Bros, why is my daily overheating?
Thread Starter
Joined: Jun 2006
Posts: 29,085
Total Cats: 375
From: Republic of Dallas
Late to the party. Stop guessing if your rad caps are good or not, I've gotten DOA ones from mazda motorpsorts. Put the cap on and squeeze the upper rad hose, if you can hear/see the coolant flowing into the overflow its no good. You have to squeeze really really hard to make it go in with a good cap, don't know if its even possible though, never made coolant go into the overflow with this method on a good cap.
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I have seen the edge of the filler necks on aluminum radiators bent upward slightly keeping the cap from holding rated pressure, though the cap was fine. Just something else to check.
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That might be a good indication.
I've had a case where a hose was deteriorating and it caused blockage. Looked OK from the outside.
Maybe it's time to refresh the rubber? Is it newish?
I've had a case where a hose was deteriorating and it caused blockage. Looked OK from the outside.
Maybe it's time to refresh the rubber? Is it newish?
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Thread Starter
Joined: Jun 2006
Posts: 29,085
Total Cats: 375
From: Republic of Dallas
It was old and it's only 80*f right now so I won't know if that fixed it for a while. It makes sense though, there was negative pressure there so it only leaked after the car stopped and heat-soaked, then pissed water.
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When my lower radiator hose came off the radiator - within 90 seconds of parking the car in the garage after a commute home - it was because the radiator cap wasn't letting the pressure out at all.
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