This Jeep Grand Cherokee Laredo with the 4.0l straight six engine came in. The driver said it needed a water pump and the thermostat had already been replaced. During the inspection we found that thermostat housing was leaking antifreeze all over the serpentine belt and the water pump and cooling fan was blowing engine coolant all over the engine compartment. Further inspection revealed that the thermostat housing bold was threaded between the thermostat housing and a metal heater core bypass hose that screws into the water pump. We removed the thermostat and housing and found orange RTV silicone sealant covering the thermostat gasket. The bench grinder with a wire wheel was used to restore the sealing surface of the thermostat housing and the thermostat was reinstalled with the radiator hoses and heater core hoses. During the test drive, the engine seemed to misfire and backfire. There is no check engine warning light on the dash.
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”Intro Music by Karl Casey @ White Bat Audio”
Thanks to Jesse for making the intro and graphic for us to enjoy!!!
Check out our Website/Merch HERE: https://www.RainmanRaysRepairs.com Look for links to our other channels, appointment and contact info, and our new merch lineup with custom T's fitted hats and MORE!
Wife Unit unveils our custom tumblers and mugs https://youtu.be/5Q2DWBes258 also found at https://www.RainmanRaysRepairs.com
Support the Channel with a Like and Subscribe!
Become a Channel Member or visit Patreon at https://www.patreon.com/RainmanRaysRepairs
Visit our Second Channel on YouTube, RainmanRay Off Duty https://www.youtube.com/c/RainmanRayOutoftheShop
Follow on Twitter (X): @RainmanRay4Real
TikTok: www.tiktok.com/ @rainman_rays_repairs
Located in Florida? Need work done?? Visit www.RainmanRaysRepairs.com
Check out my Merchandise shop for Men's and Women's Apparel, MUGS and Stickers at http://www.RainmanRaysRepairs.com
Astro Tools 78450 HD Harmonic Crank Pulley Puller - GM LS, Ford Coyote, GMC, Chrysler, Dodge & Jeep, Black https://amzn.to/3STBrX9
As an Amazon Associate I earn from qualifying purchases.
Also, I personally use or have used the products featured in my links and only recommended them if I feel they are of good quality.
#mechanic #repair #autorepair #restoration #wifeunit #brakecleanmafia
”Intro Music by Karl Casey @ White Bat Audio”
Thanks to Jesse for making the intro and graphic for us to enjoy!!!
2004/131600 miles that thing looks smoked. Previous "mechanic" incompetent. LOL.
Is the starter button an aftermarket thing?
Isn't this the same Jeep that triggered so many on a previous video?
What's wrong with red RTV ?
Jeep aka piece of garbage 😮
4.0 baby!
I love those 4.0 engines. Strong, reliable, easy to work on, all steel long block, timing chain (not belt)
As you implied – the bolt situation was fasten-ating 😄
This Jeep should be in much better condition than it is at 131k miles. I have a 1999 Cherokee with over 300k and its in very good condition.
You can actually fit a 12 point socket on the drain valve on the radiator. Can't remember the size but there is one that fits perfectly. Put the socket on a long handle ratchet and it'll come off without an issue. Those Jeep 4.0 straight 6 are almost bullet proof. But not so much if a bad mechanic works on it. I've seen many exceed 300k+. Maybe the new Hurricane 6 Jeep/Ram is now using will be as great. I believe the 4.0 was originally developed by American Motors ? My sweet wifey tries all the time to give me green tea. No way Ray.
He will be a repeat customer when that idler pulley self deletes
customer installed problems???
That gauge cluster does NOT match that vehicle ..that’s 99-00 gauges… that jeep has way more than 130k miles lol
That must have been a bud light nite; dude put it in the wrong hole. 😂
I had a mess of early 2000s GMs with bad catalytic converters that sounded exactly like that minus the misfire, which circles back to why it may be plugged?
I bet the owner watched a YouTube video 🤦♂️😂
My guess is they probably reused the old gasket
I always say to customers who suggest to me what to do that, "If you knew what you were doing, I would not be here!"
