Lower radiator hose doesn't heat up? No overheating though.
#1
Lower radiator hose doesn't heat up? No overheating though.
I just noticed my lower radiator hose isn't heating up, even after a drive on the freeway. The car runs great and doesn't overheat or anything. I just randomly noticed that when I was bleeding the system for a different issue yesterday.
The hose is completely cool(not even warm) untill about 10 inches away from the thermostat but I think it's only warm there because it's touching the hot heater hose.
The top hose is hot, almost too hot to touch.
Is this normal? Or is my thermostat bad?
The hose is completely cool(not even warm) untill about 10 inches away from the thermostat but I think it's only warm there because it's touching the hot heater hose.
The top hose is hot, almost too hot to touch.
Is this normal? Or is my thermostat bad?
#2
Honda-Tech Member
Join Date: Nov 2008
Location: Seattle, WA
Posts: 881
Likes: 0
Received 0 Likes
on
0 Posts
Re: Lower radiator hose doesn't heat up? No overheating though.
It depends what the coolant temp. is. If it isn't getting hot enough to open the thermostat, that's fine. If temp. is above the thermostat temp. rating, it's bad. If you're concerned at all, change it anyway they're cheap.
#3
Re: Lower radiator hose doesn't heat up? No overheating though.
well it's still cold after a freeway drive and then idling for a few minutes I didn't check the exact temp then but when I drive on the freeway my scanner shows 187 or something like that. At idle it's higher probably
#4
Re: Lower radiator hose doesn't heat up? No overheating though.
Post a picture of the normal reading of the temp gauge when the engine is fully warmed up. Is it cold where you live?
#5
Re: Lower radiator hose doesn't heat up? No overheating though.
i have same problem. my rad fan turned on and my lower hose was still cold on lower part just like yours.....i have a oem honda thermostat im going to swap in tomorow.
ill let you know if my lower hose heats up after.
i have no problems with overheating either. but i can see the thermostat is stuck. the upper hose will be pressurized and the lower feels soft.
ill let you know if my lower hose heats up after.
i have no problems with overheating either. but i can see the thermostat is stuck. the upper hose will be pressurized and the lower feels soft.
#6
Re: Lower radiator hose doesn't heat up? No overheating though.
Ok thanks.
I can't take a picture right now because I'm having another problem with my motor right now and don't want to let it idle for that long.
But the temp needle is exactly parallel to the bottom of the gauge, which makes it a little less than halfway. Is that normal or should it be halfway?
I can't take a picture right now because I'm having another problem with my motor right now and don't want to let it idle for that long.
But the temp needle is exactly parallel to the bottom of the gauge, which makes it a little less than halfway. Is that normal or should it be halfway?
#7
Re: Lower radiator hose doesn't heat up? No overheating though.
A typical temp gauge reading at normal engine operating temp is less than halfway, typically about 1/3. If that's what your gauge reads and not higher or unsteady, then I don't see a reason to worry. Our engines normally run a bit on the cool side.
Trending Topics
#9
Re: Lower radiator hose doesn't heat up? No overheating though.
my idle is bouncing and i think i have air in my coolant from my throttle body swap.
#11
Re: Lower radiator hose doesn't heat up? No overheating though.
only way i know how to bleed the system is to let it run with the coolant cap off. but usually before the fan kicks on my car dies from the idle bouncing.
when its cold it idles great. but once it gets warm it tries to drop rpm and just surges. it will do it so bad sometimes it dies if i dont give it gas.
my timing is good, put in a TB with a fitv, new intake, plugs, wires, rotor and cap, and my fan kicks on but the lower hose is still cold.
i am going to swap the t stat and bleed it to see if thats does thr trick. thanks ron. and if you have any thing else it could be lmk
when its cold it idles great. but once it gets warm it tries to drop rpm and just surges. it will do it so bad sometimes it dies if i dont give it gas.
my timing is good, put in a TB with a fitv, new intake, plugs, wires, rotor and cap, and my fan kicks on but the lower hose is still cold.
i am going to swap the t stat and bleed it to see if thats does thr trick. thanks ron. and if you have any thing else it could be lmk
#12
Honda-Tech Member
Join Date: Feb 2012
Location: Sunrise, FL
Posts: 86
Likes: 0
Received 0 Likes
on
0 Posts
Re: Lower radiator hose doesn't heat up? No overheating though.
i have same problem. my rad fan turned on and my lower hose was still cold on lower part just like yours.....i have a oem honda thermostat im going to swap in tomorow.
ill let you know if my lower hose heats up after.
i have no problems with overheating either. but i can see the thermostat is stuck. the upper hose will be pressurized and the lower feels soft.
ill let you know if my lower hose heats up after.
i have no problems with overheating either. but i can see the thermostat is stuck. the upper hose will be pressurized and the lower feels soft.
#13
Re: Lower radiator hose doesn't heat up? No overheating though.
So I was having this issue, I just did the head gasket myself for the first time. I accidently installed it backwards. car runs and drives fine. but doesnt flow coolant, which is obviously bad for your motor.
#14
Honda-Tech Member
Join Date: Jun 2012
Location: Guyton, GA
Posts: 108
Likes: 0
Received 0 Likes
on
0 Posts
Re: Lower radiator hose doesn't heat up? No overheating though.
I am having this exact issue! I bought my car Wednesday with a surging idle and a non working temp guage. I cleaned everything IACV, PCV Valve, even took the throttle body off and unmounted the FITV and cleaned the crap out of it. Re-assembled everything with new gaskets and the surging went away, but now my lower hose and my radiator will not warm up. I noticed block sealent in my radiator when I flushed it. I replaced my thermostat and Coolant temp sensor, still nothing. I guess we are all in the same shoes, I am just going to replace my whole engine with a new heater core and radiator. That should fix the problem!
#16
Honda-Tech Member
Join Date: Jun 2012
Location: Guyton, GA
Posts: 108
Likes: 0
Received 0 Likes
on
0 Posts
#17
Re: Lower radiator hose doesn't heat up? No overheating though.
Bottom hose SHOULDN'T be hot. As that stuff is going into your motor to cool it, the TOP should be hot, as that is the coolant that has just cooled your motor. Hot coolant enters the top, flows through the radiator, out of the bottom, into the engine. It is fine. If it's not broke, don't fix it.
Thread
Thread Starter
Forum
Replies
Last Post
dbailey
Honda CRX / EF Civic (1988 - 1991)
11
01-30-2020 04:27 AM
d16a9_edcivic
Honda CRX / EF Civic (1988 - 1991)
13
12-14-2008 11:50 AM
Uncle Ben's
Honda Civic / Del Sol (1992 - 2000)
2
01-20-2008 08:22 AM