1999 Plymouth Voyager intermittent heat

[quote:500b8ecf47="Scl65"]Heater problem
1999 Plymouth Voyager 4 cyl Front Wheel Drive Automatic 80000 miles
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I only have heat when the engine is at a speeds above idle. I had the cooling system professionally flushed, and the themostat changed. The temp. guage is always in the normal range (once engine is warmed up) and very seldom strays either side of center. My mechanic told me he has good reason to believe my head gasket is blown, because he sees excessive bubbles in the coolant. Couldn't that also be a water pump going bad ? I don't want to spend a bunch of money on a head gasket repair if it's only a water pump.[/quote:500b8ecf47]


they can do a head gasket test
check water pump and coolant flow
also flush heater core:

Engine cool
lower the coolant level
Locate the two hoses running to the heater core
disconnect them at the engine side leaving hoses connected to heater core throw the firewall
use garden water hose and compressed air if possible
run the water and follow by air throw one side and out the other and vice versa
do that two to three times watching what leaving the heater core you are looking for the good flow and clear water to run throw
good luck
let me know