Question about 1993 Chevrolet S-10 Blazer

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High temp I have a 93 blazer with 4.3 vortec the other day I drove to work ( about a mile and half) I got there and noticed I was leaking antifreeze checked and found bad water pump so I changed it but now if I drive it a distance the temp will get real close to the 260 mark not quite to the red it used to always run in the 210 area could this be caused by a air pocket ( bubble) in the system and if so how do I get rid of it. It is full of fresh antifreeze. Thank you

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  • tdwilkins200 Jan 16, 2009

    Ok I will give it a shot after work

  • tdwilkins200 Jan 24, 2009

    ok I did the squeezing the hose I replaced the thermostat it has a new water pump and it still gets hot i can drive it for a few miles and the needle will climb to 210 which is about where it usually ran and it will stay there for another mile or two and then it makes a pretty quick jump the rest of the way. when I have it running w/out the cap on and the radiator full it will do like a burp of coolant about every 30-60 seconds. any help will be greatly appreciated it just started doing this since the water pump went out but it never did over heat on me

  • tdwilkins200 Jan 25, 2009

    there really isnt any smoke other than on first start up I thought maybe a head or head gasket checked the tail pipe there is just some black residue and the oil is clean no water in it. talked to the place I got the water pump going to take it back and get different one on the chance it was bad,

  • tdwilkins200 Jan 28, 2009

    well I know the water pump is working and changed the thermostat again this time with a ac/delco one and it is still getting hot any suggestions

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It sounds like your thermostate stuck when it ran a little bit warm with that water pump going out..
check you thermostate.. good--luck ray

Posted on Jan 16, 2009

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It sounds like an air pocket... try squeezing the rad hoses a few times and keeping an eye on the level in the rad... this is probably best done with the rad cap off... of course make sure it is cold before you remove the radiator cap.

Robert

Posted on Jan 16, 2009

  • Roberta Smith
    Roberta Smith Jan 24, 2009

    what colour is the exhaust smoke ?



    Robert

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My story and course of action (that you may be able to glean some ideas from)
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Started again, and after approx. 3 - 4 miles of driving, car overheated (almost instantaneous going from normal temp to overheating (noticed it within a block). Overheated 1 block from Dodge dealer on Sun. afternoon. Let car cool down, ensured coolant full, and drove to hotel 2 miles away for night (no problems with overheating, but car may not have gotten back up to temp in those 2 miles- was approx 65 Deg Far ambient. Noticed that when the car does "act up" and heads for overheating, the vents blow cold, even though set for high heat.

Got to Dodge dealer the next morning. Dealer said no external leaks, and no mixing of oil and antifreeze (mixing could indicate blown head gasket). Diagnosed thermostat ($340 for parts and labor), and would be fixed in 3.5 hours. 8 hours later, dealer said finally had thermostat changed, but still overheating. Would try to reblead air out of the cooling system (air or air pockets in the system could cause overheating). Still no luck - car was overheating. So dealer said next thought would be partially plugged radiator. Plan- next morning, send radiator out for testing.

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($225 US), but dealer said was not enough to be causing the problems I was getting. Next guess was to check the water pump, at $700 -$800 labor to see if it was defective. Dealer said, but I have not confirmed, that car would idle fine for unlimited time without overheating, but when took out for drive, it would overheat. The cooling fan was functioning properly.

Well, at that stage, decided to just tow car home, and fix there so I rented UHAUL truck and tow dolly ($350 US), plus the gas such a vehicle consumes.

Take to NW Indiana garage, and they say,

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Checked from garage that replaced the water pump, and said it was a dealership new waterpump that was installed, with all new gaskets, and did NOT replace timing chain.

Go and talk to dad (aren't dad's great!). Dad has rebuild many motors in his day- was a millright who completly rebuilt from scratch Model A's , 1940's sedans, and some cars in the 1970s and 1980s. Successfully rebuilt 2 automatic transmissions in the 70s and 80s as well. Dad's getting up in age (mid seventies) so didn't want to burdeon him, just wanted his input. He said, consider water pump, but he seemed to remember a test you could do on the coolant to check for exhaust gases. After trips to 4 local Auto parts stores (some "fake" ones like Autozone, and a couple real ones), found a guy who knew of the test, and ordered one for me. So, for $40, hopefully will be able to see if there are exhaust gases in the coolant, indicating a blown head gasket.

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Just trying to explain my overheating issues, and giving some insight into potential causes, and remedies that were explored in my case so they may be of help with you.

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