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Discussion Starter #1
New thermostat (dealer)
New radiator cap (dealer)
Flushed cooling system (driveway).
Fan clutch replaced 1 year ago.
Water pump replaced 1.5 years ago.
Any Ideas????
Around town it is fine. When i get on the freeway and maintain speed(5th gear at 3400rpm's with 5.29's)it starts to heat up.
It has always stayed below halfway on the gauge, even through the hottest suumer in Phoenix. Now it's gettin up to 3/4's on the gauge. I am watching it non stop as i drive.

Any advice?
 

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Is it loosing coolant maybe headgasket leaking? The timing could be off causing it to over heat?
 

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It's a longshot, but what about the sending unit or the gauge itself? Seems like you've checked out everything else. Do you have an SR5 cluster? I've got a couple standard instrument panels, you could swap one in and see if it's any different. May even have a sender somewhere...... <IMG SRC="smilies/biggrin.gif" border="0">
 

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Originally posted by EricZ:
<STRONG>New thermostat (dealer)
New radiator cap (dealer)
Flushed cooling system (driveway).
Fan clutch replaced 1 year ago.
Water pump replaced 1.5 years ago.
Any Ideas????
Around town it is fine. When i get on the freeway and maintain speed(5th gear at 3400rpm's with 5.29's)it starts to heat up.
It has always stayed below halfway on the gauge, even through the hottest suumer in Phoenix. Now it's gettin up to 3/4's on the gauge. I am watching it non stop as i drive.

Any advice?</STRONG>
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Had the same problem .... check the radiator for clogging. Mine had a minor clog, but good enough to slow down the circulation of the coolant and make the truck run hot. Try having it pressure tested and boiled out.
Good Luck !!!
<IMG SRC="smilies/bounce.gif" border="0"> <IMG SRC="smilies/bounce.gif" border="0"> <IMG SRC="smilies/bounce.gif" border="0">
 

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Get a new radiator. Mine was recently doing the same thing, fine around town, fine crawling, topping out on the highway.
Once I pulled the rad, I saw that lots of fins had rotted away, and a few tubes were crushed.
 

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if it is clogged you should be able to find cooler spots on it than the rest. wait for it to cool a little though before you check obviously. That was the first thing my dad had me check when mine overheated, and it did so we took it in to get cleaned really good, and then it worked fine
 

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Discussion Starter #7
Originally posted by j4x485:
<STRONG>Is it loosing coolant maybe headgasket leaking? The timing could be off causing it to over heat?</STRONG>
No coolant in the oil, motor is still strong,
it does not act like a head gasket. I'm leaning towards a restriction in the radiator causing a slow flow through the system.

[ 08-27-2001: Message edited by: EricZ ]
 

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Sounds like a radiator restriction to me. I have a shop that seems to do a good job. Bring it be the shop and I'll check it out for you. <IMG SRC="smilies/smile.gif" border="0">
 

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I've got the same problem. My entire engine is new including the radiator. Less than 10K on it. I only started noticing this happening after the 4.88's and the swampers were on though. when it was stock with 31's, the mother trucker was tip top. <IMG SRC="smilies/biggrin.gif" border="0"> I'll keep an eye on this post. <IMG SRC="smilies/eek.gif" border="0">
 

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Mine was getting hot so within two weeks I replaced:radiator,fan clutch,water pump,thermostat(then gutted thermostat)finally put in autometer elec temp gauge.True temp was actually 185 degrees.Sucked to be me.
 

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I had a similar problem. My old radiator was plugged and I couldn't get it cleaned out. I replaced my radiator with a BAP all metal radiator with lifetime warranty for $100. Runs perfect. Also my toy ran much hotter when I didn't have the fan shroud on.

Jeremy
 

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i also have the same problem in my 4runner. everything is new dealer parts, and i have a 3 row rad. it runs at 210 on the freeway and cool everywhere else. the guage in the dash doesnt rise at 210, but very shortly after. Funny, i always thought 210 was a little hot. I also run 32x11.5 with stock 4:10's.
gave up on that and trying to get rid of a nasty miss.
 

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Discussion Starter #13
Originally posted by kongs4x4:
<STRONG>Sounds like a radiator restriction to me. I have a shop that seems to do a good job. Bring it be the shop and I'll check it out for you. <IMG SRC="smilies/smile.gif" border="0"></STRONG>
Thanks but i'm gonna pick one up from Hawk's Radiator. I've bought 2 from them for other vehicles and they always have low prices for quality products.
 

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My unk did the same thing this weekend :9 Seens like a command problem?
I'll have to get the rad cleaned:O
 

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Mine was doing that couple of months ago. replaced the radiator and it went back to running normal. All except for the head gasket that is about to go. dont know if I got some warping, or if it was from my previous rebuild when the chain snapped. If it is using fluid dont count the head gasket out. I am getting that done this month with metal guides and all and hope to be good for another 150,000
 

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Originally posted by EricZ:
<STRONG>Around town it is fine. When i get on the freeway and maintain speed(5th gear at 3400rpm's with 5.29's)it starts to heat up.
It has always stayed below halfway on the gauge, even through the hottest suumer in Phoenix. Now it's gettin up to 3/4's on the gauge. I am watching it non stop as i drive.

Any advice?</STRONG>
That is the clue that points to a clogged radiator. Exactly the same symptoms I had. As long as the flow is below a certain point the radiator works fine, get past that point and the cooling efficiency goes down due to turbulant flow and it overheats. New radiator or get the old one rodded out. I got a new 3-row (GoDan 2041) radiator and its worked great. My old radiator tank was damaged so rodding out was not an option.
 

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Discussion Starter #17
Originally posted by Trail Toy:
<STRONG>....dont count the head gasket out. </STRONG>

SHUT UP! I cannot afford it to be the head gasket at this time!!!
 

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Hawks is the company I use. Pretty good service. I heard your truck run under load in the canyon saturday and your head gasket is just fine. <IMG SRC="smilies/tongue.gif" border="0">
 

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You can spray water on the front of the radiator when it's warm, if somethings plugged up it won't evaporate from that spot.
 

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Eric,
I'd put a $20 temp guage on it before I did anything. I put one under my dimmer switch on mine. real easy to do. The guy I bought my truck from blew his head gasket and head and the guage still read normal. Turns out it was far from normal. It's cheap insurance is how I see it. Even if your 15+ year old guage happens to be OK, it's still nice knowing that I run 190 pretty much all the time. Then you can go from there.
 
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