Question about 1994 Jeep Wrangler

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94 jeep wrangler overheating

I HAVE A 94 WRANGLER THAT OVER HEATS WHEN IT GETS HOT OUT.I CHANGED THE RAD. WATER PUMP,THERMOSTAT,HEATER CORE, FAN CLUTCH, HOSES, HAD THE SYSTEM FLUSHED, RUN A 60-40 MIX,AND RUN FULL SYNTH.OIL......HELP

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  • cbrodziak Sep 28, 2008

    Thanks for the info will try it and get back to you.

    thanks again craig

  • Anonymous Mar 12, 2014

    How long does it take to change a heater core in a 2009 Jeep Wrangler?

  • Anonymous Mar 15, 2014

    94 jeep wrangler 4.0 r&r clutch how to

  • Anonymous Mar 16, 2014

    I own a 2002 Honda Civic LX. My car over heats ONLY when the heat is on?? other then that it runs fine. could it be my heater core needs flushing?

  • Anonymous Mar 23, 2014

    heater hoses get warm but not hot

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  • Master
  • 702 Answers

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

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3 Answers

Why would my jeep overheat with the heater or a on


check the coolant pump is good and the radiator is not blocked both air flow thru the core and coolant flow thru water tubes, you can check for coolant flow thru the rad by feeling the core for any cold spots after running engine til warm then switch. off the radiator should be hot at top and cooler has you feel down with even temp all along any cold spot means the rad is partialy blocked.if the rad is red hot at top and cold at bottom it may be the pump if its got a electric cooling fan check thats working ok, good luck

Sep 25, 2016 | Jeep Cars & Trucks

1 Answer

Jeep wrangler 4 cylinder heat doesn't blow out


hi Lori.
No year stated. so I can NOT be accurate (only generic)
the engine must be hot first.
does the fan blow? if not fix that 2nd.
if it does blow, on high, can you direct air to all vents, defrost, try ReCirc?
first feel the top engine Front radiator hose. see hand fly? off ouch?, that is 180F+ temp. ok RAD is hot. (if not hot the engine thermostat is bad , stuck open) (under hood test this is.... read a book on safety first)
then I feel the 2 heater core hoses. same deal both must be hot.
if not? you have problems. (heater core clogged, etc)
next time post the year, I have a 2008 and know it well.
but they made wranglers from 1986 to now.

the fsm is here.read that. on heat

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

if all that, is Greek, then get it serviced as the operators guide directs you.

some cars old had a water valve., but no year, no joy.

Nov 16, 2014 | Jeep Wrangler Cars & Trucks

1 Answer

Why am i overheating


anon post
no engines option state (no size and cyl. counts)
is the dash toy gauge working right or fibbing.?
i never trust one, i use the nand IR pyro gun for 15 bucks.
the gun can in fact tell you if any RAD tubes are clogged
thermostat not in backwards? and bleed hole up hill?

a bad rad tube will read hot on the feed end and about 50 degrees
less on the other end, if not the tube is clogged. easy huh,
running 50% coolant
no coolant in the engine oil?
no oil in the top of rad neck, or carbon chucks.
signs:?
not getting so hot it pings?
steam out tail pipe end on hot motor and stinks sweet (glycol sweet)?
rad cap works and holds 14psi.? the big rad hoses.when squeezed
will reflect that 14 pound per square inch. super easy test.
no leaks.
no leaks on passengers toes, or to ground or to engine oil pan(milky)
if all that pans out the pump is bad. or belt loose.

one thing not stated.
does it overheat parked and running fast. or both.??????
if only parked the fans are failing.
all engines over heat parked, and in FACT that is the FSM '
test, doing exactly that. you get it warm, then parked
it starts to get hot. then the fans come on,
if not , fix fan(s)
summer answer, not in winter in Alaska.... different answers there.

are the air paths from the grill to the back side of RAD
clean not all parked in dirt bugs and what not?
if the fan cant suck, the RAD will overheat. for sures.




Sep 05, 2014 | 1999 Jeep Wrangler

1 Answer

98 grand cherokee little heat.heater hoses hot top rad warm bottom is cold collant barely luke warm


While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.

Nov 14, 2013 | 1998 Jeep Grand Cherokee

2 Answers

Changed thermostat and added coolant but 1997


could be waterpump?
i was going to say rad fan,but if so heater would be hot.
lack of coolant will make heater core to blow cold,if engine heats up with full coolant,usually means poor or no circulation.
water pump?
run engine with full coolant,at operating temp.with rad cap off and look in rad cap hole and see if there is movement of water inside rad.
[rad fan will not come on if water is not circulating through rad water pump?]

Dec 20, 2009 | 1997 Chrysler Cirrus

2 Answers

1994 Honda Civic LX\overheating within 2 mile drive


Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.

Aug 23, 2009 | 1998 Honda Civic

1 Answer

The heat in my 1992 Jeep Wangler is not working.


The only reason it won't blow hot air is because the water is not getting to the heater core. Check to see if you have a heater control valve in one of the two lines to the heater core. If so check to be sure that is is opening and closing. If it won't open then you get no water flow in to the heater core.

Feb 04, 2009 | 1998 Ford F150 Regular Cab

1 Answer

1999 jeep wrangler 4.0 liter sport heater problem #2


Make 100% sure before you go and spend more $$$ that (1) you have good coolant flow through the heater core; get engine to operating temp,then with heater fan on high and temp control on full hot carefully grasp heater in and out hoses(i use a in-fared heat gun to diagnose). They should be very close to same temp, if not, core is plugged or if equipped with a flow control valve, its not opening or there is an air lock in system.(2) If coolant flow is good, suspect the hot/cold blend door being stuck in cold position assuming you have good air flow. Its very rare for engine cooling to be ok and heater core coolant flow be bad , caused by a failed water pump! Hope this helps! Please rate me,Thanks!

Jan 18, 2009 | 1999 Jeep Wrangler

1 Answer

1992 Jeep Wrangler heater not blowing hot air


How often has the coolant been changed? My only guess is that it hasn't and the hoses and the heater core are plugged up with goo and a flush is needed

Dec 05, 2008 | 1992 Jeep Wrangler

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