cooling problem on my 94 chevy 1500 4.3 v6

Asked by Jan 01, 2017 at 07:50 AM about the 1994 Chevrolet C/K 1500

Question type: Maintenance & Repair

I have a 94 Chevy 1500 4.3 v6 that i purchased a few months ago that i
was told needed a new thermostat.  I replaced the thermostat and flushed
the radiator and noticed temp gauge didnt work and found and replaced
temp sensor connector that was broke and it ran fine locally and around
town( round 10 /15 miles )twice a day.there was no water in oil but the
coolant in the radiator was starting to slowely look like chocolate milk .Then i
started hearing bubbling sounds coming from dash or heater core ,but there
was no steam from radiator and temp gauge was normal,the heater never
worked since i bought it.flushed system and changed oil,but slowely my
radiator coolant was looking like chocolate milk,and my oil level stayed the
same but my transmission fluid was real low,i figured my problem was my
radiator letting trans fluid mix with my coolant so i replaced old radiator with
new one.Truck still had bubbling sound ,no heater ,temp gauge normal,all
fluid levels good exept for coolant in radiator ,i would have to add coolant or
water every other day but there was no more of it looking like chocolate
milk,it started smoking at red lights and stop signs while the truck was in
gear and sometimes when its first crunk and there was a sweet smell to
it,and it was whitish in color,few days later noticed small amount of water
running on top of exhaust,Traced it the best i could and found a small leak
in heater hose coupling and replaced it(after breaking it off in the intake and
buying coupler remover tool to remove it)Few days later ,still smokes a lil
and has a sweet smell or coolant but now temp hand a little above normal
and now there was a pin hole in radiator hose,,replaced it and still same
bubbling sound and slowly temp gauge getting more and more above
normal,a friend convinced me that since there was no water in my
floorboard from a bad heater core that more than likely i had a blown head
gasket .picked up head gasket repair seal and run it through my block then
flushed whole system again,Ran great for about a month or so,No smoking
or barely visable ,bubbling sound heard every now and then,then i started
losing coolant again,Found it leaking from waterpump or close to it and
replaced water pump along with intake manifold gasket just to be
sure,started the truck and it ran idling for about 5 or 10 mins then water
started pouring out from back of the motor from what i could see,,so now im
thinking plug freeze,or ??.does anyone know why i keep getting a different
leak after fixing one ?will freeze plugs fix my problem?could it be head
gaskets,?could freeze plugs be the reason my heater dont work?what else
could be my problem and any advice or tech support is greatly appreciated   

2 Answers

76,335

Ok here, if you smell that sweet smell threw the tail pipe, then you have a bad head gasket. What you could do to help verify would be to do a compression test on the cylinders, checking for low compression. Also look at the plugs, you'd find one or two super clean. I have to ask on this one, when refilling the coolant when you have had it drained, have you burped the system from air pockets? Run the motor with the radiator cap off, heater setting on hot until the thermostat opens up? If so you just may have a plugged heater core. The leak if it is coming from the freeze plug will not help the heating issue, but when fixed will keep the coolant in.

2 of 2 people found this helpful.
72,495

You can, with the engine cold, pressurize the cooling system using a cooling system pressure tester. Start the engine. If the needle on the pressure tester's gauge bounces the head gasket is blown. Flushing out a 22 year old cooling system can really open up a can of worms. Especially if you used a chemical cleaner! Any weak spots in the cooling system can and often do open up and you get more leaks than you started out with. Adding a stop leak product can create a different set of problems by clogging things up. The gurgling in the heater core is definitely air in the cooling system. HTH. -Jim

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