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V4saab1966
V4 Fanatic

United Kingdom
255 Posts

Posted - 28 Jun 2019 :  23:22:49 Show Profile Reply with Quote
My 1967 Saab V4 has a issue when it’s hot , when you turn off the car there is a bubbling sound then the water leaks out the overflow pipe by the Radiator cap, car runs at normal temperature and cooling system is full, it’s had in the past new radiator and new water pump, can not seem to understand why it does this ?? Any one else had this issue?this is the early rad wit no expansion tank on the side of it .

Derek
V4 Guru

United Kingdom
2191 Posts

Posted - 30 Jun 2019 :  22:39:00 Show Profile Reply with Quote
New cap needed with good rubber seal ring or the cap is too short a reach.
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stevebod
V4 Fanatic

United Kingdom
416 Posts

Posted - 01 Jul 2019 :  11:56:23 Show Profile Reply with Quote
Agree with Derek.
I think when you turn the engine off the engine actually gets hotter for a short time because water is no longer circulating. With a loose radiator cap this can cause loss of water.
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V4saab1966
V4 Fanatic

United Kingdom
255 Posts

Posted - 02 Jul 2019 :  01:15:46 Show Profile Reply with Quote
I will try a new cap and thermostat but this car has the early rad in it not the later type with the expansion tank I’ll keep you posted
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RhysN
V4 Fanatic

United Kingdom
411 Posts

Posted - 02 Jul 2019 :  06:34:17 Show Profile Reply with Quote
You are not over filling? If the water is to the top it has to expand when hot and some has to go somewhere?
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Derek
V4 Guru

United Kingdom
2191 Posts

Posted - 02 Jul 2019 :  10:34:58 Show Profile Reply with Quote
quote:
Originally posted by RhysN
You are not overfilling? If the water is to the top it has to expand when hot and some has to go somewhere?


+1 to that. Leave space for at least half a litre of coolant. If you do that you may not need the new cap or thermostat. New cap easy if it looks suspect. Soak thermostat cover nuts/bolts with penetrant a few times before trying to remove them if you've not had them off recently. Snapping off the studs is not unusual.
Edited by - Derek on 02 Jul 2019 10:40:33
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melle
V4 Guru

United Kingdom
3833 Posts

Posted - 02 Jul 2019 :  13:20:44 Show Profile Reply with Quote
Replace the thermostat cover bolts with studs and nuts while you're at it.

www.saabv4.com
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V4saab1966
V4 Fanatic

United Kingdom
255 Posts

Posted - 03 Jul 2019 :  01:09:44 Show Profile Reply with Quote
No not overfilling it the thermostat is faulty replaced the cap as well now it’s ok
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