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 Post subject: Re: Overheating...
PostPosted: Sun May 26, 2013 9:13 pm 
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lives at LUVTruck.com
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Location: Vancouver, Washington
Luvrv8 wrote:
Check grounds. If you have access to a mechanical temp gauge then I would think about installing that to help with diagnosis.

EDIT:

Looking at my manual it says that the temps are as follows
Just before the T = 149 degrees F
In between the E&M = 169 degrees F
At the end of the solid line under the TEMP = 221 degrees F

Now the manual says to run the truck until the temp gauge reeds 176 degrees ( around the middle of the M), disconnect the wire from the temp sending unit and test the resistance of the sending unit, it should be about 50 ohms.

I am thinking a bad ground is a issue if you think the truck is really not overheating and just indicating hot.


I'll do this tomorrow and see what it says. I'm also thinking about buying a new gauge just to see if mines bad. I had a set that had oil pressure, temp, and something else, but had no idea how to install it and left it at my parents house when I moved out 7 years ago. I'll have to see if it's still there.. I'm pretty sure there's a huge box of parts too. ha

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 Post subject: Re: Overheating...
PostPosted: Sun May 26, 2013 11:50 pm 
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Joined: Sun May 15, 2005 4:57 pm
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Location: Cornelius Ore
Dash gauge unit is easy to check. Disconnect the wire from the sending unit (under the intake manifold). With the key on it should read max "cold". Ground the wire to the engine block and it should read max "hot". This checks out the gauge itself. With the wire connected back up any other readings will come from the sender itself in the manifold.


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 Post subject: Re: Overheating...
PostPosted: Mon May 27, 2013 3:08 pm 
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egg wrote:
Dash gauge unit is easy to check. Disconnect the wire from the sending unit (under the intake manifold). With the key on it should read max "cold". Ground the wire to the engine block and it should read max "hot". This checks out the gauge itself. With the wire connected back up any other readings will come from the sender itself in the manifold.



I checked the gauge. It went to max cold when disconnecting, and max hot when grounding it, like you said it would. ;-)

I'm praying it's not my head, whether it be the head gasket blown, or the head warped. I don't see any chocolate milk though, the oil is just black. No coolant loss. I noticed the hose on the front of the head is either loose, or too tight, there's an oil leak right around it. (at least what looks to be oil)

I'll upload a picture in a minute here.

It actually looks pretty nasty. I cleaned it up a bit and can only see the leak coming from the tube, so hopefully it's not the head. haha

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 Post subject: Re: Overheating...
PostPosted: Mon May 27, 2013 4:15 pm 
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added pics

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 Post subject: Re: Overheating...
PostPosted: Mon May 27, 2013 4:36 pm 
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Location: Camarillo, CA
egg wrote:
Dash gauge unit is easy to check. Disconnect the wire from the sending unit (under the intake manifold). With the key on it should read max "cold". Ground the wire to the engine block and it should read max "hot". This checks out the gauge itself. With the wire connected back up any other readings will come from the sender itself in the manifold.

All that tells you that the gauge and electrical is working, we already know this from the previous posts. What we are trying to see now if it is working correctly.

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 Post subject: Re: Overheating...
PostPosted: Mon May 27, 2013 5:48 pm 
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Joined: Sun May 15, 2005 4:57 pm
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Location: Cornelius Ore
Luvrv8 wrote:
egg wrote:
Dash gauge unit is easy to check. Disconnect the wire from the sending unit (under the intake manifold). With the key on it should read max "cold". Ground the wire to the engine block and it should read max "hot". This checks out the gauge itself. With the wire connected back up any other readings will come from the sender itself in the manifold.

All that tells you that the gauge and electrical is working, we already know this from the previous posts. What we are trying to see now if it is working correctly.


Ok, it's called process of elimination. We just verified the gauge itself is working correctly. All thats left is the sender unit itself---is it lying to you or not. Either test it's resistance at several temp gauge readings like you said or just replace it. It should be an inexpensive part I hope.
Overheating issues with the Luv are two main items: Either the radiator is in fact clogged, or a leaking head gasket mixes combustion air into the water jacket causing air pockets and poor circulation. This is hard to detect because it happens gradually. You may hear the water gurgling through the heater if air is in the water, usually on start up. The water pump is designed to pump water, it cannot pump air.
Your oil leak seems to be coming from the valve cover gastet itself. Maybe around that half-moon piece that sets in the head. Put a dab of sealer at the junction of that piece and the head gasket when you replace the gasket. Another thing: Gasket looks to be a cork type, I had much better luck with the neopream rubber ones not leaking. Use that one if you have a choice and don't over torque the valve cover bolts when replacing. Hope all this helps.


