• Register Today It's free! This box and some ads will disappear once registered!

Cooling system “banging”

Berepair

New Member
Joined
May 14, 2020
Messages
9
Reaction score
3
City, State
WOODSTOCK
Year, Model & Trim Level
89 Ranger 92 Explorer 2wd
My 92 Explorer cooling system, in the cold weather, would bang at idle until the engine got to full temp. This winter it was doing it all the time (still only at idle) even when warm. I read somewhere on a forum about maybe rerouting some hosing or something???
Anyone here familiar with this phenomenon?
4.0 2wd auto 150k+ miles and still running 😁
Thanks!
 


Join the Elite Explorers for $20 per year. Gets rid of the ads! New $5 per month "try out" option.

Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see no advertisements, no banner ads, no double underlined links, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create and save more private Conversations, and more. Join Today. Your support is greatly appreciated.




RangerX

Elite Ranger
Staff member
Moderator
Elite Explorer
Joined
July 14, 1999
Messages
10,118
Reaction score
367
City, State
Omao, Kauai
Year, Model & Trim Level
'93 Ranger XLT 4X4
Never heard of that, what makes you say it’s the cooling system thats banging and not anything else under the hood?
 




Berepair

New Member
Joined
May 14, 2020
Messages
9
Reaction score
3
City, State
WOODSTOCK
Year, Model & Trim Level
89 Ranger 92 Explorer 2wd
Never heard of that, what makes you say it’s the cooling system thats banging and not anything else under the hood?
It was only happening when it's cold (wintertime), before the engine fully warmed up, and at idle. Under throttle thumping was not there. Also would continue for a minute or so after truck was turned off. I only live a mile or so from my shop so truck never really gets fully warmed when I commute. Used to happen only if engine wasn't fully warmed (no issue/noise if driven 20 miles).
Banging/thumping similar to if adding water to an overheated radiator/engine before it cools.
Now, seems to happen even if I drive it for a longer time (fully warmed). Again, only when outside temp is cold (maybe below 50 degrees???).
It's been a few years (3 maybe more) like this, totally bearable as I only commute 4 miles a day total. Just it's been getting a little worse.
Like I said I was reading some forum and kinda remember something about it. Probably need to flush the cooling system (PITA) to make it stop.
I'll update if it continues into the warmer weather now.
Thanks for the reply!
 




~X~

Elite Explorer
Joined
October 21, 2014
Messages
75
Reaction score
29
Location
Shady cove, Oregon
City, State
Southern Oregon
Year, Model & Trim Level
2000 XLT
Have you ever changed the thermostat or heater core? Done a cooling system flush?
Add water often?
 




Berepair

New Member
Joined
May 14, 2020
Messages
9
Reaction score
3
City, State
WOODSTOCK
Year, Model & Trim Level
89 Ranger 92 Explorer 2wd
Have you ever changed the thermostat or heater core? Done a cooling system flush?
Add water often?
No, no, no, add coolant sporadically (timing cover external seepage sometimes). Heat works good. AC even works well (at least last year it did😁).
Today it’s warm outside, no banging. Probably won’t do it again until next Fall. If it last that long. Probably will, I’ve had this truck for about 7 years and almost never lets me down. 🤞
 




MakinJeepsWeep!

Elite Explorer
Joined
October 1, 2020
Messages
311
Reaction score
89
City, State
Polk County Texas
Year, Model & Trim Level
96 Explorer 5.0L AWD
Callsign
Big Red
So its a thumping loud enough to hear in the cab like water gurgling in a hot engine, but it only does it with cool temps. With cooler temps metal should shrink up, with heat, expand, so by some far stretch could your water pump bearing or something of that sort be trying to hang up with the cold weather and loosens up with some heat?
 




TheDudeAbidez

Member
Joined
April 20, 2020
Messages
14
Reaction score
8
Location
NW Montana
City, State
Kalispell
Year, Model & Trim Level
1994 Explorer XLT
your temp sensor only gives a range of indication on the "dial," which unfortunately doesn't give accurate readings for precise temps. That could be part of the issue right there. The "pulsing" is a common issue on 1st gen explorers. There was a "bypass kit" that ford made to help mitigate the underhood "thumping" thats usually caused by a perfect storm of a few different things. Incorrect coolant/water mix (ratio) in addition to deposit buildup in the water jacket of the block, water pump potentially on the way out, or nonstandard and/or off-brand t-stat.
I'd recommend covering all of your bases first to help eliminate the culprit of your issue. Good flush of system (to include heater core,) motorcraft t-stat, repair any leaks in system, and verify you don't have a head gasket leak via fluid content test or leakdown check with a good ear. Air could be getting into the system via head crack or gasket leak. a simple bypass can be put together with some plumbing fittings and extra heater hose, if need be. if its a head and/or gasket, it'll require much more than that, obviously.
i'm sure i have forgotten some things...but the folks here are awesome on this forum. A lot of people with plenty of knowledge and experience. I'm sure they'll chime in soon with more tips. Please keep us posted as your work progresses. Cheers!
 




Berepair

New Member
Joined
May 14, 2020
Messages
9
Reaction score
3
City, State
WOODSTOCK
Year, Model & Trim Level
89 Ranger 92 Explorer 2wd
your temp sensor only gives a range of indication on the "dial," which unfortunately doesn't give accurate readings for precise temps. That could be part of the issue right there. The "pulsing" is a common issue on 1st gen explorers. There was a "bypass kit" that ford made to help mitigate the underhood "thumping" thats usually caused by a perfect storm of a few different things. Incorrect coolant/water mix (ratio) in addition to deposit buildup in the water jacket of the block, water pump potentially on the way out, or nonstandard and/or off-brand t-stat.
I'd recommend covering all of your bases first to help eliminate the culprit of your issue. Good flush of system (to include heater core,) motorcraft t-stat, repair any leaks in system, and verify you don't have a head gasket leak via fluid content test or leakdown check with a good ear. Air could be getting into the system via head crack or gasket leak. a simple bypass can be put together with some plumbing fittings and extra heater hose, if need be. if its a head and/or gasket, it'll require much more than that, obviously.
i'm sure i have forgotten some things...but the folks here are awesome on this forum. A lot of people with plenty of knowledge and experience. I'm sure they'll chime in soon with more tips. Please keep us posted as your work progresses. Cheers!
The "bypass kit" is what I believe I had read about. Any idea how this is plumbed into the system. The cooling system had been noiseless. When I first noticed it I thought I was low on coolant. Originally only doing it after shutdown, on a cold day, when driven for less than 10 minutes. The next Winter it was a little worse (doing it at idle, but still only when engine was cold). Progressively more often but still only when cold. Last month it's gotten to where even after engine is warm (same place on the temp needle) it will bang (thump) at idle. Now that the outside temp is war (above 60) the thump has gone away.

I will do a system flush and clean out the 30 years of crud as best as possible, then see what next Winter brings!

Thanks for the reply.
 




Top