Top hose hot...bottom hose cold

Gossamer · Feb 15, 2018

Just changed thermostat.
Top hose is hot....heater hoses are hot...but bottom hose to radiator is cold.
Does this indicate air pocket or water pump?
Water pump changed 1 year ago and I purged the system of air.
No pressure building in resevoir....heater blowing hot.
No noise or leaks from water pump.
Gets up to 235-240 degrees then goes back to under 210.

Possibly clogged up radiator....flush?

Thanks

Gossamer · Feb 15, 2018

See above.....
No pressure is building up in the reservoir at all. Heater is blowing hot.
No noise or leaks from water pump

RED TAHOE LS · Feb 16, 2018

Replace radiator, you'll be good to go. AC Delco parts store carry replacement with great warranty for just over $120.00, don't make the mistake like so many have. JMHO. My original one lasted close to 175k, l/side tank cracked.
David g...............

JonnyTahoe · Feb 17, 2018

what year is your truck ? Whats the outside temp ?

Gossamer · Feb 21, 2018

jonnytahoe said:
what year is your truck ? Whats the outside temp ?

it is a 2002 5.3
Outside temp varies 35 degrees to 60 degrees

JonnyTahoe · Feb 21, 2018

Lower hose can take a while to get warm or hot.

Top hose hot...bottom hose cold

Gossamer

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