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Thread: Correct way to fill cooling system help?

  1. #16
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    Quote Originally Posted by 90blacksc View Post
    Anybody know what's the name of the hose that run from the thermostat housing to the front of the intake manifold.
    Bypass hose - see: https://www.autozone.com/ignition-tu...eVehicle=false

    ...don't be put off if you get one that you need to cut to the correct length so that it fits and matches the original.

  2. #17
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    So update on the car. I replaced the bypass hose earlier in the week. I ran the car at the house woth the a/c off, car ran fine didn't run hot. Took the car out today for a drive and started to run hot again. I've replaced the ECT and the sensor on the thermostat housing near the bypass hose. I've also replace the IRCM. I'm not sure what's next.

  3. #18
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    ...and what about that bubble stream in the expansion tank?

    Remind me - did you replace the radiator cap yet?

  4. #19
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    Quote Originally Posted by KMT View Post
    ...and what about that bubble stream in the expansion tank?

    Remind me - did you replace the radiator cap yet?
    Once the car starts to run on the warmer side I get bubble in the expansion tank. I have not replaced the cap

  5. #20
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    A consistent bubble stream might be cracked head(s) and/or failing headgasket(s). Might as well throw a new 16# cap at it, on the hope that it helps. If not, that's one less thing you'll need to buy when you do the heads/gaskets.

  6. #21
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    Quote Originally Posted by KMT View Post
    A consistent bubble stream might be cracked head(s) and/or failing headgasket(s). Might as well throw a new 16# cap at it, on the hope that it helps. If not, that's one less thing you'll need to buy when you do the heads/gaskets.
    I'll pick up a new cap and see what happens

  7. #22
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    Quote Originally Posted by KMT View Post
    A consistent bubble stream might be cracked head(s) and/or failing headgasket(s). Might as well throw a new 16# cap at it, on the hope that it helps. If not, that's one less thing you'll need to buy when you do the heads/gaskets.
    What can be causing it to run hot

  8. #23
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    Quote Originally Posted by 90blacksc View Post
    What can be causing it to run hot
    Exhaust gases in the cooling system.

    AutoZone has a test kit you can rent that will check.

    Ny '90 SC is parked right now for the same symptoms, and I confirmed gases in the cooling system. Soon as I can budget $400 for fresh heads, it will be back on the road.
    Last edited by KMT; Yesterday at 11:42 PM.

  9. #24
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    Quote Originally Posted by KMT View Post
    Exhaust gases in the cooling system.

    AutoZone has a test kit you can rent that will check.

    Ny '90 SC is parked right now for the same symptoms, and I confirmed gases in the cooling system. Soon as I can budget $400 for fresh heads, it will be back on the road.
    I was really hoping this wouldn't be the case

  10. #25
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    Feel your pain...had the same hope until I got my hands on the test kit and confirmed.

  11. #26
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    Quote Originally Posted by KMT View Post
    Feel your pain...had the same hope until I got my hands on the test kit and confirmed.
    So on yours did you have more than a head gasket problem. Since you're waiting to purchase new heads. If you don't mind me asking where are you getting the heads from

  12. #27
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    Quote Originally Posted by KMT View Post
    Exhaust gases in the cooling system.

    AutoZone has a test kit you can rent that will check.

    Ny '90 SC is parked right now for the same symptoms, and I confirmed gases in the cooling system. Soon as I can budget $400 for fresh heads, it will be back on the road.
    Just called all the local parts stores around me here and none of them know what that tool is. They said they don't have anything like that to rent would you happen to know exactly what it's called because these people around here aren't very bright

  13. #28
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    I haven't yanked the heads themselves yet. My choice is to not plan on it just being gaskets (cracked heads* are not uncommon, I believe), and once these heads come off, they'll basically be just cores.

    I talked to local shops, and an outfit in Texas, I think. CHI - Cylinder Heads International - https://www.shop.headsonly.com/main.sc - Best to call them when looking for SC-specific heads, they were very helpful. When I called, they only had one ready, so unless that changes by the time I do the work, I expect to ship mine to them first.

    CHI makes it as easy as possible, meaning they ship fresh heads to me and I return mine in the same boxes, all freight built into the transaction. Matter of couple days to receive. If they don't have a pair on hand, they send me boxes, I ship mine and they turn them around, no matter what work they need, in approx. one week. One price gets me fresh heads regardless of what it takes to make that happen, 12 month warranty.

    Local shops didn't seem interested, wanting to inspect, then quote work, cost for crack fixes, etc., getting to them as they have time, etc. Quotes when I could get them were always slightly more than CHI - I was afraid of cost creep and being committed once they had my heads, which won't happen w/CHI.

    * It's my opinion when you have symptoms on the car of overheating after running a while, with a not big bubble stream in the expansion tank that at least one head is cracked. Badly blown gaskets are more like when you see steam out the exhaust and the engine oil and coolant in the expansion tank turn into a milkshake. I don't have coolant in my oil, but like I said, I do have exhaust gases in the coolant, and same thing, it can run at normal temp if not stressed, but it always goes hot and bubbles (not big) if any load put on it or you just let it idle for 20 ~ 30 minutes, even when the fan works properly.

    The tool is a test kit. The test fluid is sometimes separate. AZ's tool program works where you buy it, then use it, then return it and they refund. They didn't even charge me for the test fluid I went thru. The kit and fluid if you buy is around $30 ~ $40. Run the engine until you get a bubble stream, add the required amount of fluid to the tester, push the bottom of the tester into the fill hole on the expansion tank so it seals, and pump the bulb on the top. This will draw the air from out of the expansion tank up thru the fluid which will change color if exhaust gases are present. Took me a couple tries to get the hang of it, but not too difficult otherwise.

    https://www.autozone.com/loan-a-tool...ester/391378_0
    https://www.autozone.com/test-scan-a...uid/391381_0_0

    If you have to buy them, I found both for sale on eBay, same items.
    Last edited by KMT; Today at 02:44 PM.

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