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Bad coolant w/ leaks from many places, overheated and shut off, heater doesnt blow heat anymore

Tightened everything and fixed the leaks, filled with water only and ran through the system and checked for leaks, no leaks, drained and filled with coolant and water not 50/50. doesn't overheat anymore but heater does not blow hot air after 15 mins. or so

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  • Cars & Trucks Master
  • 5,371 Answers

After the engine has reached normal operating temperature, feel both heater hoses going into the firewall. Are both hot? If both are hot, it's probably the door or doors in the heater case not operating from the selector knob on the dash. If only one hose is hot, the coolant is not circulating through the heater core. Look for a water valve in the hoses that is shut. If no valve, crack open the cold line to see if you can start circulation through the core. If neither hose is hot, pull off the inlet to the heater core (it may come from the cylinder head area) and run the engine and check stream flow. It won't spurt out like a garden hose, it should flow out in a smooth even stream, maybe just enough pressure to push a steady stream. If no flow comes out, coolant is low, or there is a circulation problem in the engine, like a kinked hose, a weak water pump...
Does the radiator cap hold pressure in the cooling system?

Posted on Feb 08, 2014

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Posted on Jan 02, 2017

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  • 135 Answers

SOURCE: 91 toyota 4x4 22re overheats on highway, but not at idle.

original issue sounded like thermostat but now that you have lost power i would have to say thermostat, blown head gasket, and warped head

to check thermostat find and remove place in pot of boiling water the see if it opens, then to ice water to check if closes.


the only way i know to check headgasket and head is to check oil and water. oil will have water in it, and water iw have oil in it

Posted on May 04, 2009

cj2176
  • 520 Answers

SOURCE: Prizm overheats, heater core leaks, no heat

You can bypass the core or fix it that's up to you but I would change or remove the thermostat first. If it still overheats then start looking at the water pump and radiator. Hope this helps. Good luck.

Posted on Jun 09, 2009

bunnydawg
  • 5158 Answers

SOURCE: 2000 Xterra intermentantly overheats

sounds more like the thermostat may be failing. generally a water pump starts leaking out of the "weep" hole in the casting before it quits. just look at the front of the water pump for a greenish streak or an obvious leak.
if you also suspect you heater core may be getting plugged now would be a good time to back flush it to get rid of some of the gunk.

Posted on Oct 22, 2009

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Sounds like you have a leak somewhere. A good place to check first is the heater core. It is on the passenger side under the dash. Check the floor carpet and under the carpet if it is wet or any signs of antifreeze. If so than your heater core is leaking, and since you don't have heat it is of course broken. This could also the the reason why you have bubbly coolant, with air leaking into the system.

I would start with that.

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