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Gweedo's
New User
Jul 20, 2015, 3:19 PM
Post #1 of 8
(1777 views)
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Overheating venture
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Hi all you were great at helping me out solving my "what is it" post, I'm really hoping to find the answer to an overheating problem. It is a 2000 chevy venture with 214080 kms and I have replaced the head gasket, intake manifold gaskets, had the heads machined, heater core, thermostat, and just had the radiator flushed and filled today. The technician said the system was holding 15 lbs and absolutely no leaks that are visible. I checked my work on the thermostat and it is dry as a bone. I get tons of heat thru the interior heat which is new after the thermostat was replaced. My only guesses as to what the issue could be at this point is either the sensor or water pump. The water pump is quiet and dry and when I rev the engine when it gets hot the temp drops back to what I call average range. I don't let it get above 3/4 on the temp gauge before it rev the engine and get it back down. I am confused and do not want to ruin the $2600 engine rebuild. Hindsight 20/20 shoulda bought something else but now it is a battle and I want to win! LOL Any ideas would be helpful. Thanks all!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 20, 2015, 3:48 PM
Post #2 of 8
(1768 views)
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Re: Overheating venture
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OK - take it that it at least reads hot or hotter than you recall from before - right? WHAT ENGINE IN THIS?
It's not a rebuilt engine now just a top end job but seems to check tight coolant wise and heater blows heat so probably is full enough on coolant. If just done and this you have to know it's truly filled not just recovery tanks and some are hard to burp out last air.
Fan(s) must work and can be normal at high end of a safe area on dash gauge. Probably best to know real temps at engine's thermostat housing and that thermostat both holds tight when cold then opens and you feel the heat going out to radiator when it opens. New isn't 100% that it's good or installed properly.
Did you do the thermostat? Are you convinced it's the right one and no errors made never mind if it leaks?
This kinda sounds like fans aren't working or maybe still air in system?
How new is all this or how long finished with this work before noticing this? If just done and real hot where you are you may be normal and verify real temps with a touchless thermometer.
Didn't check where your message was routed thru but I'm in New England and it was dang close to 100F for a short while today here and vehicles cooling systems must be up to par or it shows up on days like this.
IDK for you yet. Either nothing really wrong or what I already mentioned,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 20, 2015, 4:42 PM
Post #3 of 8
(1761 views)
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Re: Overheating venture
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We see this complaint a lot when there really isn't anything wrong. The fans are programmed to come on about 226 degrees which will seem real hot to you but it is not. They are intentionally designed this way.
As Tom suggested you really need to know the exact digital temp. Don't get concerned unless it passes 230 which may be pretty high on the gauge.
The best way is with a scan tool where you can monitor the actual sensor temp and fan request.
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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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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 21, 2015, 12:37 AM
Post #4 of 8
(1753 views)
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Re: Overheating venture
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Had a busy day HT - checked this is from Winnipeg and some recent temps spiked near 90F. Not surprised as poor cars have to put up with some extremes both ways and easy to forget you need a fan at all for a radiator!
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 21, 2015, 2:06 AM
Post #5 of 8
(1750 views)
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Re: Overheating venture
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Sh!t, that's a cool day for us. We've had 2 weeks of mid 90s with heat index at 100 to 105.
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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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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 21, 2015, 5:20 AM
Post #6 of 8
(1740 views)
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Re: Overheating venture
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Add to that, that you are adding heat using A/C if you have it system is working hard or even if a non A/C vehicle (OE) may have less of a radiator for the thing. Off season and or running heater temp gauges on even this type vehicle wouldn't move from the same spot sometimes even sitting still in a traffic jam. This since the work on now paying more attention when maybe didn't for ages so IMO and yours too as said may be in range of NORMAL for this vehicle,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 21, 2015, 5:53 AM
Post #7 of 8
(1737 views)
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Re: Overheating venture
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The normal range at highway speeds is 195 to 200.
The normal range in traffic or idle is 220 to 230
Those are the temps it was engineered to run at.
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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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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 21, 2015, 7:28 AM
Post #8 of 8
(1734 views)
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Re: Overheating venture
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OP - That nicely spells out what is normal for this and many. This also means your pressure cap on radiator or if on recovery tank MUST hold it's rated pressure properly AND allow return of coolant when it cools down. Any questions about that toss it for a new one............They can be tested but barely worth it IMO,
Tom
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