heater core

[werty2u]

any info on how to replace thr heater core in a 1991 mazda 626 would be
ever so GRATE-FULL

[fredjacksonsan]

Hey werty-- try posting your question in the correct forum, and you'll get a bit more help. Go to this link:

http://www.automotiveforums.com/vbul...play.php?f=294

Generally, the heater core is an underdash or dash removal job, unless there's an access plate on the firewall. Good luck finding your answer.

[onesimusmo]

Originally Posted by werty2u

any info on how to replace thr heater core in a 1991 mazda 626 would be
ever so GRATE-FULL

If the heater core is just clogged and not leaking, a simple fix that has worked for me consistently is to switch the inlet and outlet hoses on the firewall. The clogging is from constant one-way directional buildup of sediment and is often made worse or complete if you have added any radiator stopleak. By reversing the hoses you create a back-flush action that forces everything back into the general cooling system. If this works for you make sure to do a general cooling system flush afterwards so the same crud doesn't redeposit itself over time.

[fredjacksonsan]

Originally Posted by onesimusmo

If the heater core is just clogged and not leaking, a simple fix that has worked for me consistently is to switch the inlet and outlet hoses on the firewall. The clogging is from constant one-way directional buildup of sediment and is often made worse or complete if you have added any radiator stopleak. By reversing the hoses you create a back-flush action that forces everything back into the general cooling system. If this works for you make sure to do a general cooling system flush afterwards so the same crud doesn't redeposit itself over time.

Why not just run a hose in the reverse direction? No sense putting all that crap into your engine.....just my