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Discussion Starter #1
HI All,
I recently purchased a 94 f150. The truck was cheap and needs some (hopefully) minor work. The main problem is i can not seem to stop it overheating. I've replaced the radiator , radiator cap, thermostat, coolant, even pulled off the water pump - all the cooling system seems great. Also checked the fan, shroud, and anything else I can find - all is good. I'm thinking it could be a blown head gasket? Any thoughts? There is no water in the oil, or oil in the water, the truck runs great but overheats in traffic and open roads. the motor seems pretty stock but does have edelbrock performer heads, roller rockers, and headers which were fitted a long time ago.
Any advice would be much appreciated
Cheers
Galman
 

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Discussion Starter #3 (Edited)
The engine definatly overheats!. I'll start the truck , from cold , drive it for about 15 minutes. All the while the temperature gauge continues a steady progression from cold towards hot. usually i'll stop before it gets to hot but if the distance is to great, the radiator cap will start to release pressure or when i stop it blows its load! Driving through traffic or on opens roads has no effect on the progression towards hot.

I'm thinking maybe a compression test to check for a low cylinder??

Not having delt with much efi stuff in the past I'm a bit nervous about striping the motor down. I suppose, in the end , its still just a windsor!

P.S. good evening Gary
 

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Not evening for me, you're seeing things all upside-down :D :D

Has your engine had any work done to it before you got it?

Could the head gaskets be on backwards?

What happens when you FILL the radiator with coolant, LEAVE OFF the Cap, then start it and let it idle?

How much water comes out and when does it seem to get too hot while idling and not driving?

Is the FAN mounted in the CORRECT direction? Or is is BLOWING the air back into the radiator?
 

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Is it possible that the engine has a reverse rotation water pump on it, or that it needs one and the engine has a conventional one?
I believe that Ford used both types, and the reverse rotation ones were used around that time.
 

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engine must be Hot to completely fill the cooling system . on crossflow rad's you can see the flow thru the neck. . pressure test the cooling system first, will tell you more than a comp. test
 

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Had a '95 that the fan clutch took a dump. Same symptoms. Thermostat also failed at about the same time. 5.0 and a 5 speed reg cab....same basic system as a 5.8...and well the 4.9 too for that matter. Also had a 94 with a 4.9 BIGSIX (loved that engine) that would get warm. Previous owner never flushed the cooling system and the coolant got rusty, then clogged up most of the small holes in the head gasket. The bigger ones were ok but the little ones were plugged. Oh and BTW the head is HEAVY if you're trying to lift it off by yourself with the engine in the truck. I think I still have back pains from trying to do it by myself and that was over 10 years ago. But it was a great truck and I wish I still had it.
 

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Discussion Starter #9
Hi all,
I've been thinking about the overheating problem more, but to answer a few questions first.
1. The truck has had work done to it before I got it, after all it is a 94 model. I dont know where or when though. The edelbrock heads on it appear to have been there for some time.
2. Headgaskets on backwards? wont know until I pull the heads off. I did think of this but, again , does appear to have any work done recently.
3. with the radiator cap off the radiator does seem to have a regular small air bubble come up. Could be the problem. Maybe blown head gasket or cracked head? I think this is the key.
4.Not sure of water loss while driving a bit hard to see from the drivers seat. May have to get the misses to hang on the front as I go for a drive!!
Also it gets hot idling, cruising or sitting in traffic.
5. fan seems fine. Blowing heaps of aironto the motor.

Lastly, it should have the reverse water pump on it (forgot to check actual direction when I have off on the weekend). Easiest way to tell which one it needs is - if it has the serpentine type fan belt and the BACK of the belt drives the fan pulley , you need the reverse watewr pump. I dont think you can physically fit the wrong one - timing covers different too?
 

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Discussion Starter #10
I'm thinking the lightly bubbling radiator is the key. Should I then, do a TK test ( exhaust gases in coolant test) and then maybe a leakage test on each cylinder (see if the compression drops)? I dont think a standard compression test would be much use??? or would it?

Any further ideas would be great.

By the way, I dont have a good mechanic that i use regularly ( usually attempt most things myself) but did a little checking around , seems the standard price now for mechanical repairs is about $120.00 per hour for labour ( $110.00 U.S.) Doesn't that seem huge?!?!

If you can recommend a good repair shop in Perth Western Australia, please go ahead. I rather go to someone who i know will do a good job than pay some dodgy repair shop down the road!

