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  87 Fiero L4 - Car overheats with thermoststat in place, no flow to radiator

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87 Fiero L4 - Car overheats with thermoststat in place, no flow to radiator by z1motorcars
Started on: 11-24-2013 11:58 AM
Replies: 7 (141 views)
Last post by: katatak on 11-24-2013 08:45 PM
z1motorcars
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Report this Post11-24-2013 11:58 AM Click Here to See the Profile for z1motorcarsClick Here to Email z1motorcarsSend a Private Message to z1motorcarsEdit/Delete MessageReply w/QuoteDirect Link to This Post
87 Fiero L4. I've tried two different Stant 180 degree thermostats. With the thermostat in place the temperature will rise quickly and the car will overheat. The radiator hose is cold, the hose in the rear of the car by the thermostat housing is really hot. I've bled the system a couple of times. If I remove the thermostat the problem seems to go away. In regular driving the car may reach 220, fan kicks in and temperature drops immediately. Any ideas? Thanks to all.

Bernie
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Midn1ght Driv3r
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Report this Post11-24-2013 01:53 PM Click Here to See the Profile for Midn1ght Driv3rClick Here to Email Midn1ght Driv3rSend a Private Message to Midn1ght Driv3rEdit/Delete MessageReply w/QuoteDirect Link to This Post
I was having the same kind of issue recently. Kept replacing the thermostat, and it still wouldn't kick on when it should have. My issue was that the gauge was reading incorrectly as it does for a lot of people here. I'm not sure how accurate yours is but that's what was wrong with mine at least. Is the temperature light turning on?
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z1motorcars
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Report this Post11-24-2013 02:01 PM Click Here to See the Profile for z1motorcarsClick Here to Email z1motorcarsSend a Private Message to z1motorcarsEdit/Delete MessageReply w/QuoteDirect Link to This Post
It did come close to overheating once, light came on but a hose had come loose. The main problem is with the thermostat in place there doesn't seem to be a flow from the rear of the car to the radiator. The hose by the thermostat housing is 'hot', the hose by the radiator is 'cold'. If I take the thermostat out both hoses get warm.

Thanks for the response,

Bernie
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Gall757
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Report this Post11-24-2013 03:01 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
It is possible that the water pump impeller has detached from the shaft and is not spinning much. The symptoms you have would point in that direction, but it is a rare failure.
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z1motorcars
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Report this Post11-24-2013 03:05 PM Click Here to See the Profile for z1motorcarsClick Here to Email z1motorcarsSend a Private Message to z1motorcarsEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks, I just replaced the water pump, tensioner and serpentine belt. No leaks, tough to get the tensioner in .. but .. all went well.

Without the thermostat there doesn't seem to be any problem with circulation.

Bernie
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Blacktree
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Report this Post11-24-2013 04:04 PM Click Here to See the Profile for BlacktreeClick Here to visit Blacktree's HomePageClick Here to Email BlacktreeSend a Private Message to BlacktreeEdit/Delete MessageReply w/QuoteDirect Link to This Post
I'd be tempted to drop both thermostats into a pot of boiling water, and see if they open.
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z1motorcars
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Report this Post11-24-2013 05:56 PM Click Here to See the Profile for z1motorcarsClick Here to Email z1motorcarsSend a Private Message to z1motorcarsEdit/Delete MessageReply w/QuoteDirect Link to This Post
Good idea, thanks.
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katatak
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Report this Post11-24-2013 08:45 PM Click Here to See the Profile for katatakSend a Private Message to katatakEdit/Delete MessageReply w/QuoteDirect Link to This Post
Are your coolant tubes "crushed"?
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