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Put in a used heater core...

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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TheOtherside
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TheOtherside

Put in a used heater core...

Post by TheOtherside » Sun May 17, 2020 11:16 am

No more foggy windshield or steam pouring out the vents

But it doesn't get very warm...

Any idea what the problem might be?
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Re: Put in a used heater core...

Post by crlande » Sun May 17, 2020 12:21 pm

clogged core, bad thermostat, blend door issue?

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Cookeh

Re: Put in a used heater core...

Post by Cookeh » Sun May 17, 2020 12:44 pm

The above, plus potential trapped air in core.

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Re: Put in a used heater core...

Post by abscate » Sun May 17, 2020 2:04 pm

New foam needed around heater core, or else the air doesn't go through it.

If your cooling system is working ok, it is doubtful the core is clogged since they are full flow.
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TheOtherside

Re: Put in a used heater core...

Post by TheOtherside » Sun May 17, 2020 4:07 pm

It gets warm, takes a bit, but definitely gets warm.

Gets colder at idle after 5 minutes.
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ecbsykes

Re: Put in a used heater core...

Post by ecbsykes » Sun May 17, 2020 4:51 pm

Did it get super hot before (foggy window and all?)

If so, my bet is on trapped air or like abscate said the foam insulation around it. Let the system warm up to full temp with the coolant reservoir cap off, rev a little to try and get things moving around a bit to purge system of air. Carefully see if you can reach and (emphasis on carefully) feel any heat of the heater hoses going into the cabin.
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TheOtherside
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Re: Put in a used heater core...

Post by smacknab » Sun May 17, 2020 8:29 pm

"I also like to live dangerously"

Seems like you have some good suggestions here. If you haven't done this job before just make sure to check waaaay under your carpet for coolant. The top of the floorboard soundproofing foam is rubber so it's possible to miss the coolant and a couple of us have gotten burned by coolant living under there.
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Re: Put in a used heater core...

Post by smacknab » Sun May 17, 2020 8:32 pm

"I also like to live dangerously"

Seems like you have some good suggestions here. If you haven't done this job before just make sure to check waaaay under your carpet for coolant. The top of the floorboard soundproofing foam is rubber so it's possible to miss the coolant and a couple of us have gotten burned by coolant living under there.
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Re: Put in a used heater core... 9144221

Post by abscate » Mon May 18, 2020 4:45 am

The Swedish car parts core is $38 through amazon via the MVS amazon link, not much more than junkyard one with lifetime warranty.

Clean thoroughly to remove oil smell before installing
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TheOtherside

Re: Put in a used heater core...

Post by TheOtherside » Mon May 18, 2020 7:44 am

It got really warm before with foggy windows.

I had a friend do it and I wasn't there, so I don't know what the foam around it even looks like to say yes or no :(
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