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1990 Ford Bronco overheating problems

Tiny
ZAYDAY05
  • MEMBER
  • 1990 FORD BRONCO
  • V8
  • 4WD
  • AUTOMATIC
  • 240,000 MILES
Over heating problems. I converted it from EFI to carburetor. Brand new intake brand new carburetor. I thought it was the thermostat but it was not. Then installed a new water pump but that did not fix the problem.

Please help!
Thursday, March 30th, 2017 AT 2:43 AM

11 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,467 POSTS
Was it overheating before the conversion? Does the intake manifold have all the same passages and water crossover ports as the EFI unit?

Do both radiator hoses heat up the same or does one get hot and the other stays cool/cold. Have you tried to pressure test the system or run a combustion gas test just to be sure you don't have a bad head gasket?
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Thursday, March 30th, 2017 AT 3:10 AM
Tiny
ZAYDAY05
  • MEMBER
  • 3 POSTS
Only one of my radiator hoses get really hot! It was not running prior to me changing to to carburetor. I did not try pressure testing it.
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Thursday, March 30th, 2017 AT 3:19 AM
Tiny
STEVE W.
  • MECHANIC
  • 13,467 POSTS
If only one gets hot the radiator is blocked. Try flushing it from the bottom hose out the top. Or just replace it.
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Thursday, March 30th, 2017 AT 8:16 AM
Tiny
ZAYDAY05
  • MEMBER
  • 3 POSTS
Okay thank you
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Thursday, March 30th, 2017 AT 9:19 AM
Tiny
SHARTMAN65
  • MEMBER
  • 1 POST
  • 1990 FORD BRONCO
  • V8
  • 4WD
  • AUTOMATIC
  • 11,000 MILES
Engine Cooling problem
1990 Ford Bronco V8 Four Wheel Drive Automatic 110, 00 miles

I just purchased a 1990 Ford Bronco off of a family friends. The guy claims to have kept up with the truch. Shortly after I got it I had issues starting it come to find out that the fuel pump was going and eventually went in it. So far I have replaced the fuel pump, water pump, and done a complete tune up on it. After putting the water pump in I started having over heating problems and now the truck cant run for more than a 25 minute period without overheating and smoking and theres a knocking sound when I accelerate coming from underneath of the car. Also the car has a tendency when I stop to stall out. After I stop and turn the car off the water in the antifreeze tank seems to boil inside. Along with a ton of smoke coming from the inside front area and it looks l ike the engine. What is going on, and what can I do?
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Saturday, April 1st, 2017 AT 4:26 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Double check the water pump if its leaking and doing its job and for a clogged radiator and a bad thermostat-pump/radiator/thermostat okay-try bleeding the cooling sysytem don't work -Get it block and pressure tested.
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Saturday, April 1st, 2017 AT 4:26 PM (Merged)
Tiny
ATKAPARKING
  • MEMBER
  • 64 POSTS
These are really nice trucks, and the mileage is really low, but it sounds like you will need to do some motor work to keep it on the road. The knocking sound is most important--I wouldn't drive it anymore until you have the system pressure tested and checked for bad headgaskets/cracked heads.
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Saturday, April 1st, 2017 AT 4:26 PM (Merged)
Tiny
SURFN959
  • MEMBER
  • 3 POSTS
  • 1990 FORD BRONCO
Engine Cooling problem
1990 Ford Bronco V8 Four Wheel Drive Automatic

Where is the thermastat located in 1990 ford bronco 302?
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Saturday, April 1st, 2017 AT 4:26 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Follow the upper radiator hose back to the engine. It will end at the thermostat housing. THe t-stat is under it/ I believe there are two bolts holding it on.

Let me know if you have other questions.

Joe
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Saturday, April 1st, 2017 AT 4:26 PM (Merged)
Tiny
PORTER90
  • MEMBER
  • 1 POST
  • 1990 FORD BRONCO
Engine Cooling problem
1990 Ford Bronco V8 Four Wheel Drive Automatic

ok my 1990 ford bronco has been running great up too two weeks ago. My heating coil went out and I replaced that as well as my thermastat because it was stuck. However I have began leaking anti-freeze my thermastat housing two days ago. I have yet again taken the housing off cleaned and properly sealed it back on but yet again it is leaking. The leak appears to be coming from around the smaller hose that leads into my water pump. I have checked and tightend all the clamps I possibly could. It seems not to leak awhole lot until I hit the gas. Is it possible that my water pump is going out and causing it to leak from the thermastat from above it? Or do I just possibly have a faulty hose?
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Saturday, April 1st, 2017 AT 4:26 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
When a water pump goes out it gives insufficent flow so that will not cause a leakage. Your hose could be internally cracked or the htermostat gasket itself.

If that hose was hard to get off when you replaced the thermostat then chances are the metals under it was corroded and when hose was pulled off left some low spots. Put some rtv sealant on the housing so when you put hose clamp on it seals better
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Saturday, April 1st, 2017 AT 4:26 PM (Merged)

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