Coolant Overflow Issue After Intake Install

88scar50 · Apr 8, 2016

I just got done installing a 93 cobra intake. Everything seemed like it went well but after a short test drive the engine started smoking a bit, After a quick inspection it seems that coolant is coming out under the cap of overflow reservoir. I figured maybe it was a bubble and raised the car and let it run for a while with the cap open then topped it off. Same thing happened. What's the deal?

stykthyn · Apr 8, 2016

how long did you let it run? Did you run the heater as well?

88scar50 · Apr 9, 2016

Around 10-15 minutes, heater was on

mikestang63 · Apr 9, 2016

air in the system

88scar50 · Apr 9, 2016

Any Idea how to fix this? Could it be a thermostat issue?

mikestang63 · Apr 9, 2016

http://www.stangnet.com/mustang-forums/threads/bleeding-air-out-of-cooling-system.574770/

88scar50 · Apr 9, 2016

I have tried both the ways already and it didn't resolve the issue

88scar50 · Apr 10, 2016

Gave it another shot. Jacked it up let it run for a while until I didn't see any bubbles then topped it off, then took it for a drive. About five minutes in I pulled over to check it and same thing, bubbling/boiling in reservoir and coming out of the overflow. Cleaning this coolant from the battery tray and continuing to buy more coolant is getting real annoying, any other suggestions for this stupid issue?

jrichker · Apr 10, 2016

Possible leak between the coolant passages on the throttle body spacer and the EGR passages. You get to bypass the coolant by using a piece of copper tubing to join the two small coolant lines. That will hold you until you decide to take the throttle body spacer off and replace both gaskets. While you have the throttle body off, check it for cracks, corrosion or damage to the throttle body passages and gasket surfaces.

Note the two small hoses on the throttle body; they are the coolant lines I was talking about.
Diagrams courtesy of Tmoss & Stang&2birds

88scar50 · Apr 10, 2016

I have the cobra intake which doesn't use the Egr spacer anymore, so those hoses are already connected together.

jrichker · Apr 10, 2016

Good, then keep looking. You need to find someplace where exhaust and engine coolant are in close proximity to each other. There are test kits that indicate exhaust leaks into the coolant.

A Google search turned up this gem ... http://www.autozone.com/repairinfo/...wTo&pageId= 0996b43f80a01231&subtitle=inspect

Even better is this YouTube video...

View: https://www.youtube.com/watch?v=a3J00_e7fyo

88scar50 · Apr 15, 2016

After reading every post and thread I could find, changed out the thermostat again to the stock one and changed rad cap. No change, still doing it. This is getting very frustrating. Any other suggestions?

jrichker · Apr 15, 2016

88scar50 said:
After reading every post and thread I could find, changed out the thermostat again to the stock one and changed rad cap. No change, still doing it. This is getting very frustrating. Any other suggestions?

Did you do the tests I posted for checking the coolant for a combustion leak?

88scar50 · Apr 21, 2016

I think that the problem has been resolved. I changed the fan clutch and haven't had the issue happen again yet.

Coolant Overflow Issue After Intake Install

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