My truck is blowing coolant out of the overview tank and has no heat. Could this be a rad cap issue or head gasket?

30

Asked by Feb 15, 2015 at 03:57 PM about the 1988 Ford F-150 XLT Extended Cab LB

Question type: Maintenance & Repair

88 F150 w/ 5.0, New radiator

17 Answers

Yes and Yes. It could be a simple as a weak radiator cap, allowing pressure release too soon. Then if it is a head gasket, the same thing will happen if it is blown out between combustion chamber and water jacket, it will blow pressure in to cooling system. But then think water pump, or thermostat stuck closed... if it's not circulating = no heat to heater core and overheating engine

3 of 3 people found this helpful.
30

It is circulating, I pulled the top hose and it is flowing through the motor.

1 of 1 people found this helpful.

Ok, then back to your first thoughts. Water pump/thermostat was speculation. Try a new cap, not an expensive try, also with engine running and rad cap off, hopefully you will not see bubbles, because that is an indication ..not proof, but evidence of head gasket

3 of 3 people found this helpful.
30

When I start refilling the radiator they are some bubbles initially but they go away as I add coolant. I can let the truck run after I top off the coolant and the level will go down slowly the longer the truck idles.

1 of 1 people found this helpful.

To state the obvious, it's gotta be going somewhere... that combined with it blowing out cap if under pressure, leaning more and more to head gasket..but I need to be careful and not jump to that either. You know what my next move would be? Rhetorical sorry..get a pressure tester, and with engine cold pump air in and see if you can tell anything..before ripping head(s) off.

1 of 1 people found this helpful.

And make sure your engine oil looks good..not like a chocolate shake and overfull, or white emulsion on dipstick or filler cap

30

I'll try the pressure test, hadn't thought about that. Oil looks good, needs to be changed but was going to wait until I corrected the coolant issue to do it.

Good luck....don't know what else to say

1 of 1 people found this helpful.
20,415

I second that radiator cap

30

Tried radiator cap and now I'm getting small bubbles in the coolant if it's idling without the cap. I'm thinking blown head gasket now.

1 of 1 people found this helpful.

What happen's if i put anti freeze with soap in my cooling system?

92,115

Don't use soap, use leak detection dye. You will need a black light to see it though.

30

im leaking coolant out of overview tank n i got heat n i replaced my radiater thermostat n water pump..and radiator cap so need help with problem. thought i had to much coolant in it for warm days

3 of 3 people found this helpful.

I have a 97 f150 with a v6 keep losing coolant out the top of the radiator it has a new water pump that's the only spot that showed a leak

20,415

Take your radiator cap off (when cold), start your engine and rev it. Does coolant come out of your radiator when you do? If so you have a blow head.

1 of 1 people found this helpful.

I have my 99 f-150 4×4 with the 5.4 when the cold weather over heats did over flow cap the thermostat 3 times and then out of blue back to square one. Even bought k&w headfix an gasket repair an work for 3 months. I spent 125.00 in antifreeze.now 150 in bars leak head sealer. Looking for a motor or buy create motor

Love my trucks got a 1980 f100 ranger exploer an 99 f150 4x4 but hate fords 5.4 motors any help or replys

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