Put on the floor big carton it take most of the dirt oil and moor dirty stuf instead the floor
Reminds me of my '85 Cherokee abortion. Hydraulic clutch multiple problems but the crowning achievement of the dealer was replacing the water pump leaker with a reman that had the impeller
on backwards. Overheated about 2 miles down the road, drove back to the dealer who took 5 days to figure out the problem. No further charge and got a free car wash out of it.
May have warped the head from the overheating.
best background music in the world! It's a Jeep Thing!
I’m thinking clogged cat causing the misfire
that is a dumb move to put the screw in wrong hole.
I think there is a very good chance, knowing how people are these days, that when he tells the owner about the big misfire/backfire that was obviously there before Ray worked on it, the guy will say, " what did you do to my car, it was running perfect when I brought it in, it only had a coolant leak."
after working on cooling system change front bearings .. its a jeep
Ray – the green tea should have been poured into the radiator – it wll block anything up – problem solved!
Fun fact. A little bit of chamfer put on the bolt holes of the machined surface side of the thermostat housing gives room for an O ring which will hold the bolts in place for reassembly.
With all of that backfiring or misfiring or whatever it is, I’m a little surprised you didn’t get a check engine light. That thing is running like crap.
Scorpians rock
I squeeze the hose then pop the tee In the spill free, so when you tank the funnel off u don't leak
They way that bolt was fitted just proves some people should never be allowed to even pick up a spanner
I bet head gasket blew they got it hot And burning water See if steaming out exhaust
A spray adhesive for that vertical gasket helps here 😊
Use HDX. Glad to see it performs well compared to others. They are getting old too, but no noticeable degradation sitting in a cupboard.
Nasty clown the alt does not like water
He must of brought it to the meth mechanic.
I appreciate your dedication to filming your work, but sometimes I really wish you'd just put your phone down and use 2 hands so we don't have to watch you continue to struggle with something that would take you 2 seconds with 2 hands. 😂
It's too bad you don't do transmissions tho…
the idiot that replaced the thermostat…. leaking and leaking and maybe risking of causing a headgasket to fail and a cilinderhead to crack…. the owner trying to save a few bucks… This is why I do this kind of work myself, so I know it's done properly. I prefer taking a day off rather than letting someone else that I don't know doing work on my car. I think people should do more by themselves, teaching their children how it's done. Be independent and in control. Everybody I know goes to the shop for oilchanges and sparkplug replacements, but why not do it by yourself? I guess people are just lazy
Stairway to Heaven in the background awesome song
When I heard “Stairway to Heaven” playing, I thought the Jeep was on its way to jeep heaven.
Another great info-taining video. I laughed when the wife unit delivered green tea. I recalled that green tea improves memory. Every time I drink some, I remember it tastes like crap !!. Thx.
I love a straight six engine! A symphony of smooth. Owned a Grand Cherokee and despite the intermittent cutting out it was a sweet engine
Looks like this Jeep got a case of stage fright – those bolts made their grand escape!
Red, blue or black schmooze (in very small amounts) is useful to keep the gasket in place while getting the bolts started.
Soft hose, chewed up belt, change them before they leave you walking.
I feel that battery may have a parasitic draw because it seemed to start fine after the alternator ran for just a little bit.
But I'm just a parts changer, not a mechanic.
That engine has a blown head gasket…thats what is causing the leaking valves/backfires. Overheating damaged that engine.
You should have flushed that nasty system to remove as much of that rust and corrosion as possible.
they probably thought the bolt was in the hole and sent it.
We live in such a competent world. Too bad we have to have warning labels instead of "survival of the fittest". This was about the dumbest mess-up I've seen in a long while.
"hold my empty case of beer, so I change this here thermostats" while drinking the second case…
Chrysler ruined the jeep line, when Amc had it it was a great brand.
We've seen this heep before haven't we , I think we've seen that hokey push button before !
Ray, check the engine ground/dipstick mount stud . . It can be loose/corroded and cause a very difficult to diagnose misfire only under load. Also check that theres not a vacuum leak where the intake/exhaust bolt to the head, because thats a 4.o thing. Also, I'd bet the driver side engine mount is broken. It's a Jeep thing.
