Catera Thermostat Relocation ??
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  • 1 Post By Submariner409
  • 1 Post By JohnJJO
Cadillac Catera and Cimarron Forum Discussion, Catera Thermostat Relocation ?? in Past Cadillac Vehicle Discussion; Every couple years or so I have to change the thermostat in this Catera, and for anyone who has changed ...
  1. #1
    RetardedGenius's Avatar
    RetardedGenius is offline Cadillac Owners Member
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    Catera Thermostat Relocation ??

    Every couple years or so I have to change the thermostat in this Catera, and for anyone who has changed one on a Catera, you already know that it is pretty much the most horrible, godawful, nightmare of a job in all of automotive history.

    The whole upper section of the engine is now apart, and the thermostat is now out.

    Here's my idea:
    Instead of putting another thermostat in and putting it back together normally, I'm thinking of removing the thermostat from the thermostat housing completely, and otherwise putting it back together normally then cutting the upper radiator hose in an easily accessible spot and putting an in-line thermostat (& housing) in the top radiator hose.
    It won't be that difficult. I figure I could use this in-line thermostat kit from Jegs http://www.jegs.com/i/JEGS-Performan...ductId=2677715 or I could go cheap and just use any 2 straight water outlets and a universal thermostat.

    Can anyone think of any possible reason why I perhaps shouldn't do this? It just seems waaaaaay too easy to be a good idea. There has to be some kind of drawback to it, although I can't seem to think of one.
    Please let me know if you can think of any.
    -RetardedGenius

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    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Why are you replacing the thermostat so often??

  4. #3
    RetardedGenius's Avatar
    RetardedGenius is offline Cadillac Owners Member
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    Re: Catera Thermostat Relocation ??

    No idea. My theory is that there must be something in Dex-cool that corrodes them more rapidly than regular antifreeze. Although that's just a theory; I have no idea if there's actually any merit to that theory. I also get a leaky heater valve @ every 2-1/2 years, and have to replace the water pump every two years like clockwork. (lifetime warranty ) The only problems I ever have with this car are coolant system problems.

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    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    There is NOTHING about DEX-COOL that causes any problems whatsoever.

    You're either buying the worst thermostats and water pumps available, or you're using some nasty water.

    AutoZone parts?

    Are you using just tap water?

  6. #5
    Submariner409's Avatar
    Submariner409 is online now If it won't run, chrome it
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    Re: Catera Thermostat Relocation ??

    Most of these GM thermostats seem pretty reliable - most cars in here, regardless of age, still have the factory installed unit.

    The thermostat is acted upon by not only coolant in the "top hose" - it's really controlled by circulation in the heater and block/head bypass circuits. You stick it up in the "top hose" and it would never open - What coolant flow would warm up the wax pellet cylinder to begin the opening process ?

    DEX-COOL doesn't corrode anything - take a look at the water jackets and radiator/heater cores of a properly maintained cooling system.
    mrrick likes this.

  7. #6
    JohnJJO's Avatar
    JohnJJO is offline Cadillac Owners Fanatic
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    I have 160000 miles on mine, I changed my thermostat about 5000 miles ago. It was just fine, only had a small leak on gasket that can be replaced, but I was replacing my oil cooler and I had to remove all top so I got great access to it and decided to replace termostat too, not only gasket even it was clean and worked just fine, but had over 150000 miles on oem termostat. I ordered oem AcDelco termostat from rockauto, it came with a gasket no bolts. Oem two bolts will not fit in new design of thermostat, yes AcDelco for some reason re-design thermostat. Its got more thicker. Original two bolts simply not long enough. U can get them from dealer ship, (cost to mush + no stock, special delivery), I got mine from local bolts and screws store, I simply brought original bolt to the store and the guy that work there gave me 2 rust proof bolts with same link but longer, I paid like $1 for them. They fited just right. VERY IMPORTANT that 1 of the bolts need to be sealed with hight temp silicone or thread locker, becouse 1 thread goes in block and coolant can leak from bolt. Any more questions just simply pm me
    mrrick likes this.

  8. #7
    mrrick is offline Cadillac Owners Member
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    Re: Catera Thermostat Relocation ??

    I just replaced the thermostat on 1999 catera. I figured since I replacing water pump and timing belt with Gates products I might as well replace the thermostat with a Gates as well. These thermostatsopen against the flow and are self cleaning. Even though the old thermostat worked fine and the Dex-cool was in perfect shape I replaced that as well which is recommended at 100,000 or five years. Getting to the thermostat housing and the hidden torx bolt which holds the tube, dipstick and engine puller proved to be a real challenge. I replaced the torx bolt with a metric 25mm Alen Head machine bolt. This was much easier to re-install with alen wrench. My only regret is that the new thermostat is taking way to long to open. My suspicion is that my coolant/water ratio is too concentrated or I have installed a defective thermostat out of the box. DEX-COOL gets a bad rap because people mix other types of coolant which is not compatible and cause the DEX-COOL TO GEL. I also noticed a very slight amount of moisture in the oil cap which is almost non-existent now. I believe JohnJJO has answered my question about the bolt that goes into the block. I will pull the bolts out and put high temp silicone on them. As for why the thermostat is taking so long to open I don't know. I also noticed that my radiator light comes on after 50seconds even though I am not getting any error codes. Could the concentration of the DEX-COOL be part of this problem ??

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