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 Post subject: Re: Overheating...
PostPosted: Mon May 27, 2013 5:58 pm 
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I wouldn't worry about the valve cover too much at this point, if the head gasket is blown you will have to replace it anyway. Here is what I would do, get a mechanical temp gauge to see what the true reading is, if it is in fact hot then get the radiator repaired. If that does not fix it then its time for a head gasket. I personally would not continue driving it until you know it is not running hot by installing a known good meter. Other then that you are just guessing.

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 Post subject: Re: Overheating...
PostPosted: Mon May 27, 2013 6:00 pm 
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Location: Whittier, (So). Cal.
SkyyPayne wrote:

I noticed the hose on the front of the head is either loose, or too tight, there's an oil leak right around it. (at least what looks to be oil)



That hose is a coolant hose. You have an oil leak. Very well could be the cover gasket.

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 Post subject: Re: Overheating...
PostPosted: Mon May 27, 2013 7:10 pm 
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Thanks guys for the input. I'll replace the valve cover gasket as I noticed it is ripped when I went out there a few minutes ago. I'm going to have one of the local luvtruckr's drop off his radiator and see if that solves it. Hopefully it does and I'll just buy it from him.. heh

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 Post subject: Re: Overheating...
PostPosted: Mon May 27, 2013 10:34 pm 
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Location: Camarillo, CA
Is this a known good radiator?

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 Post subject: Re: Overheating...
PostPosted: Mon May 27, 2013 10:54 pm 
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Luvrv8 wrote:
Is this a known good radiator?


He's selling it pretty cheap, so I'll take it regardless. But he said it was working fine when it was in his luv. He'll let me test it out first of course.

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 Post subject: Re: Overheating...
PostPosted: Tue May 28, 2013 12:27 am 
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it was working good in my luv before i pulled the engine never had an issue with my cooling system

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 Post subject: Re: Overheating...
PostPosted: Wed Jun 05, 2013 3:13 pm 
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Ran the super coolant flush thru the system for a few days, cleaned it out somewhat, now it sits at just under 3/4, but still goes close to hot. Gonna wait until love4theluv gets back to me before messing around with it anymore. I may end up buying an infrared gun to check if it's really over heating.

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 Post subject: Re: Overheating...
PostPosted: Wed Jun 05, 2013 7:41 pm 
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SkyyPayne wrote:
I may end up buying an infrared gun to check if it's really over heating.


Did you ever buy a sending unit?


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 Post subject: Re: Overheating...
PostPosted: Wed Jun 05, 2013 8:15 pm 
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drummerforhire wrote:
SkyyPayne wrote:
I may end up buying an infrared gun to check if it's really over heating.


Did you ever buy a sending unit?



For the bottom of the manifold?

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 Post subject: Re: Overheating...
PostPosted: Wed Jun 05, 2013 8:36 pm 
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I have an oil leak just like this where it looks like its coming from either that hose or the valve cover. i dont know if you go there but Tonys Auto Parts on fourth plain sells the valve cover gasket for 13 bucks i went in to ask the other day, but they are gonna have to order it so it would take a day or two for them to get it, still cheap though.

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 Post subject: Re: Overheating...
PostPosted: Thu Jun 06, 2013 12:29 am 
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valve cover gasket and the half moon seals will stop that leak, and yeah the temp sensor under the intake, i can drop mine off when i bring the radiator over. as soon as i get it back from cleaning and leak testing i will shoot you a pm

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 Post subject: Re: Overheating...
PostPosted: Thu Jun 06, 2013 5:40 am 
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SkyyPayne wrote:
drummerforhire wrote:
SkyyPayne wrote:
I may end up buying an infrared gun to check if it's really over heating.


Did you ever buy a sending unit?



For the bottom of the manifold?


Yes. It was mentioned more than once that the sending unit could be putting off a false reading. They are cheap and easy to replace.


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 Post subject: Re: Overheating...
PostPosted: Thu Jun 06, 2013 9:25 am 
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drummerforhire wrote:

Yes. It was mentioned more than once that the sending unit could be putting off a false reading. They are cheap and easy to replace.


Called my local parts store and it's $30.00, pretty sure the guy didn't know what I meant so I'll look around online. I saw a few for less than 3.00 yesterday but for now they've escaped me. I'll have to look thru my history. Thanks again for the input drummer.

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 Post subject: Re: Overheating...
PostPosted: Thu Jun 06, 2013 9:31 am 
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What shop do you usually go to?

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