Couple Odd Heating Issues

Post by **abscate** » 03 Jan 2018, 16:43

You can feel the Al pipes above the gas pedal and see if they are both hot. If they are, then the core is ok.

My guess is the temperature door has gone faulty,which is not routing air through the heater core

brunocerous · Post by **brunocerous** » 03 Jan 2018, 20:19

Funny, I have been having the same issue with cool air coming out of where melt-your-face-off heat used to exist and figured it was due to bad heater cores in the '98 V70, which I've owned for four years, and the '00 V70, which also stinks of coolant.

I have a Swedish Parts and a Nissens ready to swap in as soon as the weather cooperates, but I'll check the temperature doors. Thanks, all!

Post by **abscate** » 04 Jan 2018, 05:03

You can wash that Swedish parts one in the dishwasher while you wait....

ir637113 · Post by **ir637113** » 04 Jan 2018, 08:55

My guess is also the control valve. I'm waiting for payday tomorrow so I can grab some fuel to heat my garage and mess around with it, but any ideas where that might be? Google is not my friend right now - keeps showing me where it is on other Volvos, but it doesn't seem anyone has taken any pictures of this on an 850

Post by **abscate** » 04 Jan 2018, 13:10

You don't have a heater coolant flow control valve, but you do you have damper door inside the climate unit under the dash that mixes outside/AC air with heated air from the heater core.

If your core isnt plugged (easily confirmed) the damper or blend air door is all that is left to fault.

ir637113 · Post by **ir637113** » 06 Jan 2018, 12:03

abscate wrote: ↑04 Jan 2018, 13:10 You don't have a heater coolant flow control valve, but you do you have damper door inside the climate unit under the dash that mixes outside/AC air with heated air from the heater core.

If your core isnt plugged (easily confirmed) the damper or blend air door is all that is left to fault.

That's more than likely what it is I guess. Just so I'm positive - if I get it up to temperature, and both pipes coming right out of the back of the heater core are hot to the touch, the heater core is fine?

The only reason I ask is that I did that and the hoses burned the crap out of me (everyone kept saying "warm," how was I supposed to know?

), but I keep getting paranoid about my replacement job - we thought for awhile that I hadn't done a good job connecting the hoses in because the floorboard kept getting wet with antifreeze.

ir637113 · Post by **ir637113** » 06 Jan 2018, 12:50

abscate wrote: ↑04 Jan 2018, 13:10 You don't have a heater coolant flow control valve, but you do you have damper door inside the climate unit under the dash that mixes outside/AC air with heated air from the heater core.

If your core isnt plugged (easily confirmed) the damper or blend air door is all that is left to fault.

I'm not sure I quite understand. Watching through Robert's videos, it sounds like the blend air doors do more with the direction And force of the air rather than with the temperature. Did I miss something?

Post by **Rattnalle** » 06 Jan 2018, 13:09

ir637113 wrote: ↑06 Jan 2018, 12:50
abscate wrote: ↑04 Jan 2018, 13:10 You don't have a heater coolant flow control valve, but you do you have damper door inside the climate unit under the dash that mixes outside/AC air with heated air from the heater core.

If your core isnt plugged (easily confirmed) the damper or blend air door is all that is left to fault.
I'm not sure I quite understand. Watching through Robert's videos, it sounds like the blend air doors do more with the direction And force of the air rather than with the temperature. Did I miss something?

They do both temperature mix and direction. The hot water always flows freely through the heater core.

ir637113 · Post by **ir637113** » 08 Jan 2018, 10:36

Rattnalle wrote: ↑06 Jan 2018, 13:09
ir637113 wrote: ↑06 Jan 2018, 12:50
abscate wrote: ↑04 Jan 2018, 13:10 You don't have a heater coolant flow control valve, but you do you have damper door inside the climate unit under the dash that mixes outside/AC air with heated air from the heater core.

If your core isnt plugged (easily confirmed) the damper or blend air door is all that is left to fault.
I'm not sure I quite understand. Watching through Robert's videos, it sounds like the blend air doors do more with the direction And force of the air rather than with the temperature. Did I miss something?
They do both temperature mix and direction. The hot water always flows freely through the heater core.

Thanks for the catch. I had actually emailed Robert a few days ago and he told me to pull it apart and check to see if the blend doors are working.

God I hope that's it. I'm tired of dicking with this thing.

Now I just need to figure out how to get to those doors

all the videos I've seen already have it taken apart.

ir637113 · Post by **ir637113** » 10 Jan 2018, 15:57

This f*$#ing thing.... Now it won't start.... Lol. I didn't even get to try the damper door fix yet. Was trying to go to work Monday morning and nothing. Charged the battery, nothing.

Cranking, but won't actually start. Like.... Wtf...

Couple Odd Heating Issues

Re: Couple Odd Heating Issues