LUVTruck.com

I just got my luv a month ago and finaly got it running. Ive got the 2 main radiator hoses connected and all other hose connections pluged with rubber caps, over heating!! I have no heater core in the truck i just want it bypassed and running.
the connection under the stock intake has been threaded and plugged.
does anyone know what i need to connect to get this thing cooling again?

I bet you need the bypass hose from the front of the motor back towards the heater core. I suppose you could hook it from the front of the head to the top of the intake, as I believe that is the end result of where the heater core comes back to the motor. My theory is that with no water flow through the heater hose system, no hot water ever reaches the thermostat to open it. You might also check to make sure the t-stat is working correctly too though.

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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)

MEPR: Man, my 4x4 makes all other LUVs look good

well being that just the 2 main hoses are connected and all others blocked it seems as if the water in the radiator is not flowing. im thinkin i need to connect that front connection to the top of intake like suggested. oh btw the t-stat was just replaced thinkin that was the problem. im going to try this bypass thing to see if that works. im going to leave the bottom coolant connecton on the intake plugged and see what happens

i was lookin through some threads and noticed that some of you have clutch fans on your 1.8
mine is a 81luv and it has a direct drive fan (no clutch) is this stock??

Did you test the new thermostat before installing it?
I've come across new ones that are faulty a few times.

Not that I think that is the problem,just something I like to point out from time to time.

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"You can't please everyone,so you've got to please yourself"

I think that line from the front of the head to the intake is the problem. The system is designed to have water flowing through there so the t-stat just isn't seeing any hot water to start opening up.

I too have gotten faulty new tstats, so if you still have problems its worth testing it in a pan of water.

On the clutch fan, the direct drive fan (4 blade) is stock. They might have put a clutch fan on trucks with A/C around 81 or so though. The easiest place to find one is from newer Isuzus usually with A/C. If you can find a Trooper or pickup with AC in the junkyard the fan should fit. I have one from an Isuzu Impulse car that is a tad shorter if you find space is an issue. Most stuff up to about 91 should fit if its on a 4 cyl.

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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)

MEPR: Man, my 4x4 makes all other LUVs look good

why not just take the thermostat out?you dont have a heater so you dont really need it.

Removing the thermostat can cause overheating problems as well.
Without restriction the water flows too fast through the radiator and does not cool properly in some cases.

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"You can't please everyone,so you've got to please yourself"

I had an overheating problem. Replaced the thermostat and it is somewhat better. Now it doesn't over heat. But with that being said, when I drive on the highway, the temp rides all the way up to the high side. Does anyone else have this happen to them? I put a bottle of watter wetter in my radiator to see if that helps. Otherwise, has anyone replaced the water pump before? Is it a bitch?

Emo

If you have a decent thermostat and none of your hoses are old, soft, and ballooning on you, then you probably either have a bad water pump or a clogged up radiator. (I went through 3 used ones before I finally got tired of fiddling with them and just bought a new one.) Using tap water mixed with coolant will plug them up a bit eventually, and if your coolant is old, it won't cool as efficiently as it should. Also a slightly leaky head gasket can cause trouble with cooling a bit too. So can a lousy fan belt that slips or isn't adjusted properly. Either way - you need to figure it out soon before you blow a head gasket and/or warp your head. G series engines don't handle overheating very well for too long. It's the old "aluminum head on a cast iron block" thing, I reckon.

Replacing the water pump is messy, but it isn't that difficult once you get the fan shroud out of the way, the radiator out, and the fan and pulley(s) off. And if you don't have a fan shroud, I'd be tracking one down and installing it, because it's necessary to have one to help properly cool your engine.

Im with 800xl on this. Im about 90% sure that the water actually runs out of the front of the head through the heater and then back into the intake and thus through the T-Stat. So if you dont have that stuff hooked up im betting thats your problem. So get a bypass hose from the head to the intake and see if that fixes it. Also fan shrouds are critical, if the fan dosnt have that it wont pull as much air.

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1980 LUV 4x4, going under re-construction...

I have the same freaking situation and its driving me freaking crazy. Whover had it before me omitted the heater core. Its T-ed off between 2 hoses and then to manifold. Ive done everything flushed block, electric pull/push fan, new water pump/thermostat. I dont know what the hell its doing i even put a resevoir on it so it sucks it back up after it cools the hell off. I just got my new heator core in the other day but in my trusty Haines manual I cant find a diagram any where how thi thing is suposed to route. Can some one send a pic of theres or diagram or something. I could figure it out im sure but I really dont feel like trouble shooting! Lazy ASS I know!

Mine used to do the same. on an 80's gague, it would show the pointer at the end of the P for a 5-hour 65-70mph drive. I tried installing a 160deg t-stat vs the 180deg stock, and it keeps it running cooler around town, but still too hot for comfort on the interstate.

