So far the last three days have been amazing and uneventful, yea! No more adding water at every stop. Thanks so much for the step by steps along the way. It's a shame there was no visuals, but the pressure tester really, really helped identify the culprit. Thank you so much ;0)