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Explorer overheating and boiling in reservoir

Clay44

New Member
Joined
August 26, 2006
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City, State
Thunder Bay On.
Year, Model & Trim Level
91 Explorer
Please can any one help me my coolant is boiling in the reservoir and the truck over heats to the L in normal thanks
 
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Rick

Pumpkin Pilot
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Elite Explorer
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February 8, 1999
Messages
33,466
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City, State
Wayoutin, Aridzona
Year, Model & Trim Level
'93 XL Pumpkin Edition
Callsign
AB7FH
Check to see if your system holds pressure. If there are any leaks or if you have a bad radiator cap the system can't pressurize and that lowers your boiling point.

I had a leak in the side of my radiator where the plastic tank meets the core. It wasn't even enough of a leak to drip on the ground, it was just seeping out. Anyway, replacing my radiator fixed me up.
 
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Rick

Pumpkin Pilot
Staff member
Admin
Elite Explorer
Joined
February 8, 1999
Messages
33,466
Reaction score
1,798
City, State
Wayoutin, Aridzona
Year, Model & Trim Level
'93 XL Pumpkin Edition
Callsign
AB7FH
I almost forgot. Welcome to the site:chug:
 
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Clay44

New Member
Joined
August 26, 2006
Messages
3
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City, State
Thunder Bay On.
Year, Model & Trim Level
91 Explorer
Thanks for the help I'll try that
 
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ma96782

Explorer Addict
Joined
January 21, 2006
Messages
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City, State
Vancouver, WA
Year, Model & Trim Level
'94 XLT, 4dr
My STOCK answer on over heating problems: (beside changing a radiator or water pump)

If you got the tools or access to the kit........pressure check the system.
___________________________________

T-stats can be checked w/ a thermometer and a pot of hot water………or just replace them……….they aren’t that expensive.
____________________________________

While running and with the engine off, make a visual check of the hoses for a hole, check for leaks at the connections. If it passed the pressure test, you should be OK. But, still check for a, "too soft" hose, which may collapse.
_____________________________________

Replace radiator cap........IF, you can't remember when it was last done........or if it's been more than a couple years since it was last changed. If it passed the pressure test, you should be OK.
_____________________________________

Time for new anti-freeze………don’t forget to mix it right.
_____________________________________

Fan Clutch...............when cold (engine off) try spinning the fan....it should spin freely or with very little resistance. If it won't spin.....replace.

When hot (engine off) try spinning the fan........in some cases it will feel like it's, "locked up," or it will be like there is syrup/glue holding it back. Tougher to spin, than when it was cold. If so, It's OK. If, it spins like a top.....replace.
_____________________________________

The below elec. tests are the, "cheap test methods"........there are more sophisticated tests with values, that can be run.

Test for the dash thermo gauge................disconnect the wire from the temp sender unit.........KOEO...........ground that wire.........it will peg the gauge on the hot side............disconnect from ground and it will return.

Sender unit.........if you suspect it..........replace, replacement is cheap.

Aloha, Mark
 
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