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Coolant cap failure #4655210
02/03/18 07:31 PM
02/03/18 07:31 PM
Joined: Dec 2011
Posts: 1,750
War Eagle
toneydoc Offline OP
toneydoc  Offline OP
Joined: Dec 2011
Posts: 1,750
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 161k Castrol Synblend 10w30
2014 Camry 36k Havoline 5w20
2018 Jeep Cherokee 3k FactFill
2014 HD Ultra 42k Mobil1 15w50
2012 Rav4 39k Mobil 1 0w20
Re: Coolant cap failure [Re: toneydoc] #4655241
02/03/18 07:58 PM
02/03/18 07:58 PM
Joined: Nov 2016
Posts: 1,283
HoosierJeeper Offline
HoosierJeeper  Offline
Joined: Nov 2016
Posts: 1,283
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)
Re: Coolant cap failure [Re: toneydoc] #4655276
02/03/18 08:28 PM
02/03/18 08:28 PM
Joined: Jun 2003
Posts: 17,814
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,814
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 carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Coolant cap failure [Re: toneydoc] #4655292
02/03/18 08:43 PM
02/03/18 08:43 PM
Joined: Feb 2013
Posts: 11,081
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 11,081
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 88k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Coolant cap failure [Re: toneydoc] #4655350
02/03/18 09:52 PM
02/03/18 09:52 PM
Joined: Mar 2014
Posts: 3,475
Leo99 Offline
Leo99  Offline
Joined: Mar 2014
Posts: 3,475
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 (RIP)
2004 Corolla 125,000 miles
2004 Rav4 370,000 miles
2015 Camry 70,000 miles
Re: Coolant cap failure [Re: toneydoc] #4655727
02/04/18 10:38 AM
02/04/18 10:38 AM
Joined: Nov 2004
Posts: 7,803
GMBoy Online content
GMBoy  Online Content
Joined: Nov 2004
Posts: 7,803
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.

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