I just bought my '89 Isuzu Trooper (2.6L 4cyl.) as a project for and my son
and I. It is now winter time and I just tried to run the heater, and no
heat (air is blowing fine). We replaced the thermostat, and flushed the
system, but no joy.
Not looking forward to replacing the heater core (assuming that is the right
course of action) - does anyone have any suggestions?
schmen and son
Get cooling-system cleaner at your car parts store.
Add it to the sytem. Follow the instructions that go with it.
While idling the engine with the cleaner make sure the heater is turned
Drain the system and fill it up with new coolant.
b.t.w. I have the same problem with mine. Did not try to clean it yet.
Enough cooling liquid in the system? (Level)
Check for air also.
Engine does not run hot ?
No leakage anywhere?
Heater core can be blocked by dirt inside....
Thanks for all the suggestions...
- The fan is working fine.
- There is no leak
- The engine is not running hot
- The water pump does seem to be ok - the fluid appears to be circulating.
From the suggestions made so far, I'm guessing that it is either the core,
or possibly the cable running to the temperature control. Any suggestions
as to how I could test if it is the cable slipping (maybe manually adjusting
the valve, wherever that may be)?
Just look under the dash.
Move the lever on the dash. Now you can see what actually has to move.
b.t.w. Left side of the dash.
Cable broken or came loose ? Is also possible.
If so, move the lever underneath by hand.
Heating must work o.k. then.
Otherwise, clean the core inside.
has someone replace the hoses to the heater if so maybe there on
backewards with the engine on and hot feel the hoses if one is hot and
the other is cold that is your problem reverse them if not then
check you temp control cable
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