the heat in this car sucks and im not sure why, yet. im going to see if the dealer will look at it while its still under warranty. i dont know if they used a 165 degree thermostat or if the diverter valve isnt opening all of the way, or if the heater core is plugged up. other than that, this car now runs awesome. i love the fuel mileage, for larger car they are really great on gas.

Is the blower fan iworking properly (lo med hi) and diverting air to where you want it (windshield, floor, dash)? Where is the coolant level? Is the overflow tank full? Low coolant can starve a heater core. Check the coolant in the morning before the car has been started by opening the radiator. The coolant should be to the top of the radiator. The overflow tank should be at the cold line. When you have confirmed the coolant level is up, and after the car has warmed up, (top radiator hose should be hot) check the temperature of the two hoses going to and from the heater core. If the heater core is plugged up solid, both hoses will be cool, the one from the engine to the core a little warmer near the engine. If the heater core is almost completely plugged, there will be a big difference in the temperature of the hoses - inlet hot, return much cooler. If both heater hoses are hot, that suggests that hot coolant is flowing through the core and that the problem is that the ductwork is not allowing air to flow through the heater core and into the cabin. If you have one or can borrow one, an infrared thermometer is really helpful for checking temperatures of hoses in the engine compartment. If you have to check them by feel, it is probably a good idea to do so quickly after you have shut the engine down. Fixing human bodies is much more costly than replacing heater cores.

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1998 3.8 Dodge Caravan 214K
2000 3.3 Dodge Caravan 175K
1949 Plymouth Special Deluxe 4-dr sedan 25K (needs some work!)

my 87's heat was sorta weak a few months back, i cleaned the evap core and that solved my probs.

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"CERTIFIED BONNIEHOLIC"
B I-1999 Bonneville SE -My First Bonnie- gone forever
B II-2000 Bonneville SSEi (black) 7/3/09 ZZpcm 1.0, Thrasher Cold Air Intake, Magnaflow hi-flow cat, 180 thermostat, Autolite 104's, solid hockey puck front mount, Intense 3.4 MPS. (OCT 2010 COTM Nominee)
B III-1987 Bonneville LE (burgundy) 7/22/10 -- Gone to Heaven
B IV-1991 Bonneville LE (black) 12/6/12 Parts Car -- Gone!
B V-1998 Bonneville SE (green) 9/11/13 -- 270,000+ and going strong! -- gone 287k+
B VI-1989 Bonneville SSE(gray)9/23/15

Techinfo is your friend. Link at the top of the page:

http://www.pontiacbonnevilleclub.com/fo ... =45&t=2432
There are many more articles there that can help you. Take the time to browse through them.

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Click here for mod list for both cars
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