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2004 Sienna Van overheating
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hmarinelli
Novice
Apr 24, 2013, 6:43 AM
Post #1 of 12
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2004 Sienna Van overheating
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My daughter's 2004 Toyota Sienna 3.3L is overheating. I replaced thermostat and hoses this weekend. Not the problem, still overheating, but coolant level does not drop! How difficult is it to replace the water pump on this vehicle?
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 24, 2013, 6:44 AM
Post #2 of 12
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Re: 2004 Sienna Van overheating
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You need to stop throwing parts at it and pressure test the cooling system to find out where the leak is positively.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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hmarinelli
Novice
Apr 24, 2013, 6:49 AM
Post #3 of 12
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Re: 2004 Sienna Van overheating
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As I said in the post, there is no leak!
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Hammer Time
Ultimate Carjunky
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Apr 24, 2013, 7:09 AM
Post #4 of 12
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Re: 2004 Sienna Van overheating
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Is it overheating when stopped or slow traffic or when you are at highway speeds?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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hmarinelli
Novice
Apr 24, 2013, 7:55 AM
Post #5 of 12
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Re: 2004 Sienna Van overheating
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Only at highway speeds. When I replaced the t-stat, I let it idle in my driveway for 20 minutes and it never moved off about a quarter way up the temp gage. That's why I thought I had fixed it, but I was too lazy to take it for an actual drive - I just gave it back to my daughter! She drove it yesterday and it heated up, but the collant level is still ful. So I'm figuring the collant sin't moving, which leads me to the water pump.
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Hammer Time
Ultimate Carjunky
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Apr 24, 2013, 8:04 AM
Post #6 of 12
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Re: 2004 Sienna Van overheating
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The symptoms are pointing to a radiator problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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hmarinelli
Novice
Apr 24, 2013, 8:28 AM
Post #7 of 12
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Re: 2004 Sienna Van overheating
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Ouch! I can check that pretty easily, but what can go wrong with a radiator if it isn't leaking. Actually, Monday, when I drained it to start reparing it, my daughter had put Prestone yellow anti-freeze in it, but what came out of the petcock was all pink. So that means nothing was flowing in the radiator. Why, because it's completely plugged or the pump isn't moving the water?
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Hammer Time
Ultimate Carjunky
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Apr 24, 2013, 8:56 AM
Post #8 of 12
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Re: 2004 Sienna Van overheating
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Radiators get crusted up internally over time and no longer disperse enough heat as they were designed to.
You can't see it and you can't flush it out.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Apr 24, 2013, 8:56 AM)
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hmarinelli
Novice
Apr 24, 2013, 9:45 AM
Post #9 of 12
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Re: 2004 Sienna Van overheating
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Thanks for the help. I'll check out the radiator before I do anything else.
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wrenchdawg
User
Apr 24, 2013, 9:53 AM
Post #10 of 12
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Re: 2004 Sienna Van overheating
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The symtoms point more to one or both of the radiator cooling fans not working. Check the fuse box under the hood for the fuses. Then check fan operation by turning on the AC. One of the fans should come on anytime you have the AC on. If you only have one fan it will have several speeds. After you let the engine get hot the speed should increase.
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Discretesignals
Ultimate Carjunky
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Apr 24, 2013, 10:28 AM
Post #11 of 12
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Re: 2004 Sienna Van overheating
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Inoperative cooling fans would cause low speed overheating.
Sometimes if you crank up the heater with the blower on full blast and the temperature starts coming down, that is a sign of a radiator problem.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
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Apr 24, 2013, 3:28 PM
Post #12 of 12
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Re: 2004 Sienna Van overheating
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This problem has nothing to do with a cooling fan. Please ignore that post.
Wrenchdawg, we don't need any help here. Please stop confusing the poster.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Apr 24, 2013, 3:29 PM)
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