What Causes A Thermostat Housing To Crack

  1. This DIY describes how to replace the thermostat housing and coolant distribution pipe (AKA crack pipe) on the MKIV VR6 motor. This covers most of the weak spots in the coolant distribution system. If you have a leak in one spot, consider replacing as much as you can afford.
  2. Dec 26, 2016 Hi there. If the thermostat housing was made of plastic (carbon fiber) and the temperature outside dropped below the freezing point of the cooling system, then the coolant would have froze up and expanded causing the thermostat housing to crack.
  3. If the housing or possibly in some models where as the lower housing is part of the lower intake manifold, is cracked then a seal will not withstand the pressure. Replacement may be your only choice.
  4. Progress Thread Cracked The Thermostat Housing 2000gt Conv: 1996 - 2004 SN95 Mustang -General/Talk-2: May 14, 2015: Cracked my thermostat housing: 1994 - 1995 Specific Tech: 7: Dec 28, 2011: T: Ticking Noise After PI Swap- Thermostat Housing Crack: SN95 4.6L Mustang Tech: 4: Jul 9, 2011: Paint and Body Spider Cracks on Front Bumper: Fox 5.0.

However, some of these automobiles came through with the 1.6L or even the 1.4 L turbo engine. Although a coolant leak from the thermostat housing remains the most common issue, additional problems can cause a coolant leak and a check engine light. Here we'll discuss the most common symptoms, failed parts and repair procedures.

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2013 Dodge Journey

Typical Repair Cost:
$610
Average Mileage:
59,500 miles
Total Complaints:
6 complaints

Most Common Solutions:

  1. replace housing (6 reports)

cooling system problem

Thermostat Replacement

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2013 Dodge Journey Owner Comments

problem #6

Journey LE 2.4L V4

  • Automatic transmission
  • 65,694 miles

Plastic housing is not a good idea, last time I checked extreme heat can cause plastic to melt. Pay good money for a vehicle and they cut corners just to strengthen their bottom line. Very disappointed in Dodge.

- Kris F., Enid, US

problem #5

Journey

  • Automatic transmission
  • 46,000 miles

Back in November of 2016 I found out that my coolant system had a crack in the plastic adapter housing. I kept putting coolant in it until July 2017 when I finally got fed up and replaced it. The reason I hesitated to have it done was because I was told that the plastic part had not been changed by the manufacturer and because of the car goes from hot to cold making the plastic weak the plastic crack would more than likely happen again. The mechanic was right because today my car started experiencing the exact same thing it had experienced back in November of 2016. All my coolant was gone from my car so I'm sure I'm having the exact same problem again not even a year after replacing the part.

- sanajr, Tucson, US

problem #4

Journey S 4.3L

  • Automatic transmission
  • 62,000 miles

I cannot believe that this car has plastic on the engine. What Nut, designed this CRAP @@#$$#@ ?

This should be a cost covered by the dealer. Why would dodge think that we should pay for their poor judgement of putting plastic on an engine……Dum, Dum, Dum….I want a refund, ASAP.

- Kenneth L., Tinley Park, IL, US

problem #3

Journey SXT 4 cyl

Thermostat Housing For Chevy Aveo

  • Automatic transmission
  • 73,000 miles

A D V E R T I S E M E N T S

OK, I've contacted Dodge to report the design flaw that is the plastic adapter housing and the need for 2 thermostats. The cost to repair the vehicle is $670 plus tax. Apparently my Journey needs a new adapter housing, 2 thermostats, o-rings, and 2 or 3 hoses. WTF Dodge?!?!?!?! I bought this damn vehicle new in order to avoid a repair like this. I've maintained my car according to the manufacturer's suggestions and this is what I get.

The customer service person was super unhelpful. Maybe others with this problem should report it to them so they might finally see that cheap plastic on a hot engine is not the best way to build a car. I have no idea how I'm going to get this fixed since I have 4 kids and a car payment. Sorry I'm pissed and frustrated.

- Julie S., Saint Louis, MO, US

problem #2

Journey 4 cyl

  • Automatic transmission
  • 57,068 miles

Well, I found it interesting that someone had the exact same thing happen around the same mileage. It sounds like it might be a common problem with this part being plastic on this vehicle. The other complaint was..

This is an engineering issue and should be resolved, I should not pay for this as it is something that is going to recur in another 50,000 miles or less due to the heat being so hot on the thermostat area. If you take plastic and put it in an oven at 200 degrees Fahrenheit it is going to melt. Does not matter what type of plastic it may be. They are replacing with the same plastic that was in it before and charging me to do so.

I just feel it should have been under the warranty work. Good to know for in the future.

- Angela F., Fort Collins, CO, US

Search CarComplaints.com for these popular complaint phrases..

problem #1

Journey 4 cyl

  • Automatic transmission
  • 53,000 miles

This is an engineering issue and should be resolved, I should not pay for this as it is something that is going to recur in another 50,000 miles or less due to the heat being so hot on the thermostat area. If you take plastic and put it in an oven at 200 degrees Fahrenheit it is going to melt. Spss latest version free download. Does not matter what type of plastic it may be. They are replacing with the same plastic that was in it before and charging me to do so.

- cbabcock2005, Chaumont, NY, US

My engine light came on and I took my 2016 Jeep Cherokee latitude in and it is still under 36000. This was just after a hard freeze and I purchased and had the vehicle less then a week. They kept it 2 weeks and then the repaired it saying it was just a simple mechanical malfunction of the thermostat housing. What would cause such a malfunction?

My car has 32000 miles.
My car has an automatic transmission.

Marvin Sunderland
22 years of experience

Hi there. If the thermostat housing was made of plastic (carbon fiber) and the temperature outside dropped below the freezing point of the cooling system, then the coolant would have froze up and expanded causing the thermostat housing to crack. Also, if the coolant has too much electrolyte causing a slight voltage in the coolant, then the chemical compound will break down causing the cooling system to eat up seals and carbon fiber.

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