Earlier this year, I picked up a new coolant reservoir and cap, along with the upper and lower radiator hose, and both the lines running to the coolant reservoir.

I was talking with rspi, and he mentioned there are some other hoses I should change out at the same time.

Note that I have a 97 855R.

It appears there are 7 hoses in the cooling system I should be replacing.

If your car is turbo, you have the following hoses:
1. Upper radiator - 1335433
2. Lower radiator - 9470409 / 6842428
3. Upper reservoir - 9135267
4. Lower reservoir - 6842894
5. Heater inlet - 9186849
6. Heater outlet - 9186847 / 3528275
7. Turbo supply - 6842190
8. Turbo outlet - 30713305
As a bonus, you should also replace the heater hose locking clips. If they fail, the hose will pop out and cause the loss of coolant, yes in seconds. - 3545662

Are there any others? If there's a turbo return, is there a turbo supply hose?

How difficult are the heater core hoses to replace? Do I need any special clips / seals / o-rings / tools etc? I notice the heater core hoses have a metal end on them that is crimped, will I have to pull the heater core to replace the hoses?

I'd prefer to drain and refill the system once, instead of replacing the 4 I have now, and finding a leak in one of the others down the road. All of mine are original. None are leaking at this time.

 

None are leaking, but you have to replace everything? Ok, I have to ask...

Why?

If there was a trophy for preventative maintenance, you'd win it


The turbo supply line is metal. It runs along the side of the motor, above the turbo heat shield, and connects near the timing belt cover to the hose coming from the bottom of the coolant resevoir. There is a small hose that connects the two, and I suppose you could buy the actual hose that goes there. Any small piece of heater hose works.

The hoses going into the heater core require no special tools. Squeeze the clips an pull. You will probably want to replace the O-rings though. Once you pull the hose, the rings usually don't seal back up. There's a kit available, though I believe your new hoses should come with new seals and clips.

When you pull the heater hoses, count the number of O-rings and little plastic washers that come out. Sometimes one will get stuck in there and the new hose won't clip into place.

 

Thanks for the advice.

Yes, it seems a little... ****. Or meticulous, some people get bothered by that word

The thing is, the hoses are all original. From 1997. By any definition of the word, they've last longer than expected.

I don't want one to fail at an inopportune time - which means pretty much anytime I'm driving the car. I have 3 kids I haul around with me, and I don't want us to get stranded because a hose burst.

Seems I'm doing half the job, if I ignore the other lines.

Maybe I'm just picky.

 

What's wrong with preventative maintenance? Do you wait until the car is misfiring to replace spark plugs? Do you wait until a tire blows out from being worn down to the cords to replace it? Do you wait until the timing belt snaps to replace it?

Replacing wear items before they fail is a good idea for just those reasons john mentioned.

 

I feel as if I'm beating a dead horse but do replace those hoses. I really would rather replace a $6 hose behind the motor than have it blow on me while driving down the freeway. If it blows, you will loose all of your coolant in about 10 seconds, then the car will overheat in about 20 seconds. At that point you have a do or die decision to make, do a head gasket or junk the car...

John, yes there is another hose, that makes 8 total. I order it today from FCP. It is the turbo supply line. Was texting my Orlando mechanic last week and found out that his blew a few months ago and it caused the car to overheat and blow his head gasket.

Volvo Turbo Inlet Cooling Hose-At Turbo - Genuine Volvo 6842190 | FCP Euro


As you know, I caught a leak back on my turbo return line the other day. I was so thankful. I believe every car over 10 years old should have all of their coolant hoses replaced.

Oh, when you replace those heater hoses, do replace the plastic lock clips that go into the firewall coupling. Spoke to a lady JUST TODAY that had one of those plastic parts come loose, blew the hose out, caused her to overheat the motor because she could not pull over fast enough with the highway traffic she was in. Sad thing about the clip kit is that it is only $9 cheaper than the entire part.

Volvo Heater Hose O Ring Kit (850 C70 S70 V70) - Genuine 3545662 | FCP Euro



My daughter took her car in for service last week and she asked the mechanic to replace ALL of her coolant hoses and when she picked up the car he only replaced 4. So it is very common for mechanics to overlook the other coolant filled lines as well. Next time she will have them replace the other 4 plus these clips:
1. Turbo return.
2. Turbo supply.
3. Heater supply.
4. Heater return.

So, if you have a turbo, you have 8 hoses to replace. Mudpie, replace the hoses and join the WINNING team.

 

I added part numbers.

 

it is a right though to be on the precautions as to avoid the unwanted circumstances from happening at any unusual point of time






Tevida Side Effects

 

johnwatr and rspi: good job on compiling the list! But why is this is not in the 850 section?

rspi: maybe you can move it there and make it a sticky?

