Topic: running hot after changeing heater hose

[countrymusic1993]

The other day I opened the radiator and the cap had brown crap piled on it and it was low on coolant after cleaning the cap and overflow I filled it with coolant. There was also a small hole in the hose that goes from heater core to thermostat housing I replaced that with a slightly narrower hose and now the temp gauge is running from 210 to 260 it happens at high and low speeds. I back flushed the system and replaced the thermostat along with the radiator cap. I was thinking it could be a bad sensor or the water pump but I don't know how to check them without pulling everything apart. what do you guys think it could be.

[sharpxmen]

The other day I opened the radiator and the cap had brown crap piled on it and it was low on coolant after cleaning the cap and overflow I filled it with coolant. There was also a small hole in the hose that goes from heater core to thermostat housing I replaced that with a slightly narrower hose and now the temp gauge is running from 210 to 260 it happens at high and low speeds. I back flushed the system and replaced the thermostat along with the radiator cap. I was thinking it could be a bad sensor or the water pump but I don't know how to check them without pulling everything apart. what do you guys think it could be.

did you replace the radiator cap or just cleaning it? was the brown stuff hard deposits or more like grease? if the latter how's your oil looking, any foaming on the oil fill cap?

[countrymusic1993]

I replaced the cap the brown stuff  was like grease, and i pulled the water pump today and it looks like new.

[grumpygy]

What does your oil look like.

[sharpxmen]

if it was grease like would point towards the cyl head gasket, check the oil.

[Jeffy]

So the temp was fine until you changed out the hose?  The 'grease' is probably from being low on coolant allowing water vapor to condense under the cap since that's the highest point.

What you might want to do is pull the temp. sender and test it to see if it's accurate.  Then check the gauge.

Did you replace the thermostat before or after this started happening?  Was the old thermostat working?  Did you test the new one?  If you bought a cheap one, then it could be bad as well.

[grumpygy]

Did you test the new one?  If you bought a cheap one, then it could be bad as well.

Also was it the right temp.  Will fully agree on the cheap one had that happen to me before.

[countrymusic1993]

the Oil looked fine and i rebuilt the head last year,before i changed the hose it was running at like 210 i replace the thermostat after everything and it is not a cheep one. how could i test the temp. sender and the gauge.

[grumpygy]

Just got to ask what type of jeep.

[countrymusic1993]

95 wrangler 2.5l

[grumpygy]

Sure you got the right thermostat.  Mine stays at 180 all day long never over.


  Also when it cools off pull the cap and fire it up, see what it does, do you notice movement in the fluid(only Movement after the Thermostat opens).  Do you notice Bubbles.  At round 180-190 did you see the motion of the fluid pick up.

Just checked you could get a 195,180 or a 160 thermostat.  I use the 180 cause here in the winter 180 works the best.

[sharpxmen]

stock is 195.

160 is too low.

[grumpygy]

stock is 195.

160 is too low.

Agree .  I use the 180 cause in the winter if I use a 195 it never reaches that.  At least at 180 it stays at a steady 180.

[Jeffy]

the Oil looked fine and i rebuilt the head last year,before i changed the hose it was running at like 210 i replace the thermostat after everything and it is not a cheep one. how could i test the temp. sender and the gauge.

Cheap one being a Stant or anything other then a Robertshaw/MrGasket $10 thermostat.

You can put the thermostat in a pot and boil the water.  When the temp reaches the designated temp it should open.  You can also run the engine and take the temp with the radiator cap off and watch for the thermostat to open.  It's easy to tell since the radiator will start to overflow as the temps rise then it should drop quickly when the thermostat opens.

Also, you said you replaced the water pump.  Did did you get a reverse flow or a standard?

[countrymusic1993]

I have the 195 in there now,  and no i did not see any movement in the radiator I though it could be the water pump so i pulled the water pump off but it look like new to me. I never replaced the water pump just pulled it off all i replaced was the thermostat.