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 Post subject: Overheating Problem
PostPosted: Thu May 05, 2011 3:36 pm 
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Joined: Sat Apr 03, 2010 3:58 pm
Posts: 119
Location: Lawton, Oklahoma
Ok I've searched the site about this problem and I've checked LITERALLY EVERYTHING!!!! I have no blockage anywhere, not in the radiator, block, heater core or lines. Thermostat and radiator cap are both new. I don't have a clutch fan or A/C. I also have a fan shroud. The water pump is new and pumps water perfectly. The coolant is 50/50. Also the head-gasket is new.

I don't know if there is anything else to check but I have checked everything that I know of and everything I've seen on here.

Also, I have an aftermarket temp. gauge on top of the stock one so I know what the temps. are actually reading.

It takes a few minutes to warm up to 170 then after that it skyrockets to 200 in a few seconds.

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 Post subject: Re: Overheating Problem
PostPosted: Thu May 05, 2011 6:25 pm 
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How is the ignition timing and cam timing

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 Post subject: Re: Overheating Problem
PostPosted: Thu May 05, 2011 6:58 pm 
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Joined: Sat Apr 03, 2010 3:58 pm
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Location: Lawton, Oklahoma
Right where they're supposed to be at.

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 Post subject: Re: Overheating Problem
PostPosted: Thu May 05, 2011 8:38 pm 
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Joined: Tue Feb 15, 2005 12:37 am
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Location: Silicon Valley, CA
This is a dumb question but: Is your thermostat in backwards?

If you remove the thermostat and run without it, does the truck overheat? If not, something related to the thermostat is your problem.

The problem you describe sounds like water is not moving through the block so either something like the thermostat is blocking it, or it's not being pumped. With the thermostat out, and the radiator cap off, you should see the water flowing through the radiator.

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 Post subject: Re: Overheating Problem
PostPosted: Thu May 05, 2011 9:56 pm 
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Joined: Sat Apr 03, 2010 3:58 pm
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Location: Lawton, Oklahoma
Like I said everything works perfectly. Thermostat is in the right way and yes if I take it out it still overheats. And like I said the water pump pumps water like it should. I have no idea why it is overheating everything is in check. Other than shaving the head like .010 over its completely stock. And it is not running lean either.

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 Post subject: Re: Overheating Problem
PostPosted: Fri May 06, 2011 12:48 am 
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Joined: Sun May 15, 2005 4:57 pm
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Location: Cornelius Ore
A few more questions before I take a stab at it. When does it over heat: Setting there ideling? Cruising down the road at speed? Stock thermostat is 180 so it should operate about there normally. On a pressurized system 200 is not really overheating, 230+ is. How high does it go to?


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 Post subject: Re: Overheating Problem
PostPosted: Fri May 06, 2011 1:40 pm 
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Location: Lawton, Oklahoma
it overheats at idle and while driving. And it has reached 230 before.

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 Post subject: Re: Overheating Problem
PostPosted: Fri May 06, 2011 10:51 pm 
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Joined: Sun May 15, 2005 4:57 pm
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Location: Cornelius Ore
It still sounds like a circulation problem. Unless the radiator is new it could be partially plugged, with some circulation but not enough. When it is hot make sure the top radiator hose is also hot indicating water circulation. The bottom hose should also feel hot but only slightly cooler. I'm assuming there is no air trapped in the system somewhere. Does the heater put out heat like it should? Does running the heater on high help the overheating problem? Some of my thoughts.


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 Post subject: Re: Overheating Problem
PostPosted: Fri May 06, 2011 11:08 pm 
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Joined: Wed Sep 15, 2010 9:32 am
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Location: Prescott Valley Az
If what you say is true water is running correct. No blockage or pump problem I would go get a cheap temp gauge and see if it is your gauge that is faulty. if not it could be a belt problem of it slipping and not turning the pump correctly.

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 Post subject: Re: Overheating Problem
PostPosted: Sat May 07, 2011 8:00 am 
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Location: Lawton, Oklahoma
It's circulating the way it should. Both hoses feel the way they are supposed to. The heater works great and no it doesn't help the problem although it should. And as I stated in my first post I have an aftermarket temp. gauge. That's how I know exactly where my temps set at.

Today I'm going to work on it some more and see if I can find the problem.

