Temp gauge in heater hose, will this work ?
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I have a 89 jeep cherokee and this home made fitting was installed on the heater hose for a mech. gauge but the gauge line was broken when I bought it. I would like to use a elec. sending unit gauge, never had much luck with the small dia. mech. gauge sending units ,seem to last a year or so. If I put a adapter to run a elec. gauge in this home made fitting will I get a proper reading with the sending unit being too far from the main stream of the coolant? I also believe he has it on the wrong heater hose, would it still tell me the temp? I still want to keep the idiot line gauge and don,t want to play with the stock fitting
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Re: Temp gauge in heater hose, will this work ?
I wouldn't think so..I would think it wouldnt work if the heat was "off"...if the heater shutoff valve stops flow thru the heater core the line is gonna be cold
I wouldnt put it there anyway and cant imagine why someone did.. It needs to be in the head or block... |
Re: Temp gauge in heater hose, will this work ?
If the heater system has a on/off valve for water flow, then no, that won't work.
If the water flows full time, then maybe. In this case, I would install a T where the hot water exits the manifold/head and put your sender in that. Don't use any extension so the sender is as close to the fresh flow as possible. If you go this route, use one of those infrared/laser temp readers to see how close your new gauge is to what the temp reader shows once everything is full hot. |
Re: Temp gauge in heater hose, will this work ?
Now thats creative. Pretty sure it will give a temp but it wont be correct. I will give the installer A+ for the college try
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Re: Temp gauge in heater hose, will this work ?
It won't be accurate, but it'll be good enough for general monitoring. Just map it out with an infrared gun shot on the thermostat housing to see what your correction factor needs to be.
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Re: Temp gauge in heater hose, will this work ?
Thanks ,winter coming and I just use the jeep for winter,but when It gets well below freezing I put a rad blanket on the front to get better heat in the cab. but would like to know the temp as I don,t like a idiot light. Yes flushed heater core , new thermostat all the normal stuff but not giving me good heat at the below freezing. It,s just a winter truck so no big deal. I,ll wear a warmer jacket, just wanted a gauge.
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Re: Temp gauge in heater hose, will this work ?
Ha-ha! Jeeps are great: overheat in the summer and freeze you to death in the winter :lol:
Is the vacuum shutoff still in place? Has it been converted to open system? You know there is a cherokee forum ;) |
Re: Temp gauge in heater hose, will this work ?
The heater hose will always read lower than engine temp. If the valve is still in the heater circuit it'll read a lot lower.
IIRC the 258 AMC in my 82 Eagle Wagon had the coolant temp sensor screwed into a cast boss in the block about a third to halfway from the oil pan to the head gasket. If it's in the same place on the 4.0L it'll be along the same casting rib as the boss for the block drain. I'd look into replacing the NPT block drain plug with your gauge sender. |
Re: Temp gauge in heater hose, will this work ?
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Re: Temp gauge in heater hose, will this work ?
Yes valve is still in place and is still a closed system. I didn,t know what that was called.
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Re: Temp gauge in heater hose, will this work ?
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IIRC, there are actually two factory heat sensors: one for the gauge and one for the electric fan. I believe the latter is actually in the radiator itself (which is one of the complications of converting closed to open system). Anyway, cherokee no space forum dot com is where I get my information. ;) |
Re: Temp gauge in heater hose, will this work ?
I know is not a jeep forum ,so I better stop. Just wanted to know about temp. gauges and if it would work which universal to most applications. Will check that forum, just need heat below freezing. Thanks gmc 20
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Re: Temp gauge in heater hose, will this work ?
You really want to be measuring temp as close to the outlet to the radiator as possible. That's why you most often see senders located in the intake next to the thermostat.
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