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HVAC Woes

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
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rtfact32
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HVAC Woes

Post by rtfact32 » Thu Aug 01, 2019 4:19 pm

Hello everyone! I've lurked in the posts for some time now and have repaired many things on my V70 from the wonderful information here. This is my first time posting, and I apologize if this has been answered someplace else. I haven't seen this exact same problem, however...

I have a '01 V70 T5 M65 that I absolutely love. I purchased it used 2 years ago with ~217k and it currently has ~265k. I've done quite a bit of work (timing belt, struts, ETM, etc) and I recently had the radiator and heater core replaced. I would have done it myself but I ran out of time.

#1 Now my AC isn't working - and it had been before. I've already done the zip-tie fix to the AC clutch and it was fully charged by the garage that did my repairs, but after initially working it slowly starts to fade. I'm thinking this is a leak somewhere in the system, possibly something wasn't tightened down properly after the radiator/heater core repairs. Thoughts?

#2 The HVAC has never worked quite right (failed blend door actuators) which I can deal with, as long as I can make it hot or cold I'm fine. But after the heater core repair, the airflow seems to be focused on the passenger side - 75% of the airflow comes out the passenger side, 25% the driver's side. Thoughts?

and last but not least:

#3 There seems to be a warm air-flow that is coming from under the dash on the driver's side. I've noticed this since I've had the car, but it is either a) fine in the colder months, or b) overpowered by the AC if it's hot. Now that my AC isn't working it's quite unbearable. Thoughts?

If these questions have been answered elsewhere, please direct me there, otherwise, I'd really love to hear what the group thinks and where I should start looking.

Thanks in advance!


2001 Volvo V70 T5 M65
1973 Volvo 164 4-speed

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rtfact32
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Re: HVAC Woes

Post by rtfact32 » Thu Aug 01, 2019 4:28 pm

Okay, it looks like I didn't look hard enough - the hot air on the driver's side footwell could be this:

viewtopic.php?f=9&t=64147&p=335460&hilit=HVAC#p335460

I'll investigate further.


2001 Volvo V70 T5 M65
1973 Volvo 164 4-speed

MDK
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Re: HVAC Woes

Post by MDK » Thu Aug 01, 2019 4:59 pm

It kinda sounds like a blend door issue. Anti freeze constantly runs through the heater core and maybe it's not put back together quite right. Or it might be the HEAD which is the HVAC control panel. Is the A/C is holding a charge? You can check that will gauges if you have them. Just have to go through your check list..MDK



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rtfact32
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Re: HVAC Woes

Post by rtfact32 » Thu Aug 01, 2019 5:04 pm

It's not holding a charge for sure, I've checked with gauges and did a refill just to be sure.


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E Showell
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Re: HVAC Woes

Post by E Showell » Thu Aug 01, 2019 6:55 pm

An often overlooked source of problems with A/C systems is a bad Schrader valve on the fill tube. Cheap to replace part wise, but you need a valve core removal tool.


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Re: HVAC Woes

Post by MDK » Thu Aug 01, 2019 7:53 pm

As far as leak detection... I know that they have the dye that they put into system with the special glasses. The easy way is to put some Dawn and water in a spray bottle and look for bubbles. It's not that easy to do the evaporator though. O rings on the compressor leaking... Who knows?Just have to pressurize the system..



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Re: HVAC Woes

Post by Roger_850T » Thu Aug 01, 2019 9:02 pm

I would just take the issues on one at a time. Find the leak, and fix it. Sometimes soap and water works. I have a "halogen detector" which has a little sniffer wand, and makes noise when it picks up a halogen (refrigerant), which works reasonably well. It's good for checking hose connections vs. a bad evaporator. (Because I *always* want to find the problem first, *then* fix it, as opposed to shotgunning parts at it and hoping something works.) Once you find and fix the leak, then you can move on to figuring out the door issue. But one thing at a time, or you'll drive yourself batty!

Roger


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Re: HVAC Woes

Post by chrism » Thu Aug 01, 2019 11:07 pm

There are plastic blend door actuators on both the LH and RH sides of the HVAC unit. The actuators on the drivers side tend to interfere with the removal and replacement of the heater core especially if they weren't “parked” in the correct position before beginning the disassembly. This can result in a broken actuator arm and disfunctional blend doors (too much hot air mix). Of course the hot air intrusion isn’t obvious until the engine warms up a bit so you may have decent cooling for the first couple minutes. Thank goodness the dealer sells these actuators, or they may be called “linkages”????

Good luck with the troubleshooting!



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rtfact32
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Re: HVAC Woes

Post by rtfact32 » Fri Aug 02, 2019 8:57 am

Thanks for the reply - but would this cause low/restricted air-flow as well?


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Re: HVAC Woes

Post by chrism » Fri Aug 02, 2019 12:21 pm

rtfact32 wrote:
Fri Aug 02, 2019 8:57 am
Thanks for the reply - but would this cause low/restricted air-flow as well?
As I recall those linkages drive a couple different flapper doors on each side of the unit. I believe it could be affecting the overall flow especially if the problem is only on one side of the car.

Is the airflow ALWAYS slow on that side or only after you run the AC for a while?



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