No coolant to the engine - why?
Thread Starter
Instructor
Joined: Jun 2018
Posts: 151
Likes: 4
No coolant to the engine - why?
I just finished a head gasket job on my 89. Started up and ran just fine, but coolant temp quickly went to 200+ I shut the engine down and felt the radiator hoses. they were not warm. So I am thinking stuck thermostat, but it is new and best I could find. I drained the radiator, about 1/2 gallon drained out (radiator was full when I started the car). The radiator took only 1/2 gallon to fill up. Maybe my radiator is clogged? I did use head gasket sealant in the engine before the head repair. So...first, how much should the radiator hold? What would cause it to take 1/2 gallon? Any insights on replacing the radiator? thanks, you guys got me this far!
Le Mans Master
Joined: Aug 2017
Posts: 6,942
Likes: 1,490
From: New Jersey
At half a gallon there is either a gigantic air pocket somewhere or it could be clogged like you speculate. When I fill mine I usually end up massaging the hoses to get it to burp out the air. I haven't experienced a clogged radiator before so I don't really know how to check for one though...
Safety Car
Joined: Sep 2001
Posts: 4,157
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From: Glenbeulah Wi
No water in the block, pull the thermostat fill the radiator until you see water at the top of the thermostat housing. Then put the thermostat back in and fill the radiator full. Also drill a 3/16 hole in the thermostat flat surface to purge out trapped air while the car is warming up. Car should take around 3 gallons to fill.
You can also start the car and while it is idlng add coolant to the radiator until it is full and then put the cap back on. Obviously do this while the engine is still cold.
You can also start the car and while it is idlng add coolant to the radiator until it is full and then put the cap back on. Obviously do this while the engine is still cold.
Last edited by bjankuski; Mar 9, 2019 at 08:16 AM.
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
No water in the block, pull the thermostat fill the radiator until you see water at the top of the thermostat housing. Then put the thermostat back in and fill the radiator full. Also drill a 3/16 hole in the thermostat flat surface to purge out trapped air while the car is warming up. Car should take around 3 gallons to fill.
You can also start the car and while it is idlng add coolant to the radiator until it is full and then put the cap back on. Obviously do this while the engine is still cold.
You can also start the car and while it is idlng add coolant to the radiator until it is full and then put the cap back on. Obviously do this while the engine is still cold.
the thermostat can't open if there is no coolant below it. A half gallon fills only the radiator.
Thread Starter
Instructor
Joined: Jun 2018
Posts: 151
Likes: 4
When you say..."You can also start the car and while it is idling add coolant to the radiator until it is full and then put the cap back on. Obviously, do this while the engine is still cold......would this be done without removing the thermostat?
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
You could try that, and see if it works.
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Heel & Toe
Joined: May 2018
Posts: 17
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Your hose from the passenger side top of the radiator that goes to the surge tank is prolly clogged.
Literally just spent a week or trying to figure this exact prob out on my new project. Which just had HG's done as well.
Good luck!
Literally just spent a week or trying to figure this exact prob out on my new project. Which just had HG's done as well.
Good luck!
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
I've got a question that may contribute to the OP's issue. On my '89 (which is the Kart, now), my radiator cap is lower than the T-stat housing and lower intake. That being the case, I can't see how it's possible to fill the system with the car sitting on level ground. Can anyone else?
I jack my car's front end about 2' off the ground to get the radiator fill above the t-stat, hoses and intake...then I fill it and end up with no air in the system on the first try. Short of that, IDK how you'd fill an '89 and not still have air in it.
.
I jack my car's front end about 2' off the ground to get the radiator fill above the t-stat, hoses and intake...then I fill it and end up with no air in the system on the first try. Short of that, IDK how you'd fill an '89 and not still have air in it.
.
Last edited by Tom400CFI; Mar 10, 2019 at 02:45 PM.
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
When refilling the coolant system on my '88 I warm the engine with cap off.
When I see coolant flowing I add fluid and blip the throttle (carefully of course) to "burp" the system of air.
When coolant level doesn't drop install the cap and done.
When I see coolant flowing I add fluid and blip the throttle (carefully of course) to "burp" the system of air.
When coolant level doesn't drop install the cap and done.
Le Mans Master
Joined: Aug 2017
Posts: 6,942
Likes: 1,490
From: New Jersey
I've got a question that may contribute to the OP's issue. On my '89 (which is the Kart, now), my radiator cap is lower than the T-stat housing and lower intake. That being the case, I can't see how it's possible to fill the system with the car sitting on level ground. Can anyone else?
I jack my car's front end about 2' off the ground to get the radiator fill above the t-stat, hoses and intake...then I fill it and end up with no air in the system on the first try. Short of that, IDK how you'd fill an '89 and not still have air in it.
.
I jack my car's front end about 2' off the ground to get the radiator fill above the t-stat, hoses and intake...then I fill it and end up with no air in the system on the first try. Short of that, IDK how you'd fill an '89 and not still have air in it.
.
And if you bring up the rpms a little with the stat open, all the air will be forced into the radiator anyway in my experience. My garage is level, so that's how I know it can be done.
Oil Producer
Joined: Apr 2014
Posts: 9,374
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and as dogs says u could put a 1/8th hole in the flange of the tstat. that works. to make it even quicket yet, do as tom says and jack the front passenger side.
and u need to ensure the cap is sealing. and that the overflow hose isnt cracked or comprimised. or plugged.
if u need to clean inside of your overflow tank here is my trick ive used on three early c4’s. grab a few handfulls of playground gravel. no debris just stones. the more angular the better. put them in the tank with hot soapy water and start shaking. tank comes out like new. gets ride of the all-too-common staining from either rust or even more common bars leak residue!!!
good luck.