Thanks for showing us the coolant system colonoscopy. 😷
Always nice to see professional mechanics using Harbor Freight stuff.
You have soooo much patience with flashlights they would be on the other side of the shop if that were me
Check the plug wires Ray. They very well could be the originals and are deteriorated and saturated with anti-freeze which could make them arc to any metal they are routed close to. That condition could also be exacerbated by the spark plug gap being too wide.
Oh thank you for brining Lauren in for her mandatory appearance. LOL She is such a sweetheart brining you coffee and lunch. I was always told never to work with family….it never ends well. But you guys seem to work amazingly together! You guys are both amazing!
YOU FORGOT TO WARN US TO PUT ON SAFETY SQUINTS!!!!! I have gasket material in my eyes now!
Ah a Jeep in its natural habitat: on a hoist
That Jeep is about down for.
Typical JEEP, “Just empty every pocket”.
as for the backfiring/cut out…….. those jeeps had a problem with the ecm shorting to the frame, the fix is to shorten the screws that hold it in….. dont ask me how I know
I'm thinking…. SCRAP IT!
Considering the skill of the previous mechanic, it is amazing that the engine is still running and capable of back firing.
I have noticed that you do a lot of work one handed having to hold the gopro with the other. There is no way to wear the gopro to free up the other? hand?
One of the funniest things I've ever seen!,
that vehicle does not get much TLC….. 😢
Car Wars. Return of The Wife Unit. 😏👍
I've seen jeeps, come into my dealership all the time.
Your lucky to have gorgeous HOT wife Ray 😊
The only way I can see that is if they didn't line up the thermostat housing properly and then sent the fastener without realizing that they weren't even in the hole lbvs😂😂😂
you are such a butcher. Grinding with a cookiewheel and not covering up the inlet, that should,be a new housing, not reusing the old one. You are better suited for a mexican junkyard
Isn't this the same jeep that had one issue after another🤔 lbvs
Thermostat problem not noticed – air bleed hole missing. The Jeep Service Manual (I have the 1996 edition, see pages 7-32 & 7-33.) states there should be a 1/16" to 3/32" air bleed hole in the flange of the thermostat on the 4.0L I6 and this hole should be at the top, 12 o'clock, position. A factory part was the hole, but aftermarket thermostats never do, so it must be drilled. If this isn't done, air is trapped in the head causing hot spots until the tstat opens.
When the thermostat came out it looked a bit sludgy in the head, almost like oil had managed to get in there too.
Welcome to a new episode of Just Rolled In… Oh Wait… Wrong channel! 🤣
Uhh Ray …..it needs a new serpentine BELT metal is showing sir..along with hoses and the Chernobyl engine degreasing protocol!!!!
Good lord. What a botch job. How do you mess up that badly while being confident enough to even attempt to dismantle something on the engine?
Ray Ray you really should fasten that grinder to the table brother. You get to grinding hard like the plumbing company and that thing is gonna unravel your hand
I was thinking looking at the oil on dip for the milky death clue before starting
its just a pile of crap lol
Jeep can't even engineer a radiator drain.
How do you miss the hole and walk away thinking the bolt is tight? What are the odds the bolt unscrews itself and lands in that spot? Twilight Zone auto repair
Great video Ray. I like that funnel thingy
Push button starter 😂
Nice!
Coils got wett ! Only
It's a mass of "Jeep Things".
They had cooling problems. I would have checked the oil very first thing just to make sure there wasn't no antifreeze in the oil..
1754 I thought employing minions was against Labour laws?
As Mr Bob Ross would say : We dont make misstakes, we have happy accidents
Could’ve used this video a couple days ago, just did all that to my 03 4.0
A squirter?
This car has probably been to another shop for a diagnosis and estimate for the thermostat but, you know, the owner "Knew a guy" that could do it cheaper.
If I'm not mistaken those bolts go into the water jacket! You should have put gasket sealant on them.
If you start the bottom bolt by fingers then jam the socket against the belt with the free hand it will deflect enough to let you tighten it….I was in there four times in one day testing thermostats so I figured out what worked.