Question about 1999 Jeep Wrangler

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Overheating radiator very hot and upper hose very hot, but lower hose is cold. t-stat was changed a while ago as well as water pump. Could any of the changed parts be deffective

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  • Master
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It's possible that the thermostat is defective. See my "Tip" on checking a thermostat.

Posted on May 08, 2010

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  • Jeep Master
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Yes they could. Some thermostats are bad out of the box and if you bought a rebuilt water pump it may never have been anything but cleaned.

Posted on May 08, 2010

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Hey guys and gals, I am a technician at a california shop and we got a 2001 Saturn L200 2.2L in the other day. Vehicle came in overheating. The upper radiator hose was hot to touch up at the engine but not...


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Hi,i,m a guest here .i have overheating problem with my toyota camery 92 v6...i got that my fan isn't working well , i changed it & the fan got better,,but it's not fixed yet & still i have...


How about the thermostat?

If your getting heat out the vents, the coolant is full, the upper hose is hot and the lower hose is cold that the t'stat is not opening.

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1995 toyota avalon, overheating,just changed s/belt compressor stop working, now it runs hot. is this now a prblm with water pump or first thermostat?


I do not see a good connection between the serpentine belt and the engine overheating suddenly.

Perhaps you have a lot of burnt belt rubber on the water pump pulley?

Is the upper radiator hose hot? If so the stat is opening. If you start the car cold with the radiator cap off you can watch for coolant starting to flow and make sure the stat works...if the flow is low you have either a blocked stat or poor belt grip at the waterpump. Have you flushed the radiator recently? After 15+ years your car could be ready for a cleaning.

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Which way does the waterpump turn on a 1985 Ford LTD 302?


The feature than can determine the way the pump turns would be whether they were driven by the smooth side of a serpentine belt on the one had, vs. the grooved side of a serpentine belt or a V belt on the other hand.

It would really be a good idea to get a numeric reading on the engine temperature...

Of course, the number one issue is the thermostat. If it is too high of a range, or is not opening properly, the 4-core radiator will never be called on.

Next is the possibility that steam/vapor is collecting around the t-stat. I had a big problem with that in an Aries K. Once it got hot enough to open the t-stat a few times the temperature settled down.

If the fan is not doing its job sufficiently you will get overheating at stop lights and in crawling traffic, but cooling that is fine above maybe 15 or 20 MPH.

If the bottom radiator hose has failed, it can collapse due to the suction of the water pump. For the whole length of that hose you should not be able to flatten the hose by hand. It should have a spiral of wire, a "spring," inside it that prevents that. If that wire has corroded, and isn't doing its job you can get compromised flow.

When the engine is cold, start it up. Before long, the heater hose that comes out neat the t-stat should start to warm up, while the upper radiator hose stays cold. The closed t-stat forces circulation through the heater system. This causes flow over the hot surfaces, and carries the heat from the area of the cylinders to the area of the t-stat. without that, the water's heat would take 10's of minuted to get to the t-stat.

Next, when the heater hoses get too hot to touch comfortably, but before the engine overheats, the upper radiator hose should start to warm up. The t-stat will start to open, and a little hot water will sneak out of the engine, heating the hose a little. That will introduce a little cold water from the radiator into the water pump, where it will get quickly mixed with the water circulating through the heater system, closing the t-stat pretty quickly. So the initial warming of the upper radiator hose will be pretty slow.

If it overheats before the upper hose gets too hot to touch, you have a t-stat problem. Either the t-stat is failing to do its job, or it is not getting the heat signal it needs to operate properly.

If the heater system is clogged or plumbed wrong, it will not allow the requisite circulation.

I hope this gets you on the road to fixing your overheating problem. A 302 with a mondo radiator as you describe should have no overheating troubles, even in the desert!

Jun 19, 2010 | 1985 Ford Crown Victoria

1 Answer

My radiator on my 1994 toyota hilux sulf is over heating just sarted in last few days. Temperature gauge fluctuates when i turn air conditioning on.how do i fix this


First check if you have any leaks in the cooling system , then check if level is correct(radiator and expansion tank , check level when car is cold , never open radiator when it's hot).
Then verify operation of radiator fan , if it's electrical fan it should comes on when temp. goes over normal,
if it's a clutch fan- it should pick up a speed and be more loud. If fan is not on and engine is starting overheating , check upper and lower radiator hoses.
If upper hose hot and lower hose cold or warm then you might have stuck close or prtially closed thermostat , difference between lower and upper hoses when t/stat works ok is about 10-15 degrees,
not really noticeable for hand.So if you don't feel a lot of difference between hoses temp. , and fan is not on , check fan or fan clutch itself.
If lower hose cold , replace thermostat and purge system.
If everything above is working properly , and it's still overheating , you may have bad water pump or head gasket.

Jun 18, 2010 | 1986 Toyota Pickup 4WD

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