Thanks again
 

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Standard Price for Mechanical Repairs in the USA right now is about $85.00 US funds per hour. There is a national average website somewhere but I'm too bothered to look.

One Dealership in California, a ROVER dealer charges $144 bucks per Hour! The rest are right at $90 and $95. Here in Washington DEALERSHIPS are at $95 dollars.
While Auto Repair shops are averaging $69 to $83 dollars per hour across the board.
 

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Hi all,
I've been thinking about the overheating problem more, but to answer a few questions first.
1. The truck has had work done to it before I got it, after all it is a 94 model. I dont know where or when though. The edelbrock heads on it appear to have been there for some time.
2. Headgaskets on backwards? wont know until I pull the heads off. I did think of this but, again , does appear to have any work done recently.
3. with the radiator cap off the radiator does seem to have a regular small air bubble come up. Could be the problem. Maybe blown head gasket or cracked head? I think this is the key.
4.Not sure of water loss while driving a bit hard to see from the drivers seat. May have to get the misses to hang on the front as I go for a drive!!
Also it gets hot idling, cruising or sitting in traffic.
5. fan seems fine. Blowing heaps of aironto the motor.

Lastly, it should have the reverse water pump on it (forgot to check actual direction when I have off on the weekend). Easiest way to tell which one it needs is - if it has the serpentine type fan belt and the BACK of the belt drives the fan pulley , you need the reverse watewr pump. I dont think you can physically fit the wrong one - timing covers different too?
#4 ???????????? loss of coolant can be check with a pressure test . the system is put under pressure -- while parked .. best way to make things go bad ,is start off with a incomplete filled cooling system
 

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Discussion Starter #13
Hi All,
Took a punt on the weekend and removed the heads - sure enough - A blow head gasket. I t wasnt so bad removing all the EFI crap (just a few extra hours!) Dropped the heads off, this morning, at my trusty engine reco shop and picked them up on the way home. Hows that for good service!!! Now the reinstall begins.......
 

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I'm having odd problems with mine as well. I pulled the T-stat out and the car with the electric fan on sits right at 190. New standard rotational pump with V belt, Stock radiator, Electric fan. It doesnt have a shroud for the whole radiator, which could be my issue. No T-stat, yet it sits there and idles with plenty of cross flow in the radiator. It's either the Heater hoses have some serious bubbles, or my fan sucks. I know for a fact the head gaskets aren't on wrong. Little odd
 

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Discussion Starter #16
Another update! I reinstalled the reconditioned heads on the weekend - ran into a few problems on the way but sorted them out. I went for the first real long run tod and the B#%&%y thing is still overheating!!! Now I'm really stumped. I triple checked everything along the way and cant find the problem.
I'm now starting to think of some sort of water blockage? Maybe these edelbrock performer RPM heads dont suit late EFI windsors??? Or maybe over-bored cylinders?? (there was no mark on the top of the pistons?)
ANYONE got ANY ideas???!! I'm stuck!

Before you ask - new radiator and cap, new thermostat (tested it too), reconditioned heads, new thermostat housing, checked water pump, head gaskets on the correct way,viscous hub fan draws heaps of air, no coolant leaks, temp gauge correct

What am I missing here???
 

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Discussion Starter #18
I dont really know what else I can tell you?? the temp gauge on the truck works fine. I can tell you the symptoms did not change today. I drove the truck , the temp gauge steadily increased until it was just before hot. It only stopped going up because I had made it home from work. Felt the engine it was definately far too hot. I do know the feel of a normal running motor. Everything was real hot - motor radiator ,top and bottom hose.

Just spoke to a good mechanic friend of mine and ran through in great detail everything that has happened so far. His only comment was I had done every thing right and maybe check if the heads are actually compatible with that block (maybe early carby heads on EFI-are they different??)

Also thinking the truck has done only 30,000miles in the last ten years, and I think very little maintenance in that time, could it be some sort of water/corrosion blockage in the block??

Surely these trucks can run for more than 20 minutes without heating?!
 

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Discussion Starter #19
Sorry only had the trucks temp gauge on my tonight (no seperate numerical gauge) so I cant give you degrees.

Any help with my little detail would be great - even a direction to start looking.
 

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I can understand that everything feels hot but you MUST get a temp gauge on the radiator and the engine in different positions to tell you the true temp of the engine!

That gauge COULD be faulty no matter what you feel in the engine bay...

Get a digital laser temp gauge, spend the $35 bucks on it. Besides being useful it's FUN to play with :)
 
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