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 Post subject: Re: Overheating Problem
PostPosted: Sat May 07, 2011 9:37 am 
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Location: Pelahatchie, MS
I bought a brand new name brand aftermarket temp gauge once upon a time, and it read exactly 40 degrees high once it started moving. I swapped everything on the car, since I was sure the new gauge was good. I finally decided to try a different gauge...

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 Post subject: Re: Overheating Problem
PostPosted: Sat May 07, 2011 11:44 am 
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Joined: Wed Jun 09, 2010 12:22 pm
Posts: 550
Location: Redfield SD
You probably have an air pocket in the cooling system.It happens a lot. After the truck cools leave the cap off and start the truck..it will burp the air out. You can also try to leave the cap off after it is cool and grab the lower radiator hose and squeeze it to get the air out.
I have also seen new thermostats stick..I worked in a parts store for two years..this happens more than you think.
Good Luck!


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 Post subject: Re: Overheating Problem
PostPosted: Sat May 07, 2011 8:01 pm 
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Location: Lawton, Oklahoma
well i have tried two thermostats and two radiator caps. And i have done the warm up and let the air out thing. And the aftermarket one reads even with the stock one also when it gets hot u can oen the radiator cap and it boils over like its overheated. I have had many overheating problems on cars but this one has me stumped.

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 Post subject: Re: Overheating Problem
PostPosted: Sat May 07, 2011 8:27 pm 
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Joined: Sat Dec 08, 2007 10:32 pm
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Location: GA
My 80 model has this same problem but it's worse when the head lights are on which leads me to believe bad grounds. The wiring and the connections in these old truck's are tired I just pulled the thermo and haven't tried to fix the problem yet, might want to check the grounds just a thought.


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 Post subject: Re: Overheating Problem
PostPosted: Sat May 07, 2011 9:15 pm 
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Posts: 119
Location: Lawton, Oklahoma
Grounds would only be a problem with the stock temp. gauge. The aftermarket one is just straight to the block no electronics besides the lights for it.

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 Post subject: Re: Overheating Problem
PostPosted: Sun May 08, 2011 12:17 am 
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Location: Sand Bernardino, CA
It reminds me of a friends motor that was bored too far over and was practically impossible to keep from overheating.

Other than that, could be a problem with the head or head gasket, even though you said you replaced it. Maybe it didn't seal? Maybe the head was warped? Have you inspected the plugs? Compression check?


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 Post subject: Re: Overheating Problem
PostPosted: Sun May 08, 2011 6:22 am 
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Location: GA
Have you pulled the radiator and had it checked or cleaned at a radiator shop? When I do start back on mine I'll probably try to buy a new one, Had mine cleaned about 15years ago and it wasn't in that good of shape then but it did help.


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 Post subject: Re: Overheating Problem
PostPosted: Sun May 08, 2011 7:56 am 
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Location: Great Falls, MT
What year Model is your LUV? I have two, an '81 with a single core radiator and a '79 with a double core radiator. My '81 will start to heat up if i leave it idling while I'm doing something, I don't mean at a traffic light but while doing something for a few minutes or pro-longed idling. When I start driving it again it cools back down. My '79 and my son's '80 both have double core radiators and so far we have had no problems with over heating. Does your LUV have a double or single Core ratiator? I haven't read all the post and I might spark a debate here but I don't think 200 degrees is to hot. Alot of today's oils are engineered to work their best at around the 195 degree mark. I wouldn't think 200 degrees would hurt your engine or gaskets. Like any vehicle, if it's going much beyond 210 then you need to do something for sure.

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 Post subject: Re: Overheating Problem
PostPosted: Sun May 08, 2011 12:17 pm 
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Now that all the others have been checked 1 pressure test the the system then if ok then you may have a blockage at the head or in the head gasket.

Now where is your temp gauge hooked up as placement can cause a different reading then normal.Also if you know somebody with a infrared temp gun and check the T-stat temp.

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 Post subject: Re: Overheating Problem
PostPosted: Sun May 08, 2011 3:31 pm 
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LUVTruck.com Lifer

Joined: Sun May 15, 2005 4:57 pm
Posts: 680
Location: Cornelius Ore
Wow, it looks like about everything has been covered. Basicly it boils down to one of two things: either the cooling system is not getting rid of the heat it is designed to do or--the engine is makeing more heat then the cooling system is designed to remove. Assuming the ignition timing is to spec and all, I would go with a double core radiator if you haven't already.
Also check for something dumb like maybe the fan blades installed backwards or something. It sounds like the heat is getting to the radiator but the water is not being cooled by proper air flow. Some more thoughts again.


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