Heater question

Maintenance/Repairs
1

I have a 1995 Winnebago MH with a Ford 7.5L gas engine. traveling in temperatures around 35 degrees the heater was not putting out enough heat - not even real hot. and the faster I went the cooler the heat and the engine temp gauge was. sounds strange I know but is this a thermostat issue or heater core or both? ps: the a/c in summer does not cool either

2 
 I would likely replace the thermostat.  How long has it been since you replaced the coolant?  I would also look for a possible vacuum problem. Is there any history on this vehicle?  How many miles, what kind of care, etc.
3

I don’t know the history - I just purchased the vehicle this summer. the coolant was full and looked clean. 55600 miles and appears to be well maintained

4

Have the cooling system flushed and the thermostat replaced. That will probably solve your heater issues. The AC problem is probably caused be a leak. Take the vehicle to an AC shop and let them fix it.

The heat and AC systems are separate. A problem with one does not necessarily relate to a problem with the other.

5

thanks for your help - I will git r done