I just pulled out the plastic belt-fan and installed a crazy fast electric blower fan (Its so loud, it sounds like a turbo).


Is this true even if you have a blower? I have mine pulled off, but if I still need it with an electric blower, I'll put it back on.

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-1979 LUV 4x4

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-1979 LUV 4x4

Gee-willickers...IMHO you guy sure go through a lot of trouble just to cool down your trucks. Talk about going out the front door and running all the way around the block just to get to the back door of the house..lol

I kid...I kid...lol

The only advantage I personally can see to having an electric fan (besides gaining a little elbow room) is to try to gain a little hp/torque together with improving your gas mileage a bit by reducing the drag a bit on your engine. But the extra draw on your alternator is going to rob some of that back, plus IMHO you'd better plumb/wire in a temp switch to turn it on and off because it seems to me that running the cooling fan constantly is gonna cause a heck of a draw on your electrical system and you'll eventually wear out the brushes in your alternator and/or burn out the cooling fan motor. And yep...you'll still need a fan shroud to direct the flow over your radiator.

But if you've got it all plumbed right, and you have a decent radiator, fan, fan belt, fan shroud, hoses, thermostat, water pump, heater core, gaskets, etc - then unless you've got a leak somewhere - it should all cool your engine just fine. These little trucks normally run a bit on the cold side if everything is functioning and dialed in right.

There's other things that can effect your engine's cooling too, like incorrect timing, a bad fuel/air mixture, etc....so you might wanna check those too. And if you ever have to pass smog, I seriously doubt if that will happen with a radically modified cooling system.

I have to burn premium gas with my built Impulse 1.9 G200z motor and I drive it hard, taking it up into the higher rpm's frequently. The only thing I did to my truck's cooling system other than stock was put a tiny bit bigger radiator and a flex-fan in it, and my truck has never got hot on me - even when I've pulled a loaded trailer together with a bit of a load in the back of the truck going up and down steep hills on the freeway on a hot as hell day. And getting stuck in rush hour traffic in the hot sun doesn't seem to bother it much either.

No offense meant guys, and I don't mean to come off sounding like a grouchy old fart, but IMHO it sounds to me like maybe you guys should stop trying to re-invent the wheel or stop trying to build a better mouse trap...and just study your manuals a little bit so you can properly diagnose the problem and just fix it right.

But again...that's just my $.02 worth. Take it or leave it, because it's your truck.

No offense taken taz. I have two objectives when I work on my truck.

1) skimp on it so it barley works
OR
2) Go all out and make it rediculous

for example,

-Need a way to mount an alternator, use a 7/16in wrench, or have a custom arm built...
-Want too add extra lights. Get 2x 45 watt fog lights, or 4x100Watt Off-roaders...
-Need some radio. put in a free CD player I find in my garage, or get a 52x4, 3-way's and 2x12in Subs along with an XM Radio Subscription to go with it...
-Engine getting a little hot. Just fix it, or fix it and add a crazy loud cooling fan...

(Can't wait till I upgrade my horn...)

And yes, I have it behind a Relay controled by a switch that isn't activated unless ignition is on. That way I can leave it off in the winter time.

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-1979 LUV 4x4

LMAO! Well...different strokes for different folks I guess...lol

NP...it's all good.

It's just sometimes some new or inexperienced Luv owners don't listen too well around here, or think and/or do their homework before they speak, and it gets a bit irritating to watch (or be...lol) one of the long-time members and Luv owners trying to reason with them. It can be a little like trying to push a loaded semi with a straw sometimes, and it gets me a bit cranky.

I'll get over it. It's only a shallow wound and it's too far from my heart.

You have to start somewhere. I bought my LUV back in 2005 because I wanted to learn about cars. I think I have come a long way. I've gotten to the point where people ask me questions about their cars. I always tell them "just because I have a crappy truck, doesn't mean I know about cars" although I have learned a ton.

I know my fan is way overkill, but I have been wanting to go electric fan, and this one was offered to me, so I went with it.

Thanks for your help!

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-1979 LUV 4x4

I have a rebuilt stock 78. I rebuilt it and had the radiator redone. I ran all new hoses to the stock locations and a new thermastat as well. I can not get my truck to run hot enough. It runs right on the thermastat and I can even tell the thermastat closes by watching my temp gauge and that is at 75 on the freeway at 90 degrees outside. The moral of the story, run the cooling in the stock formation and have a properly tuned engine and the stock cooling system is going to keep it in the right temp (or in my case over cooling).

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Certified pilots, looking down on people since 1903.

Just a quick question, I dont mean to hi-jack i just thought this was an appropriate thread for this.

What does everybody use in there V8 swap kits to stay cool? what radiator out of what?, and type of fans- mechanical or electric?

Im running the stock 4 banger rad with my V6 and it actually runs too cool for my liking even in our 101* heat were having right now. But I will be upgrading soon and i have cooling concerns.

A.j.

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