Heater bypass hose

SCOTTDOWNUNDER

MEMBER
1998 NISSAN PATHFINDER
3.3L
6 CYL
4WD
AUTOMATIC
100,000 MILES

I am looking for an explanation of the heater bypass hose. Mechanic says he has to pull the engine apart to repair it. Is there a schematic or assembly diagram of it? Does it need to be welded or is there an alternative?

Tuesday, October 8th, 2019 AT 12:38 AM

5 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Hi,

Just want to make sure I understand that you are talking about the heater core bypass hose? If not, please let me know which other hose you are referring to. Thanks

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Thursday, October 10th, 2019 AT 4:29 PM

SCOTTDOWNUNDER

MEMBER
3 POSTS

Not entirely sure. Mechanic said heater bypass but after searching online it looks like that would be the heater core bypass He said it could need welding which makes me think its the core bypass as that seems to be the metal pipe at the back of the engine nearest the firewall. He said if it was the case its tricky to get to and would cost more. I assume because you have to either drop the motor out or strip it down? The other hoses all appear to be rubber and fairly accessible. Does any of that help?

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Thursday, October 10th, 2019 AT 7:39 PM

KASEKENNY

MECHANIC
18,907 POSTS

It does but if this were the case that it is a heater core or any other bypass hose, why not just replace it with a rubber replacement line? The only reason it would be metal is if it is in a place that gets hot and it could melt. However, they normally don't route these lines close to heat sources because they want to keep the coolant cool.

It may be necessary for him to show you what needs to be done because you should not have to remove the engine to do any of this. You may have to take a couple things out of the way to get the heater core bypass but it should be too much.

It just seems like something is getting lost between what he is saying and what you are thinking is the issue. That is part of his responsibility to make sure you understand.

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Friday, October 11th, 2019 AT 8:06 PM

SCOTTDOWNUNDER

MEMBER
3 POSTS

Thanks for your help. I'm out of town and all that information was conveyed via the person who borrowed the car when the problem happened. I'll get the mechanic to send me some pictures. Good advice. Thanks again.

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Friday, October 11th, 2019 AT 8:39 PM

KASEKENNY

MECHANIC
18,907 POSTS

Understood. Makes sense you have someone in between you and the mechanic. Good old game of telephone going on here.

Please feel free to send those pictures over here if you want me to look at them as well. Thanks for the update.