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#4655210 - 02/03/18 07:31 PM Coolant cap failure
toneydoc Offline

Registered: 12/16/11
Posts: 1696
Loc: War Eagle
My 94 Jeep has been leaking or burning coolant for the past month or so.
I have been adding coolant/water mix and it has used 2 gallons in the past month
I have looked in the engine compartment at least 6 times the past month and never saw any coolant spraying or leaking
Today was a nice day here in the south and I looked again. The reservoir was empty and radiator down 8=10 ounces
Put the cap back on and looked as it warmed up to operating temp and voila, coolant leaking from around the radiator cap
Dang. Never saw that before today.
Went to auto parts store and bought new cap and put it on and cranked Jeep. Seemed to be not leaking.
I have had many parts fail but never a radiator cap
Hopefully this solves the mystery. Will let you know if it does not. Cheers
1994 Jeep 158k Mobil 5000 5w30
2014 Camry 32k QS AD 5w30
2018 Jeep Cherokee 1k factory fill
2014 HD Ultra 35k Mobil1 15w50
2012 Rav4 35k PP 5w20

#4655241 - 02/03/18 07:58 PM Re: Coolant cap failure [Re: toneydoc]
HoosierJeeper Offline

Registered: 11/23/16
Posts: 1276
Loc: WI
What brand was it?

On my XJ I had a Motorad one fail after like 6 months, then bought a Napa one (realized it was a Motorad too) and it's been on there for about a month. I'll get around to getting an OEM one someday.
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

#4655276 - 02/03/18 08:28 PM Re: Coolant cap failure [Re: toneydoc]
Chris142 Offline

Registered: 06/05/03
Posts: 16820
Loc: Deplorable in apple valley, ca
Stay away from the motor rad caps. Stant is the best,usually the OE is made by stant. Your supposed to replace the cap every couple years.
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

#4655292 - 02/03/18 08:43 PM Re: Coolant cap failure [Re: toneydoc]
Nick1994 Offline

Registered: 02/19/13
Posts: 10108
Loc: Phoenix, AZ
I got a radiator cap last summer for my Cherokee from O'Reillys. It was the cheapest made thing you ever saw, like it was formed out of an aluminum can. I recently replaced it again with one from the dealer.
2015 Hyundai Sonata 2.4L 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

#4655350 - 02/03/18 09:52 PM Re: Coolant cap failure [Re: toneydoc]
Leo99 Offline

Registered: 03/30/14
Posts: 3041
Loc: NJ
Had a radiator cap fail on my Rav4. Was ready to tell my wife it was a head gasket and play taps. $8 later and it is running great.
Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles
2004 Rav4 359,000 miles
2015 Camry 59,000 miles

#4655727 - 02/04/18 10:38 AM Re: Coolant cap failure [Re: toneydoc]
GMBoy Offline

Registered: 11/22/04
Posts: 7702
Loc: Texas
The worst caps I've seen were Gates. Flimsy and had 2 leak. Motorad actually supplies some OEM applications and are not bad in most applications. Stant is not what they used to be but still make a decent aftermarket option. I use OEM mostly so I assured the correct spec and not some "window" that fits more than one application.