1994 ford ranger 4.0 engine loosing coolant under pressure.?

Question

I have 1994 ford ranger with 4.0 engine the engine only has 88,000 When idling it is fine but after driving for about 15 minutes I am loosing coolant. I pressure checked the radiator and nothing is leaking. I checked for oil on dip stick nothing no milky white substance. I checked exhaust pipe and is clean any other suggestions where coolant can be going

Answer 1

1994 Ford Ranger Radiator

Answer 2

I'm assuming u checked it running under pressure to ascertain water pump, weep hole and no hoses r leaking.IF u are overfilling the reservoir it will pour out when fluid expansion occurs. The line on the reservoir is a COLD liquid-radiator-engine fill line,be sure and check pressure cap also.

Answer 3

If you have done a *cooling system pressure test, the cooling system should hold 15 pounds pressure for 12 hours. If there are no external leaks you do have an internal one. A cylinder leak down test will show you exactly where the leak is.

Answer 4

Ask someone to follow you and watch the exhaust pipe. If you see white smoke from the exhaust you might have a damaged head gasket. Probably an internal failure.

Answer 5

if there is no antifreeze in the oil and no white smoke coming out the tailpipe then you can rule out the head and intake gasket ! this is just a guess but maybe air is inside the cooling system ! try flushing out the whole cooling system and when you fill it back up bleed the air out and see if it stays full !