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Old 05-13-2010, 01:30 PM
firefighter4co21 firefighter4co21 is offline
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Default 1999 ford ranger coolant troubles

I have a 1999 Ford Ranger with a 3.0 Flex fuel engine. I runs fine but blows antifreeze out of the overfill tank. Also the temp. guage seems to move a lot and very fast. The antifreeze is rusty brown. I have flushed it out and put a new thermostat in it. Is it a blown head gasket or is there something else I can try.
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Old 05-13-2010, 01:42 PM
DieHard4rd DieHard4rd is offline
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Default Re: 1999 ford ranger coolant troubles

Replace the radiator cap. My guess is it's not holding the correct pressure.
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Old 05-13-2010, 02:46 PM
FireRanger FireRanger is offline
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Default Re: 1999 ford ranger coolant troubles

It is one of two things.

(1) Radiator cap is shot. They are designed to hold back about 15psi. If there is more than 15PSI in the cooling system, the engine is overheating and the cap will release and vent into the reservoir tank (think PRV on propane tank car, hopefully without the BLEVE which I did have happen once on my truck!)

(2) Head gasket is blown or the heads are warped. Pressure from the cylinders on the compression stroke is pushing into the cooling passages and over pressurizing the cooling system. Too much pressure opens the radiator cap vent and vents it into the reservoir tank.

#1 is cheap and easy at any auto part store. #2, you're screwed.
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Old 05-13-2010, 06:31 PM
firefighter4co21 firefighter4co21 is offline
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Default Re: 1999 ford ranger coolant troubles

I am hoping for the first solution. I am prepared for the head gasket. It does not have an original radiator cap so do I need a original cap or just get another one from a parts store?
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Old 05-13-2010, 07:28 PM
FireRanger FireRanger is offline
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Default Re: 1999 ford ranger coolant troubles

They're pretty much the same. They'll give you the right one. Hopefully no bleves
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How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
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Old 05-13-2010, 07:34 PM
DieHard4rd DieHard4rd is offline
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Default Re: 1999 ford ranger coolant troubles

Just get a new one either from a parts store or from Ford.
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Old 05-14-2010, 08:34 PM
firefighter4co21 firefighter4co21 is offline
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Default Re: 1999 ford ranger coolant troubles

I ran a compression test tonight. Does anyone know what the compression should run in a 3.0. If it is a head gasket shouldn't the compression be low or non existant on one cylinder? The compression ran from 95 to 120 on any cylinder. Thanks for any ideas.
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Old 01-03-2011, 02:13 PM
inad inad is offline
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Default Re: 1999 ford ranger coolant troubles

HEY GUYS When it rains it pours. i think i have a cracked head or 2 any thing i can replace it with that dont crack?
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