Coolant dripping from front driver side fender - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**kna4977** · 09-22-2024, 11:05 PM

All the sudden I have coolant dripping out of the bottom of the front driver side fender. Just started. Truck hasn’t been cranked in at least a week if not closer to two weeks. any ideas as to why and how to fix? Last thing I did was bleed the sysyem add an overflow hose through the bottom front of the passenger fender well. I also topped the coolant off but that’s been 2 or 3 weeks ago.

**1970cstblazer** · 09-23-2024, 07:56 AM

It's not the heater core if on the drivers side. Must be a leak from the upper radiator hose, or water pump if it's slinging coolant. A visual inspection is in order..

**Palf70Step** · 09-23-2024, 10:23 AM

also make sure ur drain plug is intact. I have had a radiator with a plastic plug just cracked on me and started dripping.

**kna4977** · 09-23-2024, 11:45 AM

Here are some pics. Doesn’t appear to be leaking from upper hose or drain plug. Mostly under the driver side corner. There’s a little on the right side under the return hose. Couldn’t get a picture. Nothing in between.

**Palf70Step** · 09-23-2024, 01:25 PM

Loosen the fan shroud and pull it away so you can look at the seams and cores to see if there is a drip there.

**truckster** · 09-23-2024, 02:12 PM

My guess is it's coming from your radiator and it's just dripping there because it's a low point.

**Fbks_Cruiser** · 09-23-2024, 02:25 PM

"Last thing I did was bleed the sysyem add an overflow hose through the bottom front of the passenger fender well. I also topped the coolant"

I suspect spilled coolant running along the radiator support and dripping out of the drivers side. Also, unless you have a coolant recovery tank, these systems do not run with a completely full radiator (normally they are down an inch or so from the top). If you filled the rad to the top and then ran the vehicle it will dump some coolant from the overflow until the system reaches its happy level. This may be what you are seeing.

**kna4977** · 09-23-2024, 05:00 PM

Most likely. Radiator is brand new though so it’s strange to me that it just started out of the blue. Hasn’t been run in weeks and no work has been done in the area it’s coming from.

weq92f · 09-23-2024, 07:23 PM

.

Couple days ago my radiator started leaking. The culprit turned out to be a big rat. Just sayin.

-Kevin

**Rust_never_sleeps** · 09-23-2024, 07:29 PM

Quote:

Originally Posted by truckster

My guess is it's coming from your radiator and it's just dripping there because it's a low point.

Thinking that too.
The ol' "rinse and hope it doesn't repeat" test seems appropriate

**kna4977** · 09-23-2024, 09:19 PM

Quote:

Originally Posted by weq92f

.

Couple days ago my radiator started leaking. The culprit turned out to be a big rat. Just sayin.

-Kevin

Truck kept inside and I work on it most of the time. Don’t think this is likely.

**kna4977** · 09-23-2024, 10:07 PM

Noticed the radiator cap is 9# not sure if that may have anything to do with it and the fan shroud doesn't fit up flush with the radiator. Mounts to the radiator hold down brackets but has about a 1/2" gap between the radiator support and the back of the brackets.

**1970cstblazer** · 09-24-2024, 07:20 AM

Original caps are 15#, which will make any leaks worse.

09-22-2024, 11:05 PM	#1
kna4977 Senior Member Join Date: Jul 2006 Location: Midlothian TX Posts: 384	Coolant dripping from front driver side fender All the sudden I have coolant dripping out of the bottom of the front driver side fender. Just started. Truck hasn’t been cranked in at least a week if not closer to two weeks. any ideas as to why and how to fix? Last thing I did was bleed the sysyem add an overflow hose through the bottom front of the passenger fender well. I also topped the coolant off but that’s been 2 or 3 weeks ago.

09-23-2024, 07:56 AM	#2
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,544	Re: Coolant dripping from front driver side fender It's not the heater core if on the drivers side. Must be a leak from the upper radiator hose, or water pump if it's slinging coolant. A visual inspection is in order.. __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

09-23-2024, 10:23 AM	#3
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,958	Re: Coolant dripping from front driver side fender also make sure ur drain plug is intact. I have had a radiator with a plastic plug just cracked on me and started dripping. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

09-23-2024, 11:45 AM	#4
kna4977 Senior Member Join Date: Jul 2006 Location: Midlothian TX Posts: 384	Re: Coolant dripping from front driver side fender Here are some pics. Doesn’t appear to be leaking from upper hose or drain plug. Mostly under the driver side corner. There’s a little on the right side under the return hose. Couldn’t get a picture. Nothing in between. Attached Images

09-23-2024, 01:25 PM	#5
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,958	Re: Coolant dripping from front driver side fender Loosen the fan shroud and pull it away so you can look at the seams and cores to see if there is a drip there. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

09-23-2024, 02:12 PM	#6
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,939	Re: Coolant dripping from front driver side fender My guess is it's coming from your radiator and it's just dripping there because it's a low point. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

09-23-2024, 02:25 PM	#7
Fbks_Cruiser Senior Member Join Date: Apr 2016 Location: Fairbanks, AK Posts: 340	Re: Coolant dripping from front driver side fender "Last thing I did was bleed the sysyem add an overflow hose through the bottom front of the passenger fender well. I also topped the coolant" I suspect spilled coolant running along the radiator support and dripping out of the drivers side. Also, unless you have a coolant recovery tank, these systems do not run with a completely full radiator (normally they are down an inch or so from the top). If you filled the rad to the top and then ran the vehicle it will dump some coolant from the overflow until the system reaches its happy level. This may be what you are seeing. __________________ 1972 GMC K2500 Super Custom Matt

09-23-2024, 05:00 PM	#8
kna4977 Senior Member Join Date: Jul 2006 Location: Midlothian TX Posts: 384	Re: Coolant dripping from front driver side fender Most likely. Radiator is brand new though so it’s strange to me that it just started out of the blue. Hasn’t been run in weeks and no work has been done in the area it’s coming from.

09-23-2024, 07:23 PM	#9
weq92f Registered User Join Date: Oct 2016 Location: Dallas Texas Posts: 3,113	Re: Coolant dripping from front driver side fender . Couple days ago my radiator started leaking. The culprit turned out to be a big rat. Just sayin. -Kevin __________________ 67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold

09-23-2024, 10:07 PM	#12
kna4977 Senior Member Join Date: Jul 2006 Location: Midlothian TX Posts: 384	Re: Coolant dripping from front driver side fender Noticed the radiator cap is 9# not sure if that may have anything to do with it and the fan shroud doesn't fit up flush with the radiator. Mounts to the radiator hold down brackets but has about a 1/2" gap between the radiator support and the back of the brackets.

09-24-2024, 07:20 AM	#13
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,544	Re: Coolant dripping from front driver side fender Original caps are 15#, which will make any leaks worse. __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels



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