Does a radiator build up natural pressure after cooling overnight?

Asked by May 29, 2015 at 02:19 PM about the 2002 Toyota Tundra 4 Dr Limited V8 Extended Cab SB

Question type: Maintenance & Repair

Having replaced my radiator 5 days ago, I check it constantly now after the engine cools. During day usage, I
do a quick look and notice that the overflow reservoir coolant level rises a little above F. Before driving this
morning, the reservoir was right at F. Opening the radiator cap released a little pressure and the coolant was
up to the neck. Is everything normal? Having done this replacement myself I want to be sure. Thanks for

2 Answers


Yes, that's fine. As the coolant get's hot and expands, any excess will purge itself back into the jug causing it to rise. As it cools and everything contracts, it will suck coolant back in from the bottle. As long as your temp gauge stays in the normal range, everything should be good.

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Absolutely. When the coolant gets hot it expands. Some coolant is forced into the plastic recovery tank so the level rises. When the engine cools the coolant contracts and coolant is pulled back into the radiator. What you're seeing and hearing is perfectly normal. Good job on the radiator replacement!! HTH. -Jim

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