AC on full blast when car starts up

HafizBahar · Post by **HafizBahar** » 28 Sep 2019, 04:37

I've been getting this problem since they've last recharged the ac and its quite peculiar. Everytime the car cold starts, the ac will kick into high gear everytime but some other times like a quick pop into the store it'll be normal. I'm assuming it's something to do with VIDA but i dont have access to one. What are your thoughts on this?

wanderdüne · Post by **wanderdüne** » 29 Sep 2019, 08:24

Do you mean that the engine cooling fan runs at very high speed when the car is started? That is what mine did when the A/C had been overfilled with refrigerant. Here is my thread on that: viewtopic.php?f=10&t=85640&start=10

Not sure what you mean when you write that the A/C "will kick into high gear "? Please explain further.

Here is a link to download the VIDA:https://forums.swedespeed.com/showthrea ... nload-Link
I am not sure about where you would be able to purchase a cloned DiCE unit where you live? That's all you would need with the software download.

HafizBahar · Post by **HafizBahar** » 30 Sep 2019, 12:59

No, i mean the blower motor runs on full blast for the hvac, and when on startup it goes into auto mode without any driver input.

So this is how it goes on a step by step walkthrough:
1.turn ignition on nothing out of the ordinary
2.start the car
3.AC on auto instantly and is blowing air at full speed
4.I have to turn it down with the fan control knob manually

just wondering if anyone else experienced the same problem as me to be honest.

thank you for link wanderdune! am sure to get a dice sooner than later

wanderdüne · Post by **wanderdüne** » 30 Sep 2019, 20:44

There is a recalibration that one can perform of the Climate Control Module (CCM) using the VIDA/DiCE. The procedure is here: http://volvo-vida-2014.blogspot.com/201 ... volvo.html
I'm not sure if that would work for your issue and also there could be Volvo specific codes stored that could lead to understanding the problem. Those codes will not show up with a regular OBDII scanner.

You can still download the VIDA and input your car's information using it for general lookup and looking at repair procedures and such in advance of purchasing a DiCE. There's a lot to the system and it would be an advantage for you to familiarize yourself with the system.

In the meantime; you could follow this procedure; disconnecting and reconnecting the vehicle battery https://howardsvolvos.webs.com/miscissues.htm#207347288
the ECC mentioned is the same as the CCM in your XC90; just follow the steps. It might do something for your issue.

HafizBahar · Post by **HafizBahar** » 04 Oct 2019, 18:53

Thank you so much for the help! will definitely try it out soon on the old gal, i had never heard of the battery disconnecting procedure. XD Thanks for the help wanderdune. really appreciate it!

Post by **ggleavitt** » 05 Oct 2019, 08:23

So the question might be whether this is a normal thing or not? Could absolutely be, in Auto the cabin fan speed is temperature dependent.

If vehicle is warm inside and climate is set for Auto, fan is going to blow at high speed when first run in an effort to move some air and get the temp down as quickly as possible (to a point where it then becomes incremental speed manageable). If you were to wait a bit, fan should reduce speed on its own. If it does not after some time, then you might have a problem.

For anyone who ever mentions oddities with climate, first thing that comes to mind is to check and make sure the little grate above the 12v lighter socket is clean. There's a little fan behind that grate, sucks cabin air in for reference temp (little white dot behind the grate is a thermistor, leave it alone). Gently clean or vacuum that area, and do it on a regular basis.

I'm not sure you have an issue per se, as based on your last description. Getting a copy of VIDA loaded on a PC will certainly be helpful in advance of a DICE to connect to the vehicle.

**If you get VIDA loaded up you can enter your vehicle details and then select "Product Specifications" tab and the "Design and Function" drop-down. Go to 871: Climate Control Module (section 8, then 871) and select Function. Read the first part "controlling the climate in the passenger compartment". Auto climate is a somewhat involved thing. In re-reading your first post, the reason it's not full blast every time may also be intentional.

Last but not least, if it's behaving differently since you "recharged" the AC, then it might not hurt to double-check and ensure that whatever is in the system is correct.

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