Question about 1990 Mazda 626

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95 Mazda 626 keeps blowing heater hoses, between thermo.& firewal

? bad thermostat ? , heater core? Or What ?

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Sounds like a clogged radiator

Posted on Dec 28, 2008


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98 ford ranger no heat have changed thermostat water pump heater control valve

Maybe the heater core is plugged or you haven't bled it properly?
If the heater hose returning from the core to the water pump is NOT hot, while the hose going to the heater core from the thermostat area IS hot, then the heater core is plugged probably.
You need to remove the heater hose while cool,from the thermostat area and remove the hose from the water pump area (that's the outlet of the flow thru heater core) AND THEN take a garden hose with p-is-tol grip type sprayer,and blow water back thru the outlet hose out the inlet hose. This will blow any bad plugging material out the way it got in.
Don't apply too much pressure if it is plugged bad. The heater core isn't made to stand 50lbs. water pressure. don-ohio (:^)

Dec 31, 2016 | 1998 Ford Ranger

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You might have a bad thermostat, you might just be low on coolant, and check the actual radiator, not the plastic overflow tank. If both of those are fine, you could have a restricted heater core, you can check that by touching both heater core hoses, if one hose is hot and the other isn't, then it's clogged.

Feb 18, 2015 | 1996 Mazda MPV

1 Answer

My 05 Mazda Tribute blows cold air when idleing, I have flushed the radiator, flushed the heater core and, replaced the thermostat. Don't know what else to do.

the switching switch for your heater hose is bad its a valve hooked into the hose near the fire wall of car replace it

Dec 17, 2014 | 2005 Nissan Maxima

1 Answer

95 Fleetwood Cadillac no heat changed water pump and thermostat. The heater core is not bypassed and car stays defrosted help me see why no heat is blowing out. The fan works but no heat

Sounds like a air lock in interior heater core, remove one heater hose under hood and make sure you have flow through heater core. Some vehicles have a valve that controls coolant flow through heater, check on hose for that if no coolant comming out of inter heater hoses.

Nov 30, 2013 | Cars & Trucks

1 Answer

Heater problem 1999 Mazda 626

under the dash board on the passenger side is where the heater core is located anything associated with the blend doorwould also be located there as well.

Feb 12, 2012 | 1999 Mazda 626

1 Answer

My heater only blows out cool air even when motor is hot. Fluids are full. Going to try to change out thermostat just need to know where its located.

you can change the thermostat. there are two hoses coming off the radiattor. one goes to the heatere core and to the engine block. the one to the block has the thermostat. take the old thermo and boil it in water. if it open up it is not the thermo. the next likely reason is th heater core. Please let me know

Jun 20, 2010 | Cars & Trucks

2 Answers

I have an antifreeze leak in the back part of my 93 mazda 626 and it is not the hoses going to heater core. I've replace dboth hoses and still have severe leak.

maybe its leaking else where and follow on a channel or something and then leaking out the back you need to start it and watch it while running check ur thermostat housing,water pump,

Nov 24, 2009 | 1993 Mazda 626

1 Answer

Heater blows cold at idle 2002 626 V6

thermo s stuck open n or maybe the bypass ... not too expensive to fix

Oct 23, 2008 | 2002 Mazda 626

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