Why does my Van overheat when running idle?

250

Asked by May 04, 2012 at 07:55 PM about the 2005 Toyota Sienna XLE

Question type: Maintenance & Repair

When I run the A/C then park my van, it slowly starts to overheat. I see the temperature gauge go from the middle to hot. The air coming out of the vent also goes from cold to warm. When I put the van back in motion, it cools down and goes back to normal. Any ideas as to what is going on?

8 Answers

12,765

Your fan is most likely not working. Check to see if the fan comes on when the engine gets up to temp. If not things to check are fan relay fan fuse and wiring and the fan itself.

13 out of 13 people think this is helpful.
250

Why would the vents pump out cold air when the van is driving if the fan was not working? Is there a corolation there?

3 out of 3 people think this is helpful.
1,975

There are electrically operated radiator cooling fans to cool the radiator. If they don't come on, your van will overheat when it is not moving forward, to cause cool air to be forced through the radiator.

2 out of 2 people think this is helpful.
12,765

We are talking about two different fans. The fan that cools the engine (cooling fan) and the fan that cools or warms the interior (blower motor). The cooling fan is the one I was referring to this one is thermostatically controlled. When the engine gets up to temp the cooling fan kicks in. The fan you are referring to is the one that controls interior temp. This one runs depending on user input.

3 out of 3 people think this is helpful.
110

I have the same problem but I do notice that both engine fans are on when its hot.

11 out of 11 people think this is helpful.
10

Hey I have the same problem but I look and find out one was not working but I try to make it spin and it work again I am going to see if it doesn't stop again let's see how it goes.

1 out of 1 people think this is helpful.
40

My 2004 Toyota Sienna cue coolant gage rises when I'm at a stop light then when I go it goes back to normal.. Why is that and will it be a easy fix?

4 out of 4 people think this is helpful.

I'm also having this problem with my 2004 Toyota Sienna LE with about 160K miles. Had the water pump and timing belt replaced around 120K. There does seem to be a small leak somewhere in the cooling system as I have to refill a little bit (maybe a pint or two) every few months, but this doesn't seem to be a bad enough leak for me to investigate further. However, the fact that the AC air in the passenger compartment gets warm when the vehicle starts overheating makes me think it might be related to the AC compressor. When initially starting the van, we typically have some belt noise (squeeling) for a minute or two. I've tightened the belt a little once before, which helped, but then the squeel came back. So if a worn AC compressor is adding load to the engine, would that cause these types of symptoms with the AC temp in the vehicle getting warm as the car overheats? The other thing I've seen online is that the radiators get corroded after a while and need to be replaced. You have to check the temp at the top and bottom to see if the flow is adequate and whether the radiator is working properly or not. Hairline cracks in the plastic radiator sides could also be causing the small leak I'm seeing as well as pressure leaks that would cause the cooling efficiency to drop. A pressure test would probably confirm if this is the case or not. Anyone else have thoughts/comments/experience with this? Thanks!

Your Answer

Add photo

Related Questions

Sienna

Looking for a Used Sienna in your area?

CarGurus has 28,967 nationwide Sienna listings starting at $1,648.

ZIP:

Search Toyota Sienna Questions

Toyota Sienna Experts

#1 Mik00000
Mik00000
Reputation 1,570
#2 Tom Demyan
Tom Demyan
Reputation 1,160
#3 dandyoun
dandyoun
Reputation 860
View All

Related Models For Sale

Used Honda Odyssey
228 Great Deals out of 23,250 listings starting at $1,995
Used Toyota Highlander
340 Great Deals out of 24,019 listings starting at $2,192
Used Honda Pilot
342 Great Deals out of 20,930 listings starting at $2,199
Used Dodge Grand Caravan
289 Great Deals out of 29,032 listings starting at $1,850
Used Toyota Camry
966 Great Deals out of 89,959 listings starting at $750
Used Chrysler Town & Country
318 Great Deals out of 16,998 listings starting at $1,600
Used Kia Sedona
102 Great Deals out of 8,279 listings starting at $1,900
Used Nissan Quest
65 Great Deals out of 2,687 listings starting at $2,499
Used Toyota RAV4
736 Great Deals out of 70,811 listings starting at $1,895
Used Toyota 4Runner
244 Great Deals out of 20,471 listings starting at $1,995
Used Toyota Corolla
733 Great Deals out of 71,823 listings starting at $1,995
Used Toyota Tacoma
499 Great Deals out of 40,030 listings starting at $1,988
Used Toyota Sequoia
155 Great Deals out of 5,651 listings starting at $3,350
Used Honda CR-V
911 Great Deals out of 60,638 listings starting at $1,800
Used Honda Accord
796 Great Deals out of 85,752 listings starting at $1,100

Used Cars For Sale

2017 Toyota Sienna For Sale
3 Great Deals out of 19,211 listings starting at $26,521
2016 Toyota Sienna For Sale
14 Great Deals out of 986 listings starting at $21,784
2015 Toyota Sienna For Sale
45 Great Deals out of 1,396 listings starting at $14,999
2014 Toyota Sienna For Sale
45 Great Deals out of 1,782 listings starting at $11,495
2013 Toyota Sienna For Sale
19 Great Deals out of 674 listings starting at $10,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.