Heat Help

olds60 · Post by **olds60** » 20 Nov 2023, 15:19

So I'm a new owner of a 2007 s60 2.5t. It was very well dealer maintained by the previous 1 owner, however I have a heat issue.
1. I had almost no heat in the passenger compartment with temp selector all the way up, max fan, auto or manual modes.
2. I did notice a temperature difference when going from cold to hot which lead me to believe the flap actuators were working properly.
3. Engine heats up as it should and temp gauge on dash once warm goes to the 12 o'clock position right in the center as it should and it doesn't overheat which leads me to believe thermostat is working properly.
4. checked the lines in the engine bay going into and out of the heater core. one hot, one not, which lead me to believe heater core was blocked. disconnected lines and flushed with water, normal direction and buck flushed appear to be flowing fine. connected back up, same problem.
5. I thought it may be some other clog in the system therefore I drained all coolant and performed a coolant flush with blue devil and water. I decided to run the car for a drive with the blue devil and the heat worked perfectly.
6. drained, flushed system with water, drained and then refilled with new coolant 50/50 mix. now it does heat but not hot enough for example on a cold day like today on a 1 hour commute at highway speed had to drive with heat and fan on max.
7. what confuses me is this after completing my commute and in the city at idle heat is lukewarm however when revving the engine or while accelerating, heat is hot! almost as if there is air in the system but from what I have read there is no bleeder screw. I have run the system with cap off and am pretty sure there is no air in the system. Lastly why was it working flawlessly with the water/coolant flush? Help Please!

Post by **jonesg** » 20 Nov 2023, 17:43

some things to check ,

turn the defrost off,
make sure the elec cooling fan on the radiator is not running
make sure the AC is not on.
set air to recirculate rather than fresh intake air.

what is the weather temp wherever you are located.?
do you have vida or a code reader.?

Post by **chrism** » 20 Nov 2023, 18:45

When you fill the coolant system, top it fully up via the radiator cap. Then fill the expansion reservoir about 3/4 full. Leave the cap off of the reservoir for the moment. Then grasp the upper radiator hose with both hands beside each other and squeeze as much air out of it as you possibly can. It should bubble up through the coolant in the reservoir. When you release your hands from the hose the level in the reservoir will drop significantly. Fill the reservoir to about the 1/3 level and repeat the hose squeezing routine one more. Make sure you leave the reservoir about 1/3 full and screw the cap back on. Monitor your coolant level and run the car through two or three warm up/cool down cycles, all the while making sure the reservoir never goes empty.

olds60 · Post by **olds60** » 28 Nov 2023, 08:31

Update:
It seems there may have been some air in the system. shortly after posting, 2 drives later, all is working normally. I did perform the hose squeeze and checked the other suggestions above prior. Hopefully everything continues to work as it should. Thank you for your assistance I appreciate it.

Post by **vtl** » 28 Nov 2023, 08:40

chrism wrote: ↑20 Nov 2023, 18:45 When you fill the coolant system, top it fully up via the radiator cap.

What radiator cap?

Post by **chrism** » 28 Nov 2023, 11:01

vtl wrote: ↑28 Nov 2023, 08:40
chrism wrote: ↑20 Nov 2023, 18:45 When you fill the coolant system, top it fully up via the radiator cap.
What radiator cap?

Good catch!! Got my cars mixed up.

yanga001 · Post by **yanga001** » 28 Nov 2023, 11:15

olds60 wrote: ↑28 Nov 2023, 08:31 Update:
It seems there may have been some air in the system. shortly after posting, 2 drives later, all is working normally. I did perform the hose squeeze and checked the other suggestions above prior. Hopefully everything continues to work as it should. Thank you for your assistance I appreciate it.

When i filled up my old V70 what i would normally do is remove the top radiator hose and fill it from there with the correct coolant until it nearly comes back out. This seems to slowly fill the rad which is where a lot of air gets trapped. Then i filled from the reservoir which fills the block up directly more or less. Didnt normally notice too many air bubles when i did it that way.

Post by **vtl** » 28 Nov 2023, 11:26

I usually just fill up the expansion tank to the top, then drive around until see the low coolant warning and top it off immediately. The coolant gets barely warm by the time the level drops, so opening the expansion tank does not pose any risks.

olds60 · Post by **olds60** » 22 Dec 2023, 08:27

I'm back and unfortunately have heat problems. The heat was working fine then recently very little to no heat. i used a scan tool and found the following: 0071 permanent fault Damper motor faulty position. If I switch the output from floor to upper to defrost or even when I switch from fresh to recirculate it seems to work properly and I can hear and feel the air change. Also when I go from cold to hot I feel the temperature change from very cold to warm. I don't know what vida is. Is it a proprietary volvo software and hardware scan tool. I'm working with an autel ts608. the code 0071 seems to be a temp sensor? but the description is for damper? although I could read the code it could not reset possibly due to permanent failure. also I could not find a damper recalibration option?
***Please Help***

Post by **vtl** » 22 Dec 2023, 08:32

VIDA is a proprietary software, like TIS to Toyota. DiCE is a proprietary version of J2534 scanner.

You need to replaced that damper.