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01-07-2019, 08:35 AM
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#1
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Registered User
Join Date: Dec 2018
Location: USA
Posts: 242
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Problem with Toad
1-4-19 Hi, I hope you can find the right people to ask about this because it is an:
Automotive mystery I bought a 2000 Chevy Cavalier Z24 (2.4L 100k miles) Ran it for several months and many miles and it ran fine. One day returning from the VA in Orlando on I-4 (150 mile RT) it over heated (#1 steam from under hood) I worried that it was a head gasket so I put Barr stop leak in it. It ran fine for months and suddenly it overheated with steam (#2) so I had a thermostat put in it. It ran fine again for weeks including the hi-way trip to the VA. Then one morning I left my apartment with a cold engine (50s) and drove less than 3 miles, I watched the temp gage as it started moving up (a little faster than normal) it went right past the normal temp and rapidly moved higher, steam from under the hood again (#3). I pulled over, shut the motor off, let it cool for several mins, and when I restarted it the temp gage returned to normal. Today I watched it carefully and it never got above normal.
What could it be ??????????
I have had people say that the new Slant thermo could be bad, check the fan, needs a rad flush, bad water pump, and clogged cat converter.
However it has only happened 3 times in a year and thousands of miles. The last time the engine was stone cold and did it within three miles.
This car runs and handles great so I would like to keep it. 
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01-07-2019, 09:08 AM
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#2
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Senior Member
Join Date: Feb 2015
Location: Huntingtown, MD
Posts: 834
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Fan controller, is the electric fan running when the engine gets hot?
__________________
Earl & Sharon, 2008 Fleetwood Expedition, ISB 6.7
1995 Jeep YJ/2013 Chevy Sonic
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01-08-2019, 06:58 AM
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#3
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Registered User
Join Date: Apr 2018
Posts: 1,459
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How often do you check the coolant level in the radiator? Not the burp tank but the radiator?
Proper function is as coolant warms/expands, it is forced into the tank. Then when you shut it off cools and the vacuum pulls coolant back in the radiator. If you have a small leak you don't have that vacuum, tank can stay full and you run low on coolant...
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01-08-2019, 07:53 AM
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#4
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Member
Join Date: Aug 2016
Posts: 31
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Same thing happened to me.Take out the thermostat and drill 2 small holes in it .It will let the pressure by No steam lock
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01-08-2019, 08:13 AM
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#5
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Registered User
Join Date: Dec 2018
Location: USA
Posts: 242
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Fan
Quote:
Originally Posted by hayward3411
Fan controller, is the electric fan running when the engine gets hot?
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Start cold engine, no fan, turn on AC fan starts, AC off fan stops. Engine up to operating temp no fan. I got it up to full temp and let it idle for some time temp stayed in normal range and no fan.
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01-08-2019, 08:14 AM
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#6
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Registered User
Join Date: Dec 2018
Location: USA
Posts: 242
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Thrmostate
Quote:
Originally Posted by Tjbass1
Same thing happened to me.Take out the thermostat and drill 2 small holes in it .It will let the pressure by No steam lock
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Has anyone else ever tried this trick ??
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01-09-2019, 08:24 AM
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#7
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Registered User
Join Date: Dec 2018
Location: USA
Posts: 242
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Quote:
Originally Posted by ScoobyDoo
How often do you check the coolant level in the radiator? Not the burp tank but the radiator?
Proper function is as coolant warms/expands, it is forced into the tank. Then when you shut it off cools and the vacuum pulls coolant back in the radiator. If you have a small leak you don't have that vacuum, tank can stay full and you run low on coolant...
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No Radiator cap on this model, only expansion tank cap.
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01-09-2019, 09:46 AM
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#8
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Senior Member
Join Date: Nov 2012
Location: Keeseville ny
Posts: 648
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You can buy a thermostat that will do this. It has a little pill that hangs from hole to keep it closed so car will warm up faster.hole opens up under pressure
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01-09-2019, 03:20 PM
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#9
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Senior Member
Monaco Owners Club
Join Date: Sep 2003
Location: Quitman MS
Posts: 2,967
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GEO it sounds like the engine fan thermostat is bad.
__________________
Walt & Will
2000 Dynasty
2017 Ram Big Horn Crew C 4X4 w/ M&G
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01-09-2019, 03:30 PM
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#10
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Senior Member
Monaco Owners Club
Join Date: Oct 2014
Location: Rigby, Idaho
Posts: 3,936
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Squeeze along the length of the lower radiator hose. If the internal spring is partially rotted and gone, the water pump could suck the lower hose flat, cutting off water from the radiator.
__________________
Cheers,
TonyMac
2006 Monaco Safari Cheetah 40PMT
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01-10-2019, 12:08 PM
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#11
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Registered User
Join Date: Dec 2018
Location: USA
Posts: 242
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Quote:
Originally Posted by TonyMac
Squeeze along the length of the lower radiator hose. If the internal spring is partially rotted and gone, the water pump could suck the lower hose flat, cutting off water from the radiator.
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Thanks Tony, I went out, got down, and the bottom hose is very soft. That could explain why it could go for weeks and then happen, then go for many weeks and happen again.  I will change it.
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01-11-2019, 08:48 PM
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#12
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Member
Spartan Chassis Rexhall Owners Group
Join Date: Nov 2017
Location: Whatcom County, WA
Posts: 58
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Old shade tree mechanic trick, drilling a couple holes in the thermostat to let bubbles out when you're filling it up after cooling system work. 
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01-11-2019, 09:29 PM
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#13
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,137
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I think I'd replace both hoses and thermostat plus flush the system twice.
If the original belts are still on it they'd get replaced too.
Better now than when you are on a trip.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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01-18-2019, 08:27 AM
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#14
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Senior Member
Monaco Owners Club
Join Date: Jul 2018
Location: Elizabethtown, Ontario
Posts: 224
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I think you should take it to a licenced mechanic instead of trying everything possible based on suggestions from people on a MH web site.
__________________
40 foot 2002 Monaco Diplomat
2005 Ford Focus to tow around
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