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Discussion Starter · #1 ·
Looking for a little Advice

I have been lurking onthe forum a while and am an avid Volvo enthusiast. I have a rcently purchased a 2007 XC90 V8 Sport and LOVE IT! Amazing car and truly under rated. So on to the issue......

Yesterday running some errands with the lady friend in a hot 95 degree day. AC worked fine for the first half of the day. We stopped at a store for 20 minutes and jumped back into the car.

After A couple blocks i noticed the air wasnt blowing cold after it had been intially, so I dropped the temp to ICE COLD and the fan to full blast.

After 4 more blocks I noticed the air wasnt getting any cooler. So we had reached our destination to pick up dinner and I saw steam coming from the passenger side of the engine bay. I immediately shut down the car and see the Coolant Resivoir is over flowing, or the car as I would believe is over heating.

I park the truck let it cool off no damage I caught it before the truck actually overheated. I filled it with coolant and drove it several blocks back home with the heat on full blast and no issues.

My father a mechanic and Volvo lover advised me to go outside and run the car with the AC on Full blast to see if the car temperature would go up and start to overheat. We believed the Thermostat got stuck....

Well the truck didnt over heat but the AC is blowing HOT AIR. WHAT could be the issue??? I checked the #11 Fuse and it was not blown. However the AC doesnt "Tick"on anymore.

Although it is hot, my concern is the overheating prior to the AC working. However I would like to resolve both issues. Any suggestions? Why did the truck over heat through the coolant resivoir?
 

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Ac is probably the clutch. There are plenty of right ups on how to adjust the shims in the clutch to get it back to the right gap.

The over heating is of a larger concern. Did the temp gauge ever pass half way on your date or when you tested it in the driveway? Also what is your fluid level when the car is cold? The coolant reservoir is designed to release excess pressure that can be caused by the system being overfilled when cool or when the coolant becomes excessively hot which increases the pressure inside the system.

The two events maybe unrelated, but I think that these cars are smart enough to detect an overheating situation and trigger the heater in order to remove heat from the coolant (I know in my 06 manual it says that if the car starts to overheat to turn the heat on full blast). I would wake up early one morning about an hour before sunrise, roll the windows down (ac switched off) and take it for a long drive to see if it tries to overheat again.
 

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Discussion Starter · #3 ·
RaymanSean Thanks for the reply.

I will try to get the same results by driving it out around, interesting you think it’s possible the two issues are unrelated. I guess that could be the case and I didn’t think about it that way. I will look into adjusting the AC Clutch Pulley to see if that addresses the lack of cold air and the compressor engaging.

When I was driving I got 0 warnings actually and pay attention to everything about the car when I drive. I got caught once and through a main bearing ever since then I listen to my cars like whispering babies.

The actual events went as follow.

1. I pulled over car on, AC blasting barely cool air coming out. As GF was getting out I noticed steam coming from the coolant reservoir area and immediately shut the car off. Nothing had gone off on the dash up to this point.

2. I popped the hood after shutting off the car. I noticed the reservoir was over flowing and was steaming heavily. So I was shocked that none of the cars sensors went off, especially a Volvo which is fairly electronically advanced.

3. While the hood was open and before I went to buy coolant, I put the key in the car and turned it to the ON position to see what would light up on the dash as I didn’t see anything while driving. The indicator for low coolant came on right away; notifying me the coolant level was low. I also looked at the cars temperature gauge and notice it was high but it wasn’t at the "Red" Hash of death, it was actually just below it.

After that left the hood open for the car to cool off, put in more coolant, turned the heat on full blast and drove it back home with no issues.
 

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Discussion Starter · #4 ·
Found the culprit. The electrical fan was not kicking on and it was causing the truck to overheat and also not allowing for the flow of cool AC air.

Tested the terminal and the power connect was good, hit the back of the fan with a pry bar and knocked some debris out of the fan area and wouldnt you know it flicked back on. No more overheating and no more AC issues.

So my question to you guys is, should I replace the fan or was it stuck?? A new fan from volvo runs $370 and suggestions for replacement?

Thanks for the help guys!
 

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Found the culprit. The electrical fan was not kicking on and it was causing the truck to overheat and also not allowing for the flow of cool AC air.

Tested the terminal and the power connect was good, hit the back of the fan with a pry bar and knocked some debris out of the fan area and wouldnt you know it flicked back on. No more overheating and no more AC issues.

So my question to you guys is, should I replace the fan or was it stuck?? A new fan from volvo runs $370 and suggestions for replacement?

Thanks for the help guys!
get all the debris out! I would be tempted to remove the fan, remove the rad and the condenser and give that whole area a good cleaning. Be careful not to get the engine wet (search for 2005 V8 CB shaft bearings)! Chances are it was just stuck, you may have a bad spot in the fan motor, but those can be hard to find w/o some high speed test equipment.
 

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Discussion Starter · #6 ·
get all the debris out! I would be tempted to remove the fan, remove the rad and the condenser and give that whole area a good cleaning. Be careful not to get the engine wet (search for 2005 V8 CB shaft bearings)! Chances are it was just stuck, you may have a bad spot in the fan motor, but those can be hard to find w/o some high speed test equipment.
Yeah gonna get in to cleaning it with some compressed air. I will drive it around and give the Lady friend my car to use so I can see if the issue resurfaces or if it was a a chance situation, although replacement looks pretty easy. My truck is a 4/2007 build date "2007 Model" so it should be free of the CB Shaft issue as it was fixed by Volvo for 2007 models. However I am not an advocate of washing engine bays in general just causes problems, I would rather keep it clean from the beginning.

Cheers and thanks again!
 

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My truck is a 4/2007 build date "2007 Model" so it should be free of the CB Shaft issue as it was fixed by Volvo for 2007 models. However I am not an advocate of washing engine bays in general just causes problems, I would rather keep it clean from the beginning.
The only thing we have heard for sure is that a weep hole was put in place. Others have speculated that the bearing specs were changed after 05. None the less, it is still a sealed bearing design buried deep between the heads. In hindsight not such a good design choice given the damage that a failed bearing causes. You are right to not wash an engine down, especially the Volvo V8.
 

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Overheating while idling associated with hard shifting

We have a 2007 XC90 Sport as well. Recently had the thermostat replaced along with a couple other things because it was overheating. Also, since this summer Scarlett (XC90's name :) ) would shift very roughly between 20-40 mph. Now its is getting worse and within the last couple weeks she overheats mostly when we are idle. It will reduce heat significantly once we start trucking and the wind gets to it. Does anyone think these could be affecting eachother? I am going to check out our electrical fan but I am really concerned about the hard shifting. Any suggestions?
 

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The transmission cooler goes through the radiator. If your car is overheating, coolant is boiling and affects the quality of the ATF as well as engine oil.

Fix the overheating and then do a comprehensive fluids and filters service.
 

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Hey! So we ended up having to replace the entire fan assembly. We had a 75k service done which I assumed include the transmission flush but either way, transmission is working smooth. Thank goodness!
 
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