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94 b4000 overheat update #5346517 02/10/20 05:57 PM
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HyundaiAbuser Offline OP
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So my 94 b4000 is still overheating after replacing the water pump. The main two responses to the last post were air in system and possibly headgasket. I purchased the headgasket combustion leak test kit and it came negative and also a spill proof funnel and tried to burp the system. However when letting the car run after heating up the coolant would come to the top of the funnel. It would rise and fall with an upward trend toward rising. Upon shutting off the vehicle it would immediately drop back to within the radiator. Would this be indicative of a clog in the system somewhere or am i just chasing ghosts? no coolant was added and the coolant level did not change at all. I am leaning toward the water pump just being bum.


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: 94 b4000 overheat update [Re: HyundaiAbuser] #5346523 02/10/20 06:01 PM
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ad244 Offline
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Plugged Radiator?

Re: 94 b4000 overheat update [Re: ad244] #5346527 02/10/20 06:04 PM
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Originally Posted by ad244
Plugged Radiator?

Itd be a shame, the radiator is less than two years old and i just took it out and flushed through every coolant opening with a hose.


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: 94 b4000 overheat update [Re: HyundaiAbuser] #5346533 02/10/20 06:11 PM
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If it's hot, does the rad fan blow nice hot air rearward? It should. If it doesn't it's bad water flow, fan clutch, or clogged rad.

Re: 94 b4000 overheat update [Re: eljefino] #5346538 02/10/20 06:15 PM
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Originally Posted by eljefino
If it's hot, does the rad fan blow nice hot air rearward? It should. If it doesn't it's bad water flow, fan clutch, or clogged rad.

ill have to check tomorrow, couldnt tell off of memory. I forgot to mention i ran a flush through the heater core hoses with the drain on the radiator open and the drain itsself got plugged up. The radiator then filled to the top and i had to pull the lower hose. Then hooked hose up to the drain port with the lower hose off and flushed out that way. I havn't seen any tangible contaminants but it would appear as though they're there.

Last edited by HyundaiAbuser; 02/10/20 06:16 PM.

03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: 94 b4000 overheat update [Re: HyundaiAbuser] #5346547 02/10/20 06:25 PM
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Is the overflow hose from the radiator to the reservoir clear? And the fitting at the top of the reservoir where the hose connects?

Since the radiator drain plugged up, I'd be very suspicious of that. I flushed everything I could out of the radiator in my 1994 Ranger when I got it, and still had to put a new one in to get the temperature to not creep towards high. I know you said it's only a couple years old, but if there's enough junk to stop up the drain, there's probably enough junk to clog a tube. I wonder if flushing might have shifted something around, but didn't clear it out.

I kind of doubt trapped air. I've never done very much to bleed the cooling systems on my 4.0s...a good long drive always seems to do it.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 236K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 202K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 254K miles
Re: 94 b4000 overheat update [Re: 01rangerxl] #5346555 02/10/20 06:31 PM
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Originally Posted by 01rangerxl
Is the overflow hose from the radiator to the reservoir clear? And the fitting at the top of the reservoir where the hose connects?

Since the radiator drain plugged up, I'd be very suspicious of that. I flushed everything I could out of the radiator in my 1994 Ranger when I got it, and still had to put a new one in to get the temperature to not creep towards high. I know you said it's only a couple years old, but if there's enough junk to stop up the drain, there's probably enough junk to clog a tube. I wonder if flushing might have shifted something around, but didn't clear it out.

I kind of doubt trapped air. I've never done very much to bleed the cooling systems on my 4.0s...a good long drive always seems to do it.

I have almost been waiting for some sort of input from you after seeing your tag throughout random forums lol. But that sounds like a good idea that I will have to try tomorrow. When i ran water through the system it appeared to have an orange/reddish tint to it like there was some sort of contaminants or rust in there but nothing really tangible. I know that air can get through the overflow tube but im not sure if coolant flows freely.


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: 94 b4000 overheat update [Re: HyundaiAbuser] #5346578 02/10/20 06:50 PM
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Maybe fan clutch?

Re: 94 b4000 overheat update [Re: ad244] #5346586 02/10/20 07:01 PM
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HyundaiAbuser Offline OP
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Originally Posted by ad244
Maybe fan clutch?

I've used two separate fan clutches and it occurs at all speeds.


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: 94 b4000 overheat update [Re: HyundaiAbuser] #5346626 02/10/20 07:32 PM
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Rand Offline
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With those symptoms and facts I'd probably be looking at the radiator.

Although I've never backflushed a heater core into a radiator.

Was any stopleak ever used?


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: 94 b4000 overheat update [Re: Rand] #5346638 02/10/20 07:41 PM
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Originally Posted by Rand
With those symptoms and facts I'd probably be looking at the radiator.

Although I've never backflushed a heater core into a radiator.

Was any stopleak ever used?

There was at one point a good while back. I didnt flush the heater core back i just used the hoses to flush the block out hopefully.


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
Re: 94 b4000 overheat update [Re: HyundaiAbuser] #5346679 02/10/20 08:30 PM
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Remove radiator turn it upside down and back-flush. It should be possible to send the full flow of a garden hose into one end and have it almost instantly come out the other. If not, the core is clogged. As @Rand said, always best to disconnect the hoses and flush each part separately so you're not just moving dirt around.

Re: 94 b4000 overheat update [Re: HyundaiAbuser] #5347336 02/11/20 03:59 PM
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andyd Offline
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what does the coolant look like? Also,wasn't the OHV 4.0 prone to intake manifold gasket leaks?


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: 94 b4000 overheat update [Re: andyd] #5347566 02/11/20 07:59 PM
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Originally Posted by andyd
what does the coolant look like? Also,wasn't the OHV 4.0 prone to intake manifold gasket leaks?

The coolant at this point is just water it has been flushed and washed through repeatedly. But beforehand held green color well and when running through the block water comes out an orangish tint.


03 Hyundai Tiburon:
Castrol Edge 0w40
Redline MT90
94 Mazda B4000
Supertech 5w30 Full Synthetic
Valvoline Dex/Merc
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