It took me some searching to find all those part numbers (about to do all the hoses on both cars). Why? Because after 12 yrs or 150K mls, they're due! Why drive with a ticking time bomb; riding shotgun in the tow truck isn't that much fun.

I wish someone would do in-depth explanation/how-to on the heater hoses; they can be a real pain. I couldn't figure out how to get the old o-rings out.

 

 

This thread was copied from the 850 thread and it was stuck there and someone complained about it. I left it stuck for about a month and unstuck it. I'll link this one in the 850 DIY / Hot Topic section under coolant hoses/system.

https://volvoforums.com/forum/volvo-...em-asap-74488/

 

u may want to consider the engine may fail too after u replace all the hose? or the transmission? or suspensions? water pump? timing belt, tensioner, idler, nuts & bolts? or some other electrical issue too? u may want to consider replace all the wiring in the car just like the airplane does. all i m trying to say is that there are many parts in a car. u can't never replace everything. usually in the case like that u can on repair what u see may cause a problem in the near future. or pay close attention to whats known to be a common problem to the vehicle.

 

If you don't like or appreciate the post, do like 15,000 other people do and ignore it. There are lots of first time car owners out there that have NO IDEA that an old coolant hose can ruin their day in less than 1 minute. That's who the thread is for. And for others that know better and would like a quick reference to the info, like parts numbers, etc.

Besides that, how can you compare replacing a coolant hose to a wire harness? Are cars known to blow wire harnesses and burn to the ground on a daily basis? Will a bad strut cause you to loose your car because it went bad? If a bolt falls out of my bumper will my car stop running? Water pumps, timing belts, tensioners are all part of routine maintenance in the owners manual which are time change items, coolant hoses are not.

Thanks for the support and for helping with the suggestions. Please post a list of the bolts I need to replace before my car falls apart.

 

if u r not professional enough or have enough car knowledge, STOP giving out wrong information. I have seem more electric fire that cause the car to total lost. Including 850's. just because u don't know doesn't mean it is wrong, is just shows that u r lack of knowledge. I m a Volvo Master Tech & been in the trading for over 18 yrs. This is what I do for living I deal with cars everyday. If I go tell a 850 customer that is time to replace all the coolant hoses because your car is old, I m sure I'll b call "stealer" too. I m here only to help & give out my professional suggestion. If I m wrong or if anyone could come up with a better solution, I m willing to learn. But not with a non-sense idea.

 

How many of your customers have you suggested to replace all of their wiring on these 850's? Yes the old red blocks in the 80's had bad wiring harnesses that likely should have been recalled but overall 850's do not have car fire issues. Even with the horrible wiring that the red blocks had, not as many of those went up in flames as could have.

I go to the junk yard all the time. About 1 out of 100 cars is there due to fire. Are all of those fires due to wiring issues, no. From oil leaks to fuel leaks, etc. On the other hand, how many of those cars are there due to blown head gaskets, likely due to coolant hose failure, leaking radiators, etc.? My guess would be more than 1 per 100.

From where I am, I'm here to help people learn how to care for their car. If you see something wrong with some information I point out, simply give the correct info to help the readers. What part of the suggestion to replace coolant hoses was wrong? The fact that a blown hose can cause motor to over heat? The fact that they get old and leak or blow? The part numbers?

No I am not a certified mechanic doing this for a living, just an enthusiast. I see mechanics (the common name for a grease monkey) suggest people replace coolant hoses, water pumps, brake lines and other parts that need replacing. If the customer doesn't appreciate an honest recommendation, that is their loss. I don't know at what point one crosses from a mechanic to a Master Tech but I hope it somehow benefits the customer using the facility.

 

there is nothing wrong in sharing whatever the good you have to suggest others .. it is upto the receiver to check for the credibility prior to go with any advice

Tevida Price
Tevida Side Effects

 

Yes but what if it's misleading? I mean the information is wrong an potentially damaging.

 

Every time I do a search for information on how to replace a Volvo part or determine if a Volvo part is failing, this site keeps coming up. I came here numerous times before I joined, to learn how to replace parts and that has saved me thousands of dollars. I've yet to see a wrong answer to a question on this forum. If a wrong answer to maintenance and part replacement exists here, I'd like for someone to point it out and prove it to be wrong because I've yet to see it here.

 

How about this- Are Silicone hoses better for the 850 than standard rubber hoses? I've been considering replacing the lower radiator hoses with the Silicone hoses sold from IPDUSA website.

 

Can you be more specific

Are you saying that advising people to change out their coolant hoses is wrong or potentially damaging ??

If information is wrong or in any way unacceptable to you flag it and a moderator can jump in and correct or eliminate it should they agree. Sometimes it's just a matter of opinions and everyone is entitled to theirs as long as they present it in a proper manner.

 

Kudos on your preventative stuff. Nothing like some moron crying about a breakdown or lost time from work doing a repair. Just means your paying attention to your vehicle.