Question about 2009 Jeep Patriot

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2009 jeep patriot 2.4 heater not blowing hot - 2009 Jeep Patriot

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Hello Greg
your post invites wild guessing. do to lack of facts.
sure no coolant, sure look,sure cap of rad , cold look, is it full.
1: are the fuses ok, we test them.
2: doed the blower blow air? on high. y/n. my wild guess yes.
3: no heat, on heat max and set to recirc,
4: next is engine heat ,it must be 180f +, or that is it. or more.
5: #4 passes ,then we next (SM steps here , read them) you next
check the to 2 heater core hoses, as they pass from BAY to CAB.
at the fire wall. in use, right side.
the SM again, tells you the correct temp, here, 125 to 144f
depends on engine, there. not stated. (my 3.7L does 144f)

6: if both are hot, (we do a hand test, ('skills") some use and IR thermal gun?a $19 tool.
if ok then the dampers in core heater box, are stuck closed.
7: did you scan the PCM for HVAC errors yet?
some will report ,damper motor errors....
some jeeps have HVAC self test, stated in the SM
the Jeep offical, service manual, got one?
if not ,get car serviced, at stage where dampers failed.

Posted on Dec 17, 2016

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Radiator coolant level may be low.

Posted on Dec 17, 2016


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id the dampers fail , its not in heat mode.
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1 Answer

2009 jeep patriot not heating up properly

its a heat exhanger.
1: the water is not 180F or more.
2: the water is not flowing through the core
3: or the air cant pass through the core.
bad water temp,. bad flows, or the damper is in the wrong position.

i plug in my scan tool and the ECT reads 180f or more. holding
cool real hot water.
i then feel both water lines to the core (dial set to hot)
both are hot, if not , the core is plugged or the water valve (if present)
is clogged.
ok both lines 180f roasting hot, finger test or better IR pyro gun.,
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if the core is hot, we check damper controls
there are 3 systems, and some cars have a mix
open FSM to HVAC section,, bingo there you go...
cable, vacuum servo and damper motors.
some are a mix. min 04 is mix. my jeep 08 is vacuum
my 96 is cables.
id dont matter,. there is a simple test for each
the motor kind are the hair pulling kind, (invisible)

i went online
the patriot has at least 2 cables, blend./temp, and mode
so there is water valve, so he damper if open on temp you get
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1 Answer

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Go To your local Firestone store located on 1802 state st. Erie,PA

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