Overheating Issue
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Many subjects will have been discussed before. Please try the search function before starting a new thread.
Check in the Know Your 2 as the information you need may already be there.
Important ! - Please make your topic title as descriptive as possible . titles with just "help" generally dont get as many answers as a title that points to the problem
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Topic author - Posts: 1011
- Joined: 21/06/09 21:07
- Years of MR2 Ownership: 7
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- Location: Swindon, Wilts
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Overheating Issue
I'm having an odd overheating issue, this only occurs after using the car hard on track.
Rev 1 N/A, cambelt, water pump & coolant changed circa 1500 miles ago. New thermostat in the last 5-700 miles with perfect running on the road.
After running on track today the car got hot, the pipe to the radiator was very hot, the pipe back to the engine was cold. The radiator was also cold. What cause this to occur?
When the car was left to cool and then driven normally on the road the temperature dropped down to normal and both sides of the radiator were warm as expected.
The issue is intermittent and has occurred on a few track days but only once on the road (thermostat fixed that issue as it was running perfectly afterwards).
Is there any reason why something like this would only occur after hard track use?
The radiator is in very good condition with no fins missing.
Oh and I should add that when it got hot it puked so e coolant out of the expansion tank.
Rev 1 N/A, cambelt, water pump & coolant changed circa 1500 miles ago. New thermostat in the last 5-700 miles with perfect running on the road.
After running on track today the car got hot, the pipe to the radiator was very hot, the pipe back to the engine was cold. The radiator was also cold. What cause this to occur?
When the car was left to cool and then driven normally on the road the temperature dropped down to normal and both sides of the radiator were warm as expected.
The issue is intermittent and has occurred on a few track days but only once on the road (thermostat fixed that issue as it was running perfectly afterwards).
Is there any reason why something like this would only occur after hard track use?
The radiator is in very good condition with no fins missing.
Oh and I should add that when it got hot it puked so e coolant out of the expansion tank.
Rev 3 N/A - RIP :(
Rev 2 Turbo - Sold :(
Rev 1 N/A - Road Legal Track Car
Rev 1 V6 - Co-owned side project
Rev 2 Turbo - Sold :(
Rev 1 N/A - Road Legal Track Car
Rev 1 V6 - Co-owned side project
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- Administrator
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Re: Overheating Issue
Sounds like you have air in the cooling system, is the pressure cap in good condition? Also is the expansion tank cap and the pipe to it in good condition?
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Topic author - Posts: 1011
- Joined: 21/06/09 21:07
- Years of MR2 Ownership: 7
- MR2's Owned: 3
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- Location: Swindon, Wilts
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Re: Overheating Issue
I've ordered a new pressure cap as it seems to be original and the bottom part of the valve was quite loose, and will try bleeding the system.
Rev 3 N/A - RIP :(
Rev 2 Turbo - Sold :(
Rev 1 N/A - Road Legal Track Car
Rev 1 V6 - Co-owned side project
Rev 2 Turbo - Sold :(
Rev 1 N/A - Road Legal Track Car
Rev 1 V6 - Co-owned side project
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Re: Overheating Issue
Was it a genuine Toyota t stat?
Fitted with the joggle valve up?
Fitted with the joggle valve up?
1991 rev 1 T Bar n/a 3sge import. A work in progress!!!
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Topic author - Posts: 1011
- Joined: 21/06/09 21:07
- Years of MR2 Ownership: 7
- MR2's Owned: 3
- Gender: Male
- Location: Swindon, Wilts
- Been thanked: 2 times
Re: Overheating Issue
Yes, genuine thermostat from MR2 Ben and I made sure the jiggle pin was in the correct position.
It'll happily drive for hundreds of miles on the road with no problems. It's only after a few hard track sessions when the issue arises.
I'll be fitting a new pressure cap and bleeding the system on the weekend. Next track day is next week so will see if it makes any difference.
Rev 3 N/A - RIP :(
Rev 2 Turbo - Sold :(
Rev 1 N/A - Road Legal Track Car
Rev 1 V6 - Co-owned side project
Rev 2 Turbo - Sold :(
Rev 1 N/A - Road Legal Track Car
Rev 1 V6 - Co-owned side project
-
Topic author - Posts: 1011
- Joined: 21/06/09 21:07
- Years of MR2 Ownership: 7
- MR2's Owned: 3
- Gender: Male
- Location: Swindon, Wilts
- Been thanked: 2 times
Re: Overheating Issue
I think I've solved this. After fitting a new pressure cap and topping up the coolant, it became apparent the bleed valve on the radiator wasn't sealing properly.
This was causing a minor leak/allowing air into the radiator on cool down and I suspect this caused a small airlock in inlet of the radiator causing it to back up to the engine and ultimately out of the expansion tank when hot.
A pair of O rings later and it seems to have solved the issue.
This was causing a minor leak/allowing air into the radiator on cool down and I suspect this caused a small airlock in inlet of the radiator causing it to back up to the engine and ultimately out of the expansion tank when hot.
A pair of O rings later and it seems to have solved the issue.
Rev 3 N/A - RIP :(
Rev 2 Turbo - Sold :(
Rev 1 N/A - Road Legal Track Car
Rev 1 V6 - Co-owned side project
Rev 2 Turbo - Sold :(
Rev 1 N/A - Road Legal Track Car
Rev 1 V6 - Co-owned side project
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- Administrator
- Posts: 5168
- Joined: 17/05/04 1:00
- Years of MR2 Ownership: 18
- MR2's Owned: 1
- Gender: Male
- Location: Glenrothes: The Kingdom of Fife
- Has thanked: 45 times
- Been thanked: 116 times
- Contact: