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Posted on Jan 02, 2017
Did you put a new cap on the radiator? Small as it seems, if it does not provide an adequate seal on the radiator, than the system does not get pressurized, thus keeping the boiling point around 212 deg. your engine gets way hotter than than normally. When sealed right, the pressurized system raises the boiling point to close to 300. thats how is works. If thats not it,(assuming it is the last thing replaced) than you might have either a cracked head/ head gasket/ valve guides, cooling ports, basic large dollar items. Lets hope for your sake the problem is still in the cooling system, before you look at the motor. If you take out the sparkplugs, you'll be able to tell real quick, rusty, burnt whitish-orange looking condition. Good luck
Posted on Aug 15, 2008
SOURCE: 94 jeep wrangler overheating
Have the cooling system pressure tested. If it holds pressure, that's a good thing. If it doesn't hold pressure, you may have a leaking head gasket. What may be happening is the crack in the head gasket could be blowing hot air into the cooling system causing it to overheat.
Posted on Sep 27, 2008
SOURCE: car runs hot
CHECK YOUR RELAY IN YOUR FUSE BOX UNDER THE HOOD ON THE DRIVERS SIDE INNER FENDER. THE A/C AND THE HEATER RELAY ARE SAME. CHECK AND SEE IF THE A/C REALY WORKS BY TURNING ON YOUR A/C SWITCH. THE ELECTRIC FAN SHOULD START RIGHT AWAY. OTHERWISE YOU HAVE TO WAIT TILL THE ENGINE ACHEIVES OPERATING TEMP TO KICK THE FAN ON. IF ONE DON'T WORK AND OTHER OTHER DOES... SWITCH THE RELAY AND SEE IF IT WORKS. BEEN THERE AND DONE THAT. $9.00 FOR A NEW RELAY AT CHECKER AUTO PARTS.
Posted on Feb 14, 2009
SOURCE: OIL IN ANTIFREEZE
if this is dexcool antifreeze and it has never been flushed after time it will gum up and turn brown if this is the case have your coolant system power flushed I HAVE BEEN DOING THIS WORK FOR MANY YEARS AND HAVE YET TO SEE A 3.8 MOTOR HAVE A CRACKED BLOCK!
Posted on Mar 06, 2009
SOURCE: 99 jeep cherokee problem w/ heat
It could be a flap but more likely you have a air trapped in the heater core or the hoses connecting the heater core when refilled the system after your repair.
Loosen the supply hose that go to the heater core at the highest point and run engine until coolant comes out.
Posted on Jan 